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1 active weather alert

  • Frost Advisory

    Starts in 8 h 38 min

    When
    From 1 AM to 9 AM PDT Saturday.
    Where
    Del Norte and Northern Humboldt Coast. This is expected to be mainly away from the immediate coast and in areas that go calm.

    Issued for this forecast zone · National Weather Service Eureka CA

    What, impacts and precautions

    What

    Temperatures as low as 34 will result in frost formation.

    Impacts

    Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

    Precautionary actions

    Take steps now to protect tender plants from the cold.

    Areas: Coastal Del Norte; Northern Coastal Humboldt

    See it on weather.gov (opens in a new tab)

Observed 3:55 PM PDT at KACV

Arcata, CA weather

Rainy and 59°15°.

Today: low 36°2° (likely 36°2° to 46°8°), high 57°14° (likely 57°14° to 59°15°).

Mostly agree

Now 59°15°

Rain

Wind
14 mph23 km/hgusts 21 mph34 km/h
From the north-northwest. Up to 14 mph23 km/h through 4 AM
Dew point
43°6°
Comfortable · down to 34°1° by 4 AM (dry)
UV tomorrow
4Moderate
Moderate 11 AM–5 PM · peak 4
Air quality
25Good
Main pollutant: PM10 (dust)
Pressure
30.19 inHg1022 hPa
Falling slowly · −0.04 inHg−1.2 hPa in 3 h

Next 2 hours

No precipitation expected in the next 2 hours.

Next 48 hours

Good hours for
  • Below 50°10° tonight after 8 PM
  • Low 36°2° tomorrow at 7 AM
  • Above 50°10° tomorrow by 11 AM
  • High 60°16° tomorrow at 2 PM
  • Fog tomorrow night 11 PM–3 AM
  1. This afternoonNear 56°13° · Clear
  2. TonightDown to 38°3° by 5 AM · Clear
  3. Tomorrow morningUp to 53°12° by 11 AM · Partly cloudy
  4. Tomorrow afternoonUp to 61°16° by 4 PM · Partly cloudy
  5. Tomorrow nightDown to 39°4° by 5 AM · Mostly cloudy
  6. Sunday morningUp to 52°11° by 11 AM · Mostly cloudy
  7. Sunday afternoonUp to 59°15° by 2 PM · Mostly cloudy
Hourly forecast, next 48 hours, in the place's local time
HourConditionsTemperatureFeels likePrecipitationWindHumidityCloud coverUV index
Fri 4pSunny57°14° (likely 57°14° to 58°14°)57°14°0%14 mph23 km/h from NNW, gusts 21 mph34 km/h72%0%2
Fri 5pSunny55°13° (likely 55°13° to 57°14°)55°13°0%6 mph10 km/h from N, gusts 19 mph30 km/h78%5%2
Fri 6pClear54°12° (likely 53°12° to 54°12°)54°12°0%6 mph10 km/h from N, gusts 13 mph21 km/h83%0%1
Fri 7pClear51°11° (likely 51°11° to 52°11°)51°11°0%6 mph10 km/h from N, gusts 9 mph15 km/h87%0%0
Fri 8pClear47°8° (likely 47°8° to 50°10°)47°8°0%1 mph2 km/h from ENE, gusts 6 mph9 km/h92%0%0
Fri 9pClear46°8° (likely 45°7° to 49°9°)46°8°0%1 mph2 km/h from ENE, gusts 3 mph4 km/h92%0%0
Fri 10pClear44°7° (likely 44°7° to 48°9°)44°7°0%1 mph2 km/h from ENE, gusts 5 mph9 km/h92%6%0
Fri 11pClear43°6° (likely 42°6° to 47°8°)43°6°0%1 mph2 km/h from ESE, gusts 6 mph10 km/h92%12%0
Sat 12aClear42°6° (likely 42°6° to 47°8°)42°6°0%1 mph2 km/h from ESE, gusts 6 mph9 km/h91%12%0
Sat 1aClear41°5° (likely 41°5° to 47°8°)41°5°0%1 mph2 km/h from ESE, gusts 5 mph8 km/h88%13%0
Sat 2aClear40°4° (likely 40°4° to 46°8°)40°4°0%2 mph3 km/h from SSE, gusts 5 mph8 km/h86%12%0
Sat 3aClear40°4° (likely 40°4° to 46°8°)40°4°0%2 mph3 km/h from SSE, gusts 5 mph9 km/h84%12%0
Sat 4aClear39°4° (likely 39°4° to 46°8°)39°4°0%2 mph3 km/h from SSE, gusts 5 mph7 km/h82%12%0
Sat 5aClear38°3° (likely 38°3° to 47°8°)38°3°0%1 mph2 km/h from SE, gusts 3 mph5 km/h80%12%0
Sat 6aClear38°3° (likely 38°3° to 47°8°)38°3°0%1 mph2 km/h from SE, gusts 3 mph5 km/h80%15%0
Sat 7aClear36°2° (likely 36°2° to 46°8°)36°2°0%1 mph2 km/h from SE, gusts 4 mph6 km/h80%17%0
Sat 8aMostly sunny37°3° (likely 37°3° to 47°8°)37°3°0%1 mph2 km/h from SSE, gusts 4 mph6 km/h78%39%0
Sat 9aMostly sunny41°5° (likely 41°5° to 50°10°)41°5°0%1 mph2 km/h from SSE, gusts 4 mph7 km/h77%39%1
Sat 10aMostly sunny48°9° (likely 48°9° to 57°14°)48°9°0%1 mph2 km/h from SSE, gusts 4 mph6 km/h72%48%2
Sat 11aPartly sunny53°12° (likely 53°12° to 61°16°)53°12°0%2 mph3 km/h from W, gusts 4 mph7 km/h67%46%3
Sat 12pPartly sunny55°13° (likely 55°13° to 64°18°)55°13°0%2 mph3 km/h from W, gusts 4 mph7 km/h64%45%4
Sat 1pSunny59°15° (likely 59°15° to 65°18°)59°15°0%2 mph3 km/h from W, gusts 5 mph7 km/h60%43%4
Sat 2pSunny60°16° (likely 60°16° to 65°18°)60°16°0%2 mph3 km/h from WSW, gusts 5 mph8 km/h59%41%4
Sat 3pSunny60°16° (likely 59°15° to 64°18°)60°16°0%2 mph3 km/h from WSW, gusts 6 mph9 km/h59%32%4
Sat 4pSunny61°16° (likely 58°14° to 62°17°)61°16°0%2 mph3 km/h from WSW, gusts 5 mph8 km/h63%41%3
Sat 5pSunny58°14° (likely 56°13° to 60°16°)58°14°0%1 mph2 km/h from WNW, gusts 5 mph8 km/h69%40%2
Sat 6pClear55°13° (likely 53°12° to 56°13°)55°13°0%1 mph2 km/h from WNW, gusts 3 mph5 km/h77%40%1
Sat 7pClear53°12° (likely 50°10° to 53°12°)53°12°0%1 mph2 km/h from WNW, gusts 3 mph5 km/h82%40%0
Sat 8pMostly cloudy48°9° (likely 48°9° to 50°10°)48°9°0%1 mph2 km/h from ENE, gusts 3 mph6 km/h87%47%0
Sat 9pMostly cloudy47°8° (likely 47°8° to 50°10°)47°8°0%1 mph2 km/h from ENE, gusts 5 mph8 km/h89%59%0
Sat 10pMostly cloudy46°8° (likely 46°8° to 49°9°)46°8°0%1 mph2 km/h from ENE, gusts 5 mph8 km/h91%62%0
Sat 11pFog45°7° (likely 45°7° to 49°9°)45°7°0%1 mph2 km/h from ESE, gusts 4 mph6 km/h91%66%0
Sun 12aFog44°7° (likely 44°7° to 49°9°)44°7°0%1 mph2 km/h from ESE, gusts 3 mph6 km/h92%70%0
Sun 1aFog43°6° (likely 43°6° to 50°10°)43°6°0%1 mph2 km/h from ESE, gusts 3 mph4 km/h93%74%0
Sun 2aFog42°6° (likely 42°6° to 49°9°)42°6°0%1 mph2 km/h from ESE, gusts 3 mph5 km/h94%78%0
Sun 3aCloudy41°5° (likely 41°5° to 48°9°)41°5°0%1 mph2 km/h from ESE, gusts 3 mph5 km/h94%79%0
Sun 4aMostly cloudy40°4° (likely 40°4° to 47°8°)40°4°0%1 mph2 km/h from ESE, gusts 3 mph5 km/h94%77%0
Sun 5aMostly cloudy39°4° (likely 39°4° to 47°8°)39°4°0%1 mph2 km/h from ESE, gusts 3 mph6 km/h94%77%0
Sun 6aMostly cloudy38°3° (likely 38°3° to 47°8°)38°3°0%1 mph2 km/h from ESE, gusts 4 mph6 km/h93%79%0
Sun 7aCloudy38°3° (likely 38°3° to 47°8°)38°3°0%1 mph2 km/h from ESE, gusts 4 mph6 km/h94%80%0
Sun 8aCloudy39°4° (likely 39°4° to 47°8°)39°4°0%1 mph2 km/h from ESE, gusts 4 mph6 km/h94%81%0
Sun 9aCloudy43°6° (likely 43°6° to 51°11°)43°6°0%1 mph2 km/h from ESE, gusts 4 mph7 km/h91%78%1
Sun 10aCloudy47°8° (likely 47°8° to 56°13°)47°8°0%1 mph2 km/h from ESE, gusts 3 mph4 km/h86%79%1
Sun 11aCloudy52°11° (likely 52°11° to 61°16°)52°11°5%0 mph0 km/h, gusts 4 mph6 km/h81%66%2
Sun 12pMostly cloudy55°13° (likely 55°13° to 69°21°)55°13°5%0 mph0 km/h, gusts 6 mph9 km/h76%63%3
Sun 1pMostly cloudy58°14° (likely 57°14° to 69°21°)58°14°5%0 mph0 km/h, gusts 7 mph12 km/h72%72%4
Sun 2pCloudy59°15° (likely 57°14° to 67°19°)59°15°5%3 mph5 km/h from W, gusts 8 mph12 km/h70%82%3
Sun 3pCloudy59°15° (likely 57°14° to 65°18°)59°15°5%3 mph5 km/h from W, gusts 7 mph10 km/h71%78%3

Days ahead

Shaded: typical range for these dates (1991–2020)
  1. Today, Oct 23. Cloudy. High 57°14°, low 36°2°. Typical 61°16° / 46°8°. Dry. Mostly agree.
    1. Afternoon

      noon–6 PM

      Sunny, 57°14°

      Dry

    2. Evening

      6 PM–midnight

      Clear, 47°8°

      Dry

    3. Overnight

      midnight–6 AM

      Clear, 38°3°

      Dry

    Official NWS forecast

    Today: Sunny, with a high near 57. North northwest wind 6 to 14 mph, with gusts as high as 22 mph.

    Tonight: Patchy frost after 5am. Mostly clear, with a low around 36. East southeast wind 1 to 6 mph.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    57°14°–59°15°
    Low, likely
    36°2°–46°8°
    Typical high / low
    61°16° / 46°8°
    Wind
    15 mph24 km/h, gusts 27 mph44 km/h
    UV peak
    4
  2. Tomorrow, Oct 24. Fog. High 62°17°, low 37°3°. Typical 61°16° / 46°8°. Dry. Forecasts differ.
    1. Morning

      6 AM–noon

      Mostly sunny, 37°3°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 61°16°

      Dry

    3. Evening

      6 PM–midnight

      Mostly cloudy, 48°9°

      Dry

    4. Overnight

      midnight–6 AM

      Cloudy, 39°4°

      Dry

    Official NWS forecast

    Day: Patchy frost before 11am. Mostly sunny. High near 62, with temperatures falling to around 58 in the afternoon. Southwest wind around 2 mph.

    Night: Mostly cloudy, with a low around 37. Northeast wind around 1 mph.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    60°16°–65°18°
    Low, likely
    37°3°–46°8°
    Typical high / low
    61°16° / 46°8°
    Wind
    6 mph9 km/h, gusts 14 mph22 km/h
    UV peak
    4
  3. Sunday, Oct 25. Rain. High 60°16°, low 43°6°. Typical 61°16° / 46°8°. Rain 0.06 in1.5 mm, 30% chance. Forecasts differ.
    1. Morning

      6 AM–noon

      Cloudy, 39°4°

      Dry

    2. Afternoon

      noon–6 PM

      Cloudy, 60°16°

      Dry

    3. Evening

      6 PM–midnight

      Cloudy, 52°11°

      30% chance · 0.08 in1.9 mm

    4. Overnight

      midnight–6 AM

      Drizzle, 51°10°

      60% chance · 0.09 in2.2 mm

    Official NWS forecast

    Day: A chance of rain after 5pm. Partly sunny, with a high near 60. South southwest wind 0 to 3 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

    Night: A chance of rain before 8pm, then rain likely and patchy fog. Mostly cloudy, with a low around 43. South wind around 3 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    57°14°–67°19°
    Low, likely
    43°6°–46°8°
    Typical high / low
    61°16° / 46°8°
    Wind
    8 mph12 km/h, gusts 17 mph27 km/h
    UV peak
    4
  4. Monday, Oct 26. Rain. High 57°14°, low 42°6°. Typical 61°16° / 46°8°. Rain 0.21 in5.3 mm, 60% chance. Forecasts differ.
    1. Morning

      6 AM–noon

      Showers, 50°10°

      60% chance · 0.09 in2.2 mm

    2. Afternoon

      noon–6 PM

      Showers, 58°14°

      60% chance · 0.04 in1 mm

    3. Evening

      6 PM–midnight

      Drizzle, 51°11°

      30% chance

    4. Overnight

      midnight–6 AM

      Clear, 44°7°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Rain likely. Mostly cloudy, with a high near 57. New rainfall amounts less than a tenth of an inch possible.

    Night: A chance of rain before 5am. Mostly cloudy, with a low around 42.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    56°13°–61°16°
    Low, likely
    42°6°–49°9°
    Typical high / low
    61°16° / 46°8°
    Wind
    7 mph11 km/h, gusts 17 mph28 km/h
    UV peak
    2
  5. Tuesday, Oct 27. Fog. High 56°13°, low 41°5°. Typical 61°16° / 46°8°. Dry. Forecasts differ.
    1. Morning

      6 AM–noon

      Sunny, 44°6°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 60°15°

      Dry

    3. Evening

      6 PM–midnight

      Clear, 50°10°

      Dry

    4. Overnight

      midnight–6 AM

      Clear, 46°8°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Patchy fog between 11am and 2pm. Mostly sunny, with a high near 56.

    Night: Patchy fog after 5am. Mostly cloudy, with a low around 41.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    56°13°–62°17°
    Low, likely
    40°4°–47°8°
    Typical high / low
    61°16° / 46°8°
    Wind
    8 mph13 km/h, gusts 19 mph30 km/h
    UV peak
    4
  6. Wednesday, Oct 28. Fog. High 58°14°, low 42°6°. Typical 60°16° / 46°8°. Dry. Forecasts differ.
    1. Morning

      6 AM–noon

      Cloudy, 46°8°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 58°15°

      Dry

    3. Evening

      6 PM–midnight

      Clear, 49°9°

      Dry

    4. Overnight

      midnight–6 AM

      Cloudy, 46°8°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Patchy fog before 8am. Partly sunny, with a high near 58.

    Night: Patchy fog after 2am. Mostly cloudy, with a low around 42.

    Forecasts differIndependent forecasts disagree; expect changes and plan for the range.

    High, likely
    54°12°–62°17°
    Low, likely
    41°5°–48°9°
    Typical high / low
    60°16° / 46°8°
    Wind
    7 mph12 km/h, gusts 13 mph20 km/h
    UV peak
    4
  7. Thursday, Oct 29. Rain. High 58°14°, low 43°6°. Typical 60°16° / 45°7°. Rain 0.05 in1.3 mm, 20% chance. Mostly agree.
    1. Morning

      6 AM–noon

      Cloudy, 47°8°

      Dry

    2. Afternoon

      noon–6 PM

      Drizzle, 58°15°

      20% chance · 0.03 in0.8 mm

    3. Evening

      6 PM–midnight

      Clear, 50°10°

      20% chance

    4. Overnight

      midnight–6 AM

      Mostly clear, 44°7°

      Dry

    Hours this far out come from computer models only.

    Official NWS forecast

    Day: Patchy fog before 8am, then a slight chance of rain. Partly sunny, with a high near 58.

    Night: A slight chance of rain before 8pm, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 43.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    55°13°–61°16°
    Low, likely
    43°6°–46°8°
    Typical high / low
    60°16° / 45°7°
    Wind
    8 mph13 km/h, gusts 23 mph37 km/h
    UV peak
    4
  8. Friday, Oct 30. Cloudy. High 57°14°, low 41°5°. Typical 60°16° / 45°7°. Rain 0.01 in0.3 mm, 30% chance. Mostly agree.
    1. Morning

      6 AM–noon

      Partly sunny, 46°8°

      20% chance

    2. Afternoon

      noon–6 PM

      Cloudy, 58°15°

      20% chance

    3. Evening

      6 PM–midnight

      Clear, 47°8°

      20% chance

    4. Overnight

      midnight–6 AM

      Cloudy, 44°6°

      20% chance

    Hours this far out come from computer models only.

    The National Weather Service writes about seven days ahead; this day is our model forecast only.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    55°13°–59°15°
    Low, likely
    38°3°–43°6°
    Typical high / low
    60°16° / 45°7°
    Wind
    8 mph13 km/h, gusts 17 mph28 km/h
    UV peak
    3
  9. Saturday, Oct 31. Cloudy. High 58°14°, low 43°6°. Typical 60°16° / 45°7°. Rain 0.01 in0.3 mm, 20% chance. Mostly agree.
    1. Morning

      6 AM–noon

      Cloudy, 46°8°

      Dry

    2. Afternoon

      noon–6 PM

      Sunny, 58°15°

      20% chance

    3. Evening

      6 PM–midnight

      Clear, 48°9°

      20% chance

    4. Overnight

      midnight–6 AM

      Clear, 43°6°

      Dry

    Hours this far out come from computer models only.

    The National Weather Service writes about seven days ahead; this day is our model forecast only.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    56°13°–61°16°
    Low, likely
    42°6°–44°7°
    Typical high / low
    60°16° / 45°7°
    Wind
    7 mph11 km/h, gusts 19 mph30 km/h
    UV peak
    4
  10. Sunday, Nov 1. Mostly sunny. High 60°16°, low 43°6°. Typical 60°16° / 45°7°. Rain 0.01 in0.3 mm, 30% chance. Mostly agree.
    1. Morning

      6 AM–noon

      Sunny, 46°8°

      20% chance

    2. Afternoon

      noon–6 PM

      Sunny, 61°16°

      30% chance

    3. Evening

      6 PM–midnight

      Clear, 50°10°

      30% chance

    Hours this far out come from computer models only.

    The National Weather Service writes about seven days ahead; this day is our model forecast only.

    Mostly agreeIndependent forecasts are fairly close; small surprises are possible.

    High, likely
    58°14°–62°17°
    Low, likely
    42°6°–44°7°
    Typical high / low
    60°16° / 45°7°
    Wind
    7 mph11 km/h, gusts 17 mph28 km/h
    UV peak
    4

The outlook

  1. Today

    Dry, high 57°, low 36°.

  2. Tomorrow

    Dry, high 62°, low 37°, warming up.

  3. Sunday

    30% chance of rain, high 60°, low 43°.

  4. Rest of week

    Highs 56–60°; chance of precipitation on Monday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (EKA) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue
Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Mad River near Arcata

3.4 mi
Below flood stage
Level
5.7 ft
Flow
56 cfs

Forecast peak 5.7 ft Tue 2 AM

Reading from Fri 2:45 PM · NWS gauge page

Eel River (CA) at Fernbridge

18 mi
Below flood stage
Level
-0.5 ft

Forecast peak 0.2 ft Fri 4 PM

Reading from Fri 3:15 PM · NWS gauge page

Trinity River at Hoopa

25 mi
Below flood stage
Level
11.2 ft
Flow
639 cfs

Forecast peak 11.2 ft Fri 4 PM

Reading from Fri 3 PM · NWS gauge page

Little River near Trinidad

10 mi
Level
1.6 ft
Flow
9 cfs

Reading from Fri 2:30 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 57% less heating than a typical week.

This week 35Typical 82

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F
28
h below 17°F
0
h below 5°F
0

47, 17 and 5°F are the test points heat pumps are rated at. About 15 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 43°F).

Open the windows?

Sat, 2:00 PM–4:00 PM

Good stretch to open the windows (air quality forecast not available for part of this window).

Is this typical?

Eureka WFO Woodley Island · official normals 1991–2020 · records 1886–2026

Oct 23, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Normal high / low
61°16° / 46°8°
Forecast high / low
57°14° / 36°2°
Record high
80°27° in 1965
Record low
37°3° in 1935

Last 7 days vs normal

On average 1°0° colder than normal (daily mean temperature).

  1. −2°−1°SatOct 17
  2. −1°SunOct 18
  3. +1°±0°MonOct 19
  4. +1°±0°TueOct 20
  5. −1°WedOct 21
  6. ±0°ThuOct 22
  7. —FriOct 23

Arcata weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Sunrise 7:36 AM, sunset 6:23 PM.

Daylight
10 h 47 min
Losing 2 min 30 s a day; shortest Dec 21, 1 h 33 min less
Golden hour
5:45–6:41 PM
Morning 7:19–8:14 AM
Blue hour
6:41–6:51 PM
Morning 7:08–7:19 AM; first light 7:08 AM

Stars tonight? Good

Clear 6:51 PM–7:09 AM; moon 96% lit, sets 5:58 AM.

Moon

Waxing gibbous

94% lit · growing

Today
sets 4:48 AM · rises 4:59 PM
Full moon
Oct 25
New moon
Nov 8
Looking east from Arcata. The highest point on the skyline is about 3,400 ft, 15 mi away.Skyline from USGS elevation data, heights drawn up to 3× taller. Sky, sun and moon as they are now.