Frost Advisory
Starts in 2 h 42 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 precautionsHide details
What
Temperatures as low as 35 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 9:55 PM PDT at KACV

Eureka, CA weather

Clear and 45°7°.

Mostly agree

Now 45°7°

Clear

Wind: 5 mph7 km/h; From the east. Light through 10 AM
Dew point: 43°6°; Comfortable · down to 34°1° by 7 AM (dry)
Humidity: 93%; Air 45°7°, dew point 43°6° · fog or dew likely
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 36Good; Main pollutant: PM10 (dust)
Pressure: 30.17 inHg1022 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

5°3° cooler than this time yesterday (50°10° then, 45°7° now)

Good hours for

Low 39°4° tomorrow at 7 AM
Above 50°10° tomorrow by 10 AM
High 58°14° tomorrow at 2 PM
Below 50°10° tomorrow night after 8 PM

TonightDown to 40°4° by 5 AM · Clear
Tomorrow morningUp to 53°12° by 11 AM · Clear
Tomorrow afternoonUp to 58°14° by 2 PM · Partly cloudy
Tomorrow nightDown to 42°6° by 5 AM · Mostly cloudy
Sunday morningUp to 54°12° by 11 AM · Mostly cloudy
Sunday afternoonNear 56°13° · rain chance 30% · Mostly cloudy
Sunday nightDown to 50°10° by 9 PM · Partly cloudy · rain chance 30%

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Fri 10p	Clear	47°8° (likely 45°7° to 51°11°)	47°8°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	94%	2%	0
Fri 11p	Clear	45°7° (likely 43°6° to 50°10°)	44°7°	0%	3 mph5 km/h from SSE, gusts 5 mph7 km/h	94%	2%	0
Sat 12a	Clear	45°7° (likely 43°6° to 48°9°)	43°6°	0%	3 mph5 km/h from SSE, gusts 5 mph8 km/h	93%	11%	0
Sat 1a	Clear	44°7° (likely 43°6° to 47°8°)	42°6°	0%	3 mph5 km/h from SSE, gusts 5 mph8 km/h	91%	11%	0
Sat 2a	Clear	43°6° (likely 43°6° to 47°8°)	41°5°	0%	3 mph5 km/h from SSE, gusts 5 mph8 km/h	89%	10%	0
Sat 3a	Clear	43°6° (likely 43°6° to 46°8°)	41°5°	0%	3 mph5 km/h from SSE, gusts 6 mph9 km/h	88%	11%	0
Sat 4a	Clear	41°5° (likely 41°5° to 46°8°)	39°4°	0%	3 mph5 km/h from SSE, gusts 6 mph9 km/h	86%	11%	0
Sat 5a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	2 mph3 km/h from SSE, gusts 6 mph9 km/h	84%	9%	0
Sat 6a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	2 mph3 km/h from SSE, gusts 6 mph9 km/h	83%	8%	0
Sat 7a	Clear	39°4° (likely 39°4° to 46°8°)	39°4°	0%	2 mph3 km/h from SSE, gusts 5 mph8 km/h	82%	6%	0
Sat 8a	Sunny	40°4° (likely 40°4° to 47°8°)	40°4°	0%	1 mph2 km/h from SSE, gusts 5 mph8 km/h	80%	10%	0
Sat 9a	Sunny	44°7° (likely 44°7° to 50°10°)	44°7°	0%	1 mph2 km/h from SSE, gusts 5 mph8 km/h	75%	13%	1
Sat 10a	Partly sunny	50°10° (likely 49°9° to 56°13°)	50°10°	0%	1 mph2 km/h from SSE, gusts 4 mph6 km/h	72%	21%	2
Sat 11a	Sunny	53°12° (likely 52°11° to 61°16°)	53°12°	0%	5 mph8 km/h from NW, gusts 4 mph6 km/h	64%	41%	3
Sat 12p	Sunny	54°12° (likely 54°12° to 63°17°)	54°12°	0%	5 mph8 km/h from NW, gusts 4 mph7 km/h	67%	41%	4
Sat 1p	Sunny	57°14° (likely 54°12° to 63°17°)	57°14°	0%	5 mph8 km/h from NW, gusts 5 mph8 km/h	65%	41%	4
Sat 2p	Sunny	58°14° (likely 54°12° to 63°17°)	58°14°	0%	6 mph10 km/h from NW, gusts 6 mph10 km/h	65%	42%	4
Sat 3p	Sunny	58°14° (likely 54°12° to 63°17°)	58°14°	0%	6 mph10 km/h from NW, gusts 8 mph13 km/h	69%	34%	4
Sat 4p	Sunny	58°14° (likely 54°12° to 61°16°)	58°14°	0%	6 mph10 km/h from NW, gusts 9 mph15 km/h	73%	34%	3
Sat 5p	Sunny	56°13° (likely 54°12° to 59°15°)	56°13°	0%	3 mph5 km/h from NNW, gusts 8 mph14 km/h	78%	17%	2
Sat 6p	Partly cloudy	55°13° (likely 52°11° to 56°13°)	55°13°	0%	3 mph5 km/h from NNW, gusts 9 mph14 km/h	81%	28%	1
Sat 7p	Clear	53°12° (likely 50°10° to 53°12°)	53°12°	0%	3 mph5 km/h from NNW, gusts 9 mph14 km/h	87%	37%	0
Sat 8p	Mostly cloudy	48°9° (likely 48°9° to 51°11°)	48°9°	0%	2 mph3 km/h from NNE, gusts 7 mph12 km/h	91%	37%	0
Sat 9p	Mostly cloudy	48°9° (likely 47°8° to 51°11°)	48°9°	0%	2 mph3 km/h from NNE, gusts 8 mph13 km/h	93%	54%	0
Sat 10p	Cloudy	47°8° (likely 46°8° to 50°10°)	47°8°	0%	2 mph3 km/h from NNE, gusts 7 mph12 km/h	94%	68%	0
Sat 11p	Mostly cloudy	46°8° (likely 45°7° to 50°10°)	46°8°	0%	2 mph3 km/h from ENE, gusts 7 mph10 km/h	91%	73%	0
Sun 12a	Cloudy	46°8° (likely 45°7° to 50°10°)	46°8°	0%	2 mph3 km/h from ENE, gusts 6 mph9 km/h	94%	78%	0
Sun 1a	Cloudy	46°8° (likely 45°7° to 49°9°)	46°8°	0%	2 mph3 km/h from ENE, gusts 5 mph9 km/h	93%	79%	0
Sun 2a	Cloudy	44°7° (likely 44°7° to 49°9°)	44°7°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	94%	80%	0
Sun 3a	Cloudy	43°6° (likely 43°6° to 49°9°)	43°6°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	95%	81%	0
Sun 4a	Cloudy	43°6° (likely 43°6° to 50°10°)	43°6°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	95%	80%	0
Sun 5a	Cloudy	42°6° (likely 42°6° to 50°10°)	40°4°	0%	3 mph5 km/h from E, gusts 7 mph10 km/h	95%	80%	0
Sun 6a	Cloudy	40°4° (likely 40°4° to 50°10°)	38°3°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	95%	79%	0
Sun 7a	Mostly cloudy	40°4° (likely 40°4° to 49°9°)	38°3°	0%	3 mph5 km/h from E, gusts 8 mph12 km/h	95%	74%	0
Sun 8a	Mostly cloudy	41°5° (likely 41°5° to 48°9°)	39°4°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	93%	73%	0
Sun 9a	Mostly cloudy	45°7° (likely 45°7° to 51°11°)	43°6°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	88%	66%	0
Sun 10a	Cloudy	50°10° (likely 50°10° to 54°12°)	49°9°	0%	3 mph5 km/h from E, gusts 5 mph8 km/h	81%	80%	1
Sun 11a	Cloudy	54°12° (likely 52°11° to 57°14°)	54°12°	0%	1 mph2 km/h from SSW, gusts 4 mph6 km/h	75%	84%	2
Sun 12p	Cloudy	56°13° (likely 55°13° to 59°15°)	56°13°	0%	1 mph2 km/h from SSW, gusts 4 mph6 km/h	72%	86%	3
Sun 1p	Cloudy	58°14° (likely 56°13° to 60°16°)	58°14°	0%	1 mph2 km/h from SSW, gusts 5 mph7 km/h	72%	88%	4
Sun 2p	Cloudy	58°14° (likely 56°13° to 61°16°)	58°14°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	73%	96%	4
Sun 3p	Cloudy	58°14° (likely 56°13° to 61°16°)	58°14°	0%	3 mph5 km/h from W, gusts 4 mph7 km/h	76%	97%	3
Sun 4p	Mostly cloudy	57°14° (likely 57°14° to 60°16°)	57°14°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	80%	72%	2
Sun 5p	Sunny	56°13° (likely 56°13° to 58°14°)	56°13°	30%	2 mph3 km/h from WSW, gusts 6 mph9 km/h	84%	56%	1
Sun 6p	Rain	54°12° (likely 53°12° to 56°13°)	54°12°	30%	2 mph3 km/h from WSW, gusts 3 mph5 km/h	88%	42%	0
Sun 7p	Mostly clear	53°12° (likely 50°10° to 53°12°)	53°12°	30%	2 mph3 km/h from WSW, gusts 4 mph7 km/h	92%	42%	0
Sun 8p	Rain	51°11° (likely 50°10° to 51°11°)	51°11°	30%	2 mph3 km/h from S, gusts 6 mph10 km/h	95%	57%	0
Sun 9p	Rain	50°10° (likely 49°9° to 52°11°)	50°10°	30%	2 mph3 km/h from S, gusts 8 mph12 km/h	96%	48%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 23. Sunny. High 57°14°, low 39°4°. Typical 61°16° / 46°8°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Tonight: Mostly clear, with a low around 39. Southeast wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
56°13°–59°15°
Low, likely
39°4°–48°9°
Typical high / low
61°16° / 46°8°
Wind
19 mph31 km/h, gusts 33 mph54 km/h
UV peak
4
Tomorrow, Oct 24. Partly sunny. High 59°15°, low 40°4°. Typical 61°16° / 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Mostly cloudy, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 42°6°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 59. West northwest wind 1 to 6 mph.
Night: Mostly cloudy, with a low around 40. Northeast wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–64°18°
Low, likely
40°4°–45°7°
Typical high / low
61°16° / 46°8°
Wind
7 mph11 km/h, gusts 14 mph22 km/h
UV peak
4
Sunday, Oct 25. Rain. High 59°15°, low 45°7°. Typical 61°16° / 46°8°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly cloudy, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°14°
  30% chance
3. Evening
  6 PM–midnight
  Rain, 51°11°
  30% chance · 0.01 in0.3 mm
4. Overnight
  midnight–6 AM
  Drizzle, 49°10°
  70% chance · 0.11 in2.9 mm
Official NWS forecast
Day: A chance of rain after 5pm. Partly sunny, with a high near 59. South southwest wind around 3 mph. Chance of precipitation is 30%.
Night: Rain likely. Mostly cloudy, with a low around 45. South southwest wind 2 to 6 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
55°13°–61°16°
Low, likely
43°6°–47°8°
Typical high / low
61°16° / 46°8°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Monday, Oct 26. Rain. High 58°14°, low 44°7°. Typical 61°16° / 46°8°. Rain 0.2 in5.1 mm, 60% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 49°10°
  60% chance · 0.05 in1.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 58°14°
  50% chance · 0.05 in1.2 mm
3. Evening
  6 PM–midnight
  Clear, 51°10°
  30% chance
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely. Mostly cloudy, with a high near 58. South southwest wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Night: A chance of rain before 5am. Mostly cloudy, with a low around 44. New rainfall amounts less than a tenth of an inch possible.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–60°16°
Low, likely
44°7°–49°9°
Typical high / low
61°16° / 46°8°
Wind
7 mph12 km/h, gusts 17 mph27 km/h
UV peak
3
Tuesday, Oct 27. Fog. High 55°13°, low 43°6°. Typical 61°16° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 51°10°
  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 between 11am and 2pm. Partly sunny, with a high near 55.
Night: Mostly cloudy, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–60°16°
Low, likely
43°6°–48°9°
Typical high / low
61°16° / 46°8°
Wind
11 mph17 km/h, gusts 17 mph28 km/h
UV peak
2
Wednesday, Oct 28. Mostly cloudy. High 56°13°, low 44°7°. Typical 60°16° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 56.
Night: Patchy fog between 2am and 5am. Mostly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–59°15°
Low, likely
41°5°–50°10°
Typical high / low
60°16° / 46°8°
Wind
10 mph15 km/h
UV peak
4
Thursday, Oct 29. Rain. High 57°14°, low 45°7°. Typical 60°16° / 45°7°. Rain 0.04 in1 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 56°13°
  20% chance · 0.02 in0.4 mm
3. Evening
  6 PM–midnight
  Clear, 49°9°
  20% chance
4. Overnight
  midnight–6 AM
  Mostly clear, 42°5°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain after 5pm. Partly sunny, with a high near 57.
Night: A slight chance of rain. Mostly cloudy, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–58°14°
Low, likely
41°5°–48°9°
Typical high / low
60°16° / 45°7°
Wind
9 mph14 km/h, gusts 23 mph37 km/h
UV peak
4
Friday, Oct 30. Rain. High 56°13°, low 42°6°. Typical 60°16° / 45°7°. Rain 0.02 in0.5 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  30% chance
3. Evening
  6 PM–midnight
  Mostly clear, 48°9°
  30% chance
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 56.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–58°14°
Low, likely
39°4°–45°7°
Typical high / low
60°16° / 45°7°
Wind
11 mph17 km/h, gusts 17 mph28 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 58°14°, low 45°7°. Typical 60°16° / 45°7°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 47°8°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 50°10°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–65°18°
Low, likely
42°6°–46°8°
Typical high / low
60°16° / 45°7°
Wind
11 mph18 km/h, gusts 19 mph30 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 62°17°, low 46°8°. Typical 60°16° / 45°7°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–73°23°
Low, likely
44°7°–50°10°
Typical high / low
60°16° / 45°7°
Wind
9 mph15 km/h, gusts 17 mph28 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 57°, low 39°.
Tomorrow
Dry, high 59°, low 40°.
Sunday
30% chance of rain, high 59°, low 45°.
Rest of week
Highs 55–62°; 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

9.2 mi

Below flood stage

Level: 5.8 ft
Flow: 63 cfs

Forecast peak 5.7 ft Tue 2 AM

Reading from Fri 8:45 PM · NWS gauge page

Eel River (CA) at Fernbridge

13 mi

Below flood stage

Level: -0.5 ft

Forecast peak 0.2 ft Fri 10 PM

Reading from Fri 8:15 PM · NWS gauge page

Eel River (CA) near Scotia

21 mi

Below flood stage

Level: 8.8 ft
Flow: 107 cfs

Forecast peak 8.8 ft Sat 5 AM

Reading from Fri 8:15 PM · NWS gauge page

Elk River near Falk

6.6 mi

Level: 2.6 ft

Reading from Fri 8:45 PM · NWS gauge page

For your home

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

Heating this week

About 61% less heating than a typical week.

This week 32Typical 82

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 23
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 9 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 43°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

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.

Last 7 days vs normal

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

−2°−1°SatOct 17
−1°SunOct 18
+1°±0°MonOct 19
+1°±0°TueOct 20
−1°WedOct 21
±0°ThuOct 22
—FriOct 23

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

Sun & moon

Sun

Daylight: 10 h 47 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 33 min less
Golden hour: 5:46–6:41 PM; Morning 7:19–8:14 AM
Blue hour: 6:41–6:52 PM; Morning 7:09–7:19 AM; first light 7:09 AM

Stars tonight? Fair

Clear 10:18 PM–7:10 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

95% lit · growing

Today: sets 4:49 AM · rises 4:59 PM
Full moon: Oct 25
New moon: Nov 8

Looking east from Eureka. The highest point on the skyline is about 5,000 ft, 21 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Frost Advisory

Eureka, CA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Mad River near Arcata

Eel River (CA) at Fernbridge

Eel River (CA) near Scotia

Elk River near Falk

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 23, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon