Mad River near Arcata
3.4 mi- Level
- 5.7 ft
- Flow
- 56 cfs
Forecast peak 5.7 ft Tue 2 AM
Reading from Fri 2:45 PM · NWS gauge page
Appearance
Starts in 8 h 38 min
Issued for this forecast zone · National Weather Service Eureka CA
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
Rainy and 59°15°.
Today: low 36°2° (likely 36°2° to 46°8°), high 57°14° (likely 57°14° to 59°15°).
Now 59°15°
Rain
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Fri 4p | Sunny | 57°14° (likely 57°14° to 58°14°) | 57°14° | 0% | 14 mph23 km/h from NNW, gusts 21 mph34 km/h | 72% | 0% | 2 |
| Fri 5p | Sunny | 55°13° (likely 55°13° to 57°14°) | 55°13° | 0% | 6 mph10 km/h from N, gusts 19 mph30 km/h | 78% | 5% | 2 |
| Fri 6p | Clear | 54°12° (likely 53°12° to 54°12°) | 54°12° | 0% | 6 mph10 km/h from N, gusts 13 mph21 km/h | 83% | 0% | 1 |
| Fri 7p | Clear | 51°11° (likely 51°11° to 52°11°) | 51°11° | 0% | 6 mph10 km/h from N, gusts 9 mph15 km/h | 87% | 0% | 0 |
| Fri 8p | Clear | 47°8° (likely 47°8° to 50°10°) | 47°8° | 0% | 1 mph2 km/h from ENE, gusts 6 mph9 km/h | 92% | 0% | 0 |
| Fri 9p | Clear | 46°8° (likely 45°7° to 49°9°) | 46°8° | 0% | 1 mph2 km/h from ENE, gusts 3 mph4 km/h | 92% | 0% | 0 |
| Fri 10p | Clear | 44°7° (likely 44°7° to 48°9°) | 44°7° | 0% | 1 mph2 km/h from ENE, gusts 5 mph9 km/h | 92% | 6% | 0 |
| Fri 11p | Clear | 43°6° (likely 42°6° to 47°8°) | 43°6° | 0% | 1 mph2 km/h from ESE, gusts 6 mph10 km/h | 92% | 12% | 0 |
| Sat 12a | Clear | 42°6° (likely 42°6° to 47°8°) | 42°6° | 0% | 1 mph2 km/h from ESE, gusts 6 mph9 km/h | 91% | 12% | 0 |
| Sat 1a | Clear | 41°5° (likely 41°5° to 47°8°) | 41°5° | 0% | 1 mph2 km/h from ESE, gusts 5 mph8 km/h | 88% | 13% | 0 |
| Sat 2a | Clear | 40°4° (likely 40°4° to 46°8°) | 40°4° | 0% | 2 mph3 km/h from SSE, gusts 5 mph8 km/h | 86% | 12% | 0 |
| Sat 3a | Clear | 40°4° (likely 40°4° to 46°8°) | 40°4° | 0% | 2 mph3 km/h from SSE, gusts 5 mph9 km/h | 84% | 12% | 0 |
| Sat 4a | Clear | 39°4° (likely 39°4° to 46°8°) | 39°4° | 0% | 2 mph3 km/h from SSE, gusts 5 mph7 km/h | 82% | 12% | 0 |
| Sat 5a | Clear | 38°3° (likely 38°3° to 47°8°) | 38°3° | 0% | 1 mph2 km/h from SE, gusts 3 mph5 km/h | 80% | 12% | 0 |
| Sat 6a | Clear | 38°3° (likely 38°3° to 47°8°) | 38°3° | 0% | 1 mph2 km/h from SE, gusts 3 mph5 km/h | 80% | 15% | 0 |
| Sat 7a | Clear | 36°2° (likely 36°2° to 46°8°) | 36°2° | 0% | 1 mph2 km/h from SE, gusts 4 mph6 km/h | 80% | 17% | 0 |
| Sat 8a | Mostly sunny | 37°3° (likely 37°3° to 47°8°) | 37°3° | 0% | 1 mph2 km/h from SSE, gusts 4 mph6 km/h | 78% | 39% | 0 |
| Sat 9a | Mostly sunny | 41°5° (likely 41°5° to 50°10°) | 41°5° | 0% | 1 mph2 km/h from SSE, gusts 4 mph7 km/h | 77% | 39% | 1 |
| Sat 10a | Mostly sunny | 48°9° (likely 48°9° to 57°14°) | 48°9° | 0% | 1 mph2 km/h from SSE, gusts 4 mph6 km/h | 72% | 48% | 2 |
| Sat 11a | Partly sunny | 53°12° (likely 53°12° to 61°16°) | 53°12° | 0% | 2 mph3 km/h from W, gusts 4 mph7 km/h | 67% | 46% | 3 |
| Sat 12p | Partly sunny | 55°13° (likely 55°13° to 64°18°) | 55°13° | 0% | 2 mph3 km/h from W, gusts 4 mph7 km/h | 64% | 45% | 4 |
| Sat 1p | Sunny | 59°15° (likely 59°15° to 65°18°) | 59°15° | 0% | 2 mph3 km/h from W, gusts 5 mph7 km/h | 60% | 43% | 4 |
| Sat 2p | Sunny | 60°16° (likely 60°16° to 65°18°) | 60°16° | 0% | 2 mph3 km/h from WSW, gusts 5 mph8 km/h | 59% | 41% | 4 |
| Sat 3p | Sunny | 60°16° (likely 59°15° to 64°18°) | 60°16° | 0% | 2 mph3 km/h from WSW, gusts 6 mph9 km/h | 59% | 32% | 4 |
| Sat 4p | Sunny | 61°16° (likely 58°14° to 62°17°) | 61°16° | 0% | 2 mph3 km/h from WSW, gusts 5 mph8 km/h | 63% | 41% | 3 |
| Sat 5p | Sunny | 58°14° (likely 56°13° to 60°16°) | 58°14° | 0% | 1 mph2 km/h from WNW, gusts 5 mph8 km/h | 69% | 40% | 2 |
| Sat 6p | Clear | 55°13° (likely 53°12° to 56°13°) | 55°13° | 0% | 1 mph2 km/h from WNW, gusts 3 mph5 km/h | 77% | 40% | 1 |
| Sat 7p | Clear | 53°12° (likely 50°10° to 53°12°) | 53°12° | 0% | 1 mph2 km/h from WNW, gusts 3 mph5 km/h | 82% | 40% | 0 |
| Sat 8p | Mostly cloudy | 48°9° (likely 48°9° to 50°10°) | 48°9° | 0% | 1 mph2 km/h from ENE, gusts 3 mph6 km/h | 87% | 47% | 0 |
| Sat 9p | Mostly cloudy | 47°8° (likely 47°8° to 50°10°) | 47°8° | 0% | 1 mph2 km/h from ENE, gusts 5 mph8 km/h | 89% | 59% | 0 |
| Sat 10p | Mostly cloudy | 46°8° (likely 46°8° to 49°9°) | 46°8° | 0% | 1 mph2 km/h from ENE, gusts 5 mph8 km/h | 91% | 62% | 0 |
| Sat 11p | Fog | 45°7° (likely 45°7° to 49°9°) | 45°7° | 0% | 1 mph2 km/h from ESE, gusts 4 mph6 km/h | 91% | 66% | 0 |
| Sun 12a | Fog | 44°7° (likely 44°7° to 49°9°) | 44°7° | 0% | 1 mph2 km/h from ESE, gusts 3 mph6 km/h | 92% | 70% | 0 |
| Sun 1a | Fog | 43°6° (likely 43°6° to 50°10°) | 43°6° | 0% | 1 mph2 km/h from ESE, gusts 3 mph4 km/h | 93% | 74% | 0 |
| Sun 2a | Fog | 42°6° (likely 42°6° to 49°9°) | 42°6° | 0% | 1 mph2 km/h from ESE, gusts 3 mph5 km/h | 94% | 78% | 0 |
| Sun 3a | Cloudy | 41°5° (likely 41°5° to 48°9°) | 41°5° | 0% | 1 mph2 km/h from ESE, gusts 3 mph5 km/h | 94% | 79% | 0 |
| Sun 4a | Mostly cloudy | 40°4° (likely 40°4° to 47°8°) | 40°4° | 0% | 1 mph2 km/h from ESE, gusts 3 mph5 km/h | 94% | 77% | 0 |
| Sun 5a | Mostly cloudy | 39°4° (likely 39°4° to 47°8°) | 39°4° | 0% | 1 mph2 km/h from ESE, gusts 3 mph6 km/h | 94% | 77% | 0 |
| Sun 6a | Mostly cloudy | 38°3° (likely 38°3° to 47°8°) | 38°3° | 0% | 1 mph2 km/h from ESE, gusts 4 mph6 km/h | 93% | 79% | 0 |
| Sun 7a | Cloudy | 38°3° (likely 38°3° to 47°8°) | 38°3° | 0% | 1 mph2 km/h from ESE, gusts 4 mph6 km/h | 94% | 80% | 0 |
| Sun 8a | Cloudy | 39°4° (likely 39°4° to 47°8°) | 39°4° | 0% | 1 mph2 km/h from ESE, gusts 4 mph6 km/h | 94% | 81% | 0 |
| Sun 9a | Cloudy | 43°6° (likely 43°6° to 51°11°) | 43°6° | 0% | 1 mph2 km/h from ESE, gusts 4 mph7 km/h | 91% | 78% | 1 |
| Sun 10a | Cloudy | 47°8° (likely 47°8° to 56°13°) | 47°8° | 0% | 1 mph2 km/h from ESE, gusts 3 mph4 km/h | 86% | 79% | 1 |
| Sun 11a | Cloudy | 52°11° (likely 52°11° to 61°16°) | 52°11° | 5% | 0 mph0 km/h, gusts 4 mph6 km/h | 81% | 66% | 2 |
| Sun 12p | Mostly cloudy | 55°13° (likely 55°13° to 69°21°) | 55°13° | 5% | 0 mph0 km/h, gusts 6 mph9 km/h | 76% | 63% | 3 |
| Sun 1p | Mostly cloudy | 58°14° (likely 57°14° to 69°21°) | 58°14° | 5% | 0 mph0 km/h, gusts 7 mph12 km/h | 72% | 72% | 4 |
| Sun 2p | Cloudy | 59°15° (likely 57°14° to 67°19°) | 59°15° | 5% | 3 mph5 km/h from W, gusts 8 mph12 km/h | 70% | 82% | 3 |
| Sun 3p | Cloudy | 59°15° (likely 57°14° to 65°18°) | 59°15° | 5% | 3 mph5 km/h from W, gusts 7 mph10 km/h | 71% | 78% | 3 |
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
30% chance · 0.08 in1.9 mm
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
60% chance · 0.09 in2.2 mm
Afternoon
noon–6 PM
60% chance · 0.04 in1 mm
Evening
6 PM–midnight
30% chance
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
20% chance · 0.03 in0.8 mm
Evening
6 PM–midnight
20% chance
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
20% chance
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
20% chance
Overnight
midnight–6 AM
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.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
30% chance
Evening
6 PM–midnight
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.
Dry, high 57°, low 36°.
Dry, high 62°, low 37°, warming up.
30% chance of rain, high 60°, low 43°.
Highs 56–60°; chance of precipitation on Monday.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (EKA) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 5.7 ft Tue 2 AM
Reading from Fri 2:45 PM · NWS gauge page
Forecast peak 0.2 ft Fri 4 PM
Reading from Fri 3:15 PM · NWS gauge page
Forecast peak 11.2 ft Fri 4 PM
Reading from Fri 3 PM · NWS gauge page
Reading from Fri 2:30 PM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
About 57% less heating than a typical week.
Heating degree days, base 65°F
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.
Dry air outside (dew point 43°F).
Sat, 2:00 PM–4:00 PM
Good stretch to open the windows (air quality forecast not available for part of this window).
Today’s expected high is 4°2° colder than typical.
On average 1°0° colder than normal (daily mean temperature).
Arcata weather by month: normals, records, snow and freeze dates
Sunrise 7:36 AM, sunset 6:23 PM.
Clear 6:51 PM–7:09 AM; moon 96% lit, sets 5:58 AM.
Waxing gibbous
94% lit · growing