Arcata, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arcata, a city in Humboldt County, California.
Today
66°F
Mostly Cloudy
Mostly cloudy. High near 66, with temperatures falling to around 62 in the afternoon. South southeast wind 2 to 9 mph.
7-day forecast for Arcata
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Mostly Cloudy | 2 to 9 mph SSE | 8% |
| Tonight | 43°F | Partly Cloudy then Patchy Fog | 5 mph ESE | 4% |
| Wednesday | 61°F | Patchy Fog then Chance Light Rain | 2 to 6 mph NNW | 27% |
| Wednesday Night | 46°F | Chance Light Rain | 3 mph NE | 27% |
| Thursday | 61°F | Patchy Fog then Mostly Sunny | 1 to 6 mph N | 2% |
| Thursday Night | 42°F | Patchy Fog | 1 to 5 mph NE | 1% |
| Friday | 62°F | Patchy Fog then Partly Sunny | 0 to 3 mph NNE | 1% |
| Friday Night | 45°F | Partly Cloudy | 2 mph NE | 0% |
| Saturday | 63°F | Mostly Sunny | 2 mph SE | 5% |
| Saturday Night | 48°F | Mostly Cloudy then Chance Light Rain | 1 to 5 mph SSE | 26% |
| Sunday | 61°F | Chance Light Rain then Mostly Cloudy | 2 mph NNW | 26% |
| Sunday Night | 47°F | Patchy Fog | 2 mph NE | 7% |
| Monday | 60°F | Slight Chance Light Rain | 0 to 3 mph SSW | 18% |
| Monday Night | 46°F | Chance Light Rain | 5 mph S | 25% |
Forecast source: National Weather Service (api.weather.gov) for Arcata (40.862, -124.075). Updated through the day.
Growing snapshot for Arcata
Last spring frost
Feb 22
First fall frost
Dec 7
Growing season
293 days
Hardiness zone
9b
More local growing data for Arcata: nearby ZIP 95521 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Alderpoint
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Benbow
Big Lagoon
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Eureka
Fairhaven
Ferndale
Fieldbrook
Fields Landing
Fortuna
Garberville
Hoopa
Humboldt Hill
Hydesville
Indianola
Kep'el
Loleta
Manila
McKinleyville
Miranda
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Pine Hills
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Redway
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Climate data from the nearest NOAA station, Eureka Wfo Woodley Island, Ca (6.4 mi from Arcata). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.