Fortuna, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fortuna, a city in Humboldt County, California.
This Afternoon
62°F
Mostly Cloudy
Mostly cloudy. High near 62, with temperatures falling to around 58 in the afternoon. Northwest wind 6 to 9 mph.
7-day forecast for Fortuna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Mostly Cloudy | 6 to 9 mph NW | 2% |
| Tonight | 45°F | Mostly Cloudy | 2 to 6 mph NW | 2% |
| Thursday | 62°F | Partly Sunny | 3 to 10 mph NW | 0% |
| Thursday Night | 43°F | Mostly Cloudy then Patchy Fog | 1 to 6 mph NE | 0% |
| Friday | 63°F | Patchy Fog then Partly Sunny | 1 to 7 mph N | 0% |
| Friday Night | 44°F | Mostly Clear | 1 to 6 mph ENE | 0% |
| Saturday | 66°F | Mostly Sunny | 1 to 5 mph SSW | 1% |
| Saturday Night | 48°F | Mostly Cloudy then Patchy Fog | 1 to 5 mph SSE | 14% |
| Sunday | 63°F | Patchy Fog then Mostly Cloudy | 1 to 5 mph NE | 14% |
| Sunday Night | 48°F | Areas Of Fog | 0 to 5 mph ENE | 2% |
| Monday | 62°F | Areas Of Fog then Mostly Cloudy | 0 to 6 mph WNW | 3% |
| Monday Night | 46°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 6 mph ENE | 15% |
| Tuesday | 64°F | Slight Chance Light Rain then Patchy Fog | 1 to 6 mph SSE | 18% |
| Tuesday Night | 49°F | Chance Light Rain | 3 to 9 mph S | 31% |
Forecast source: National Weather Service (api.weather.gov) for Fortuna (40.587, -124.142). Updated through the day.
Growing snapshot for Fortuna
Last spring frost
Feb 1
First fall frost
Dec 19
Growing season
328 days
Hardiness zone
9b
More local growing data for Fortuna: nearby ZIP 95540 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Scotia, Ca (5.9 mi from Fortuna). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.