Fortuna, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fortuna, a city in Humboldt County, California.
Tonight
44°F
Partly Cloudy then Patchy Fog
Patchy fog after 4am. Partly cloudy, with a low around 44. East southeast wind around 5 mph.
7-day forecast for Fortuna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Partly Cloudy then Patchy Fog | 5 mph ESE | 1% |
| Wednesday | 62°F | Patchy Fog then Partly Sunny | 3 to 8 mph NE | 10% |
| Wednesday Night | 47°F | Patchy Fog | 5 mph WNW | 10% |
| Thursday | 62°F | Patchy Fog then Mostly Sunny | 2 to 9 mph WNW | 0% |
| Thursday Night | 44°F | Mostly Cloudy then Patchy Fog | 1 to 9 mph NNE | 0% |
| Friday | 63°F | Patchy Fog then Mostly Sunny | 1 to 7 mph NNE | 0% |
| Friday Night | 46°F | Partly Cloudy | 1 to 6 mph ENE | 0% |
| Saturday | 66°F | Mostly Sunny | 1 to 5 mph S | 1% |
| Saturday Night | 49°F | Mostly Cloudy then Patchy Fog | 1 to 5 mph SSE | 16% |
| Sunday | 63°F | Patchy Fog then Mostly Cloudy | 0 to 6 mph S | 16% |
| Sunday Night | 48°F | Patchy Fog | 1 to 6 mph ENE | 17% |
| Monday | 62°F | Patchy Fog then Mostly Cloudy | 1 to 6 mph S | 17% |
| Monday Night | 46°F | Slight Chance Light Rain | 2 to 6 mph SSE | 20% |
| Tuesday | 64°F | Chance Light Rain | 1 to 6 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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Humboldt Hill
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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 4, 2026.