Upper Lake, CA Weather & Growing Conditions
Today
60°F
Patchy Fog then Mostly Sunny
Patchy fog before 10am. Mostly sunny. High near 60, with temperatures falling to around 55 in the afternoon. North northwest wind 2 to 12 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Patchy Fog then Mostly Sunny | 2 to 12 mph NNW | 2% |
| Tonight | 39°F | Partly Cloudy | 6 to 12 mph NW | 2% |
| Thursday | 68°F | Sunny | 3 to 7 mph NW | 0% |
| Thursday Night | 43°F | Mostly Clear | 6 mph N | 0% |
| Friday | 71°F | Sunny | 5 mph NW | 0% |
| Friday Night | 47°F | Mostly Clear | 2 to 6 mph NNE | 0% |
| Saturday | 72°F | Sunny | 5 mph SSE | 0% |
| Saturday Night | 45°F | Partly Cloudy | 2 to 6 mph NNW | 0% |
| Sunday | 67°F | Mostly Sunny | 5 mph NW | 0% |
| Sunday Night | 45°F | Partly Cloudy | 5 mph N | 0% |
| Monday | 63°F | Mostly Sunny | 5 mph NNW | 3% |
| Monday Night | 43°F | Partly Cloudy | 6 mph NNW | 4% |
| Tuesday | 64°F | Slight Chance Light Rain | 5 mph W | 16% |
| Tuesday Night | 45°F | Slight Chance Light Rain | 3 to 8 mph NE | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Upper Lake, CA
Last spring frost
Apr 8
First fall frost
Nov 6
Growing season
211 days
Hardiness zone
8b
Explore more for Upper Lake, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Potter Valley Powerhouse, Ca (12.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.