Upper Lake, CA Weather & Growing Conditions
Tonight
38°F
Chance Light Rain then Areas Of Fog
A chance of rain before 7pm, then areas of fog. Partly cloudy, with a low around 38. East wind 1 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Chance Light Rain then Areas Of Fog | 1 to 5 mph E | 28% |
| Wednesday | 64°F | Areas Of Fog then Mostly Sunny | 1 to 10 mph NW | 1% |
| Wednesday Night | 38°F | Partly Cloudy | 1 to 8 mph N | 0% |
| Thursday | 70°F | Sunny | 1 to 7 mph NE | 0% |
| Thursday Night | 42°F | Mostly Clear | 3 mph N | 0% |
| Friday | 74°F | Sunny | 3 mph NW | 0% |
| Friday Night | 46°F | Mostly Clear | 3 mph NNE | 0% |
| Saturday | 75°F | Sunny | 1 to 5 mph SE | 0% |
| Saturday Night | 44°F | Partly Cloudy | 3 mph NNW | 0% |
| Sunday | 72°F | Mostly Sunny | 1 to 5 mph NW | 0% |
| Sunday Night | 44°F | Mostly Cloudy | 3 mph NNW | 1% |
| Monday | 68°F | Partly Sunny | 0 to 5 mph WNW | 5% |
| Monday Night | 41°F | Partly Cloudy | 0 to 3 mph NNW | 4% |
| Tuesday | 69°F | Mostly Sunny then Slight Chance Light Rain | 0 to 5 mph SW | 17% |
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
9a
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 (15.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.