Upper Lake, CA Weather & Growing Conditions
Tonight
55°F
Mostly Clear
Mostly clear, with a low around 55. North wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Mostly Clear | 7 mph N | 0% |
| Saturday | 86°F | Sunny | 2 to 8 mph NW | 0% |
| Saturday Night | 56°F | Mostly Cloudy | 3 to 8 mph NNW | 0% |
| Sunday | 84°F | Partly Sunny | 6 mph SSW | 0% |
| Sunday Night | 57°F | Mostly Cloudy | 6 mph NNW | 0% |
| Monday | 86°F | Sunny | 3 to 8 mph W | 0% |
| Monday Night | 57°F | Mostly Clear | 3 to 8 mph NNW | 0% |
| Tuesday | 87°F | Sunny | 3 to 7 mph W | 0% |
| Tuesday Night | 57°F | Mostly Clear | 7 mph NNW | 0% |
| Wednesday | 88°F | Sunny | 7 mph W | 0% |
| Wednesday Night | 59°F | Mostly Clear | 7 mph NNW | 0% |
| Thursday | 88°F | Sunny | 5 to 8 mph SSW | 0% |
| Thursday Night | 57°F | Partly Cloudy | 5 to 8 mph NW | 1% |
| Friday | 82°F | Mostly Sunny | 5 to 8 mph WNW | 1% |
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 Sep 19, 2026.