Upper Lake, CA Weather & Growing Conditions
Overnight
66°F
Clear
Clear. Low around 66, with temperatures rising to around 71 overnight. East southeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Clear | 2 mph ESE | 0% |
| Tuesday | 103°F | Sunny | 2 to 10 mph S | 0% |
| Tuesday Night | 65°F | Mostly Clear | 0 to 10 mph N | 0% |
| Wednesday | 101°F | Sunny | 0 to 10 mph SSE | 0% |
| Wednesday Night | 62°F | Clear | 0 to 7 mph NW | 0% |
| Thursday | 100°F | Sunny | 0 to 8 mph SSW | 0% |
| Thursday Night | 62°F | Mostly Clear | 0 to 8 mph NW | 0% |
| Friday | 102°F | Sunny | 0 to 8 mph WSW | 0% |
| Friday Night | 65°F | Clear | 0 to 8 mph NW | 0% |
| Saturday | 102°F | Sunny | 0 to 9 mph WNW | 0% |
| Saturday Night | 63°F | Mostly Clear | 3 to 9 mph NW | 0% |
| Sunday | 97°F | Sunny | 3 to 8 mph W | 0% |
| Sunday Night | 58°F | Mostly Clear | 1 to 8 mph NW | 0% |
| Monday | 94°F | Sunny | 1 to 8 mph S | 0% |
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 Aug 4, 2026.