Upper Lake, CA Weather & Growing Conditions
Overnight
68°F
Clear
Clear. Low around 68, with temperatures rising to around 73 overnight. North wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Clear | 3 mph N | 0% |
| Tuesday | 99°F | Sunny | 2 to 10 mph WNW | 0% |
| Tuesday Night | 67°F | Mostly Clear | 2 to 10 mph NNW | 0% |
| Wednesday | 97°F | Sunny | 2 to 7 mph S | 0% |
| Wednesday Night | 64°F | Clear | 3 to 7 mph NNW | 0% |
| Thursday | 96°F | Sunny | 3 to 8 mph S | 0% |
| Thursday Night | 64°F | Mostly Clear | 2 to 8 mph NNW | 0% |
| Friday | 98°F | Sunny | 2 to 9 mph SW | 0% |
| Friday Night | 66°F | Clear | 2 to 9 mph NNW | 0% |
| Saturday | 98°F | Sunny | 2 to 10 mph WNW | 0% |
| Saturday Night | 64°F | Mostly Clear | 7 to 10 mph NW | 0% |
| Sunday | 93°F | Sunny | 5 to 9 mph WNW | 0% |
| Sunday Night | 60°F | Mostly Clear | 5 to 9 mph NW | 0% |
| Monday | 89°F | Sunny | 5 to 9 mph SSW | 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
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 Aug 4, 2026.