Upper Lake, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Upper Lake, a community in Lake County, California.
Overnight
61°F
Clear
Clear. Low around 61, with temperatures rising to around 66 overnight. Wind around 0 mph.
7-day forecast for Upper Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Clear | 0 mph | 0% |
| Tuesday | 104°F | Sunny | 0 to 10 mph SSW | 0% |
| Tuesday Night | 63°F | Mostly Clear | 0 to 8 mph NW | 0% |
| Wednesday | 103°F | Sunny | 0 to 10 mph S | 0% |
| Wednesday Night | 61°F | Clear | 0 to 8 mph WSW | 0% |
| Thursday | 104°F | Sunny | 0 to 8 mph SSW | 0% |
| Thursday Night | 61°F | Mostly Clear | 0 to 8 mph WNW | 0% |
| Friday | 105°F | Sunny | 0 to 9 mph SW | 0% |
| Friday Night | 63°F | Clear | 0 to 9 mph NW | 0% |
| Saturday | 104°F | Sunny | 0 to 9 mph W | 0% |
| Saturday Night | 61°F | Mostly Clear | 2 to 9 mph NW | 0% |
| Sunday | 100°F | Sunny | 2 to 8 mph W | 0% |
| Sunday Night | 57°F | Mostly Clear | 0 to 8 mph NW | 0% |
| Monday | 96°F | Sunny | 0 to 8 mph S | 0% |
Forecast source: National Weather Service (api.weather.gov) for Upper Lake (39.165, -122.905). Updated through the day.
Growing snapshot for Upper Lake
Last spring frost
Apr 8
First fall frost
Nov 6
Growing season
211 days
Hardiness zone
9a
More local growing data for Upper Lake: nearby ZIP 95485 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Clearlake
Clearlake Oaks
Clearlake Riviera
Cobb
Hidden Valley Lake
Kelseyville
Lakeport
Lower Lake
Lucerne
Middletown
Nice
North Lakeport
Soda Bay
Spring Valley
Climate data from the nearest NOAA station, Potter Valley Powerhouse, Ca (15.2 mi from Upper Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.