Upper Lake, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Upper Lake, a community in Lake County, California.
Tonight
38°F
Patchy Fog
Patchy fog. Mostly cloudy. Low around 38, with temperatures rising to around 43 overnight. Northwest wind around 1 mph.
7-day forecast for Upper Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Patchy Fog | 1 mph NW | 1% |
| Wednesday | 65°F | Patchy Fog then Partly Sunny | 0 to 10 mph W | 1% |
| Wednesday Night | 36°F | Partly Cloudy then Areas Of Fog | 1 to 7 mph SW | 0% |
| Thursday | 71°F | Patchy Fog then Sunny | 1 to 7 mph SSW | 0% |
| Thursday Night | 40°F | Mostly Clear | 0 to 7 mph WNW | 0% |
| Friday | 75°F | Sunny | 2 mph W | 0% |
| Friday Night | 44°F | Mostly Clear | 1 mph NNW | 0% |
| Saturday | 77°F | Sunny | 0 to 3 mph SSW | 0% |
| Saturday Night | 42°F | Partly Cloudy | 1 mph NNW | 0% |
| Sunday | 73°F | Mostly Sunny | 0 to 5 mph WNW | 0% |
| Sunday Night | 42°F | Mostly Cloudy then Areas Of Fog | 2 mph NW | 1% |
| Monday | 70°F | Areas Of Fog then Partly Sunny | 0 to 5 mph WNW | 4% |
| Monday Night | 40°F | Partly Cloudy then Areas Of Fog | 0 to 3 mph NW | 4% |
| Tuesday | 71°F | Areas Of Fog then Slight Chance Light Rain | 0 to 3 mph SW | 17% |
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 Nov 4, 2026.