Upper Lake, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Upper Lake, a community in Lake County, California.

This Afternoon

65°F

Partly Sunny

Partly sunny. High near 65, with temperatures falling to around 61 in the afternoon. West northwest wind 5 to 10 mph, with gusts as high as 20 mph.

7-day forecast for Upper Lake

When	Temp	Forecast	Wind	Precip
This Afternoon	65°F	Partly Sunny	5 to 10 mph WNW	2%
Tonight	36°F	Partly Cloudy then Patchy Fog	1 to 8 mph W	2%
Thursday	72°F	Patchy Fog then Sunny	0 to 3 mph W	0%
Thursday Night	40°F	Mostly Clear	2 mph NNW	0%
Friday	76°F	Sunny	2 mph WSW	0%
Friday Night	43°F	Mostly Clear	0 mph	0%
Saturday	76°F	Sunny	0 to 3 mph SW	0%
Saturday Night	41°F	Mostly Clear	1 mph NNW	0%
Sunday	72°F	Mostly Sunny	0 to 3 mph WNW	0%
Sunday Night	41°F	Partly Cloudy then Patchy Fog	1 mph NW	0%
Monday	68°F	Patchy Fog then Mostly Sunny	0 to 3 mph WNW	3%
Monday Night	39°F	Partly Cloudy then Patchy Fog	0 to 3 mph NW	3%
Tuesday	69°F	Patchy Fog then Slight Chance Light Rain	0 to 5 mph WSW	15%
Tuesday Night	40°F	Slight Chance Light Rain	0 to 3 mph NE	23%

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

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

All California locations ›

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.