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
86°F
Sunny
Sunny, with a high near 86. West northwest wind 6 to 9 mph.
7-day forecast for Upper Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 86°F | Sunny | 6 to 9 mph WNW | 0% |
| Tonight | 51°F | Mostly Clear | 2 to 9 mph N | 0% |
| Saturday | 91°F | Sunny | 1 to 7 mph W | 0% |
| Saturday Night | 53°F | Partly Cloudy | 1 to 7 mph NNW | 0% |
| Sunday | 90°F | Mostly Sunny | 1 to 5 mph SSE | 0% |
| Sunday Night | 53°F | Partly Cloudy | 0 to 5 mph WNW | 0% |
| Monday | 92°F | Sunny | 0 to 8 mph W | 0% |
| Monday Night | 54°F | Mostly Clear | 0 to 8 mph NW | 0% |
| Tuesday | 93°F | Sunny | 0 to 7 mph W | 0% |
| Tuesday Night | 54°F | Mostly Clear | 0 to 7 mph NW | 0% |
| Wednesday | 94°F | Sunny | 0 to 7 mph SW | 0% |
| Wednesday Night | 55°F | Mostly Clear | 0 to 7 mph NW | 0% |
| Thursday | 92°F | Mostly Sunny | 0 to 8 mph W | 1% |
| Thursday Night | 53°F | Partly Cloudy | 1 to 8 mph NW | 1% |
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
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Lakeport
Lower Lake
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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 Sep 19, 2026.