Upper Lake, CA Weather Forecast

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Upper Lake, CA Weather Forecast

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Upper Lake CA weather  - Clear - 91°F
Clear
91°F
Updated 2:36 pm
Feels Like 77°F
Humidity 22%
Wind VRB 3 mph
Barometer  29.93 in
Dew Point 48°F
Upper Lake CA weather  - Clear - 33°C
Clear
33°C
Updated 2:36 pm
Feels Like 25°C
Humidity 22%
Wind VRB 5 km/h
Barometer  101.4 kPa
Dew Point 9°C

Upper Lake Weather Forecast

TODAY TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY THURSDAY THURSDAY NIGHT FRIDAY
Upper Lake, CA Weather - Today Sunny Upper Lake, CA Weather - Tonight Partly Cloudy Upper Lake, CA Weather - Sunday Mostly Cloudy Upper Lake, CA Weather - Sunday Night Mostly Cloudy Upper Lake, CA Weather - Monday Sunny Upper Lake, CA Weather - Monday Night Mostly Clear Upper Lake, CA Weather - Tuesday Clear Upper Lake, CA Weather - Tuesday Night Clear Upper Lake, CA Weather - Wednesday Mostly Clear Upper Lake, CA Weather - Thursday Mostly Clear Upper Lake, CA Weather - Thursday Night Partly Cloudy Upper Lake, CA Weather - Friday Partly Cloudy
Sunny Partly Cloudy Mostly Cloudy Mostly Cloudy Sunny Mostly Clear Clear Clear Mostly Clear Mostly Clear Partly Cloudy Partly Cloudy
Hi: 88°FHi: 31°C
Lo: 60°FLo: 16°C Hi: 87°FHi: 31°C
Lo: 61°FLo: 16°C Hi: 88°FHi: 31°C
Lo: 60°FLo: 16°C Hi: 89°FHi: 32°C
Lo: 61°FLo: 16°C
Hi: 89°FHi: 32°C
Lo: 61°FLo: 16°C
Hi: 90°FHi: 32°C
Lo: 62°FLo: 17°C
Hi: 90°FHi: 32°C
Lo: 62°FLo: 17°C
Hi: 87°FHi: 31°C
Lo: 62°FLo: 17°C
Hi: 87°FHi: 31°C
Lo: 62°FLo: 17°C
POP = Probability of Precipitation.
Weather Outlook Updated: 136 AM PDT Sat Sep 19 2026 Upper Lake, CA Weather - WeatherWorld.com

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Upper Lake Forecast Discussion

Meteorlogic Glosserator
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Issued: 1215 AM PDT Sat Sep 19 2026

Key Messages

  • Warmer and drier interior temperatures into the weekend with highs in the 90s by Sunday.
  • A shallow but strong marine layer forming close to shore with persistent marine clouds.
  • Similar warm and dry conditions early next week with potential clearing near shore by Monday.

Discussion

...High pressure will continue to grow through the weekend. Extensive marine stratus remains along the coast overnight and should last through most of the weekend with clearing each afternoon not likely. Dayt...