Weather forecast for: Clearlake CA
Last Update: 2:10 am PDT Sep 19, 2026
Today: Sunny, with a high near 90. Light west wind.
Tonight: Partly cloudy, with a low around 56. West wind around 6 mph becoming calm in the evening.
Sunday: Increasing clouds, with a high near 86. Calm wind becoming southeast around 6 mph in the afternoon.
Sunday Night: Cloudy, then gradually becoming partly cloudy, with a low around 56. Light south wind.
Monday: Sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.
Monday Night: Mostly clear, with a low around 55. West southwest wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Tuesday: Sunny, with a high near 90.
Tuesday Night: Clear, with a low around 56.
Wednesday: Sunny, with a high near 93.
Wednesday Night: Mostly clear, with a low around 58.
Thursday: Sunny, with a high near 92.
Thursday Night: Mostly clear, with a low around 56.
Friday: Mostly sunny, with a high near 87.