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Upper Lake, CA Weather Forecast
Upper Lake, CA Weather Forecast Dated: 440 AM Fri Sep 18 2026
Expect a mild stretch with plenty of sunshine and mostly dry weather over the coming period. comfortable humidity and no major pressure swings will dominate.
Friday, September 18, 2026
Mid-Morning
65°F 18°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
70°F 21°C
Sunny
Warm and summery near 81°F 27°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the ENE to the NW at 7 mph 12 km/h.
Saturday, September 19, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
86°F 30°C
Cloudy
Early-Evening
72°F 22°C
Sunny
Balmy with temperatures reaching 86°F 30°C, sunny in the morning, cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds switching from the ESE to the NW at 8 mph 12 km/h.
Sunday, September 20, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
85°F 29°C
Sunny
Early-Evening
71°F 22°C
Overcast
Quite warm around 85°F 29°C, sunny through the afternoon, turning cloudy this evening, with increasing humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
87°F 30°C
Partly Cloudy
Early-Evening
75°F 24°C
Sunny
Warm temperatures up to 87°F 30°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds moving from the ESE to the WNW at 8 mph 12 km/h.
Tuesday, September 22, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
87°F 31°C
Overcast
Early-Evening
76°F 24°C
Overcast
Very warm with a high of 87°F 31°C, sunny in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds swinging from the ESE to the WNW at 6 mph 9 km/h.
Wednesday, September 23, 2026
Mid-Morning
72°F 22°C
Overcast
Mid-Afternoon
87°F 31°C
Overcast
Early-Evening
77°F 25°C
Overcast
Warm and summery near 87°F 31°C, overcast throughout the day, with lower humidity and steady pressure. Winds shifting from the E to the WNW at 5 mph 8 km/h.
Thursday, September 24, 2026
Mid-Morning
73°F 23°C
Partly Cloudy
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
69°F 20°C
Partly Cloudy
Balmy with temperatures reaching 82°F 28°C, cloudy in the morning, overcast in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds SW at 11 mph 17 km/h.
Friday, September 25, 2026
Mid-Morning
52°F 11°C
Overcast
Mid-Afternoon
58°F 15°C
Sunny
Early-Evening
50°F 10°C
Sunny
Cool with a high near 58°F 15°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds switching from the W to the WNW at 11 mph 18 km/h.
Saturday, September 26, 2026
Mid-Morning
51°F 11°C
Sunny
Mid-Afternoon
64°F 18°C
Sunny
Early-Evening
55°F 13°C
Sunny
Refreshing around 64°F 18°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the NW to the WNW at 8 mph 13 km/h.
Sunday, September 27, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
58°F 15°C
Sunny
Mild with a high of 68°F 20°C, cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and barometric pressure falling.
Monday, September 28, 2026
Mid-Morning
60°F 15°C
Sunny
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
65°F 18°C
Sunny
Pleasant near 73°F 23°C, sunny throughout the day, with steady humidity and steady pressure. Winds swinging from the NNE to the NW at 7 mph 11 km/h.
Tuesday, September 29, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
69°F 21°C
Sunny
Balmy with temperatures reaching 81°F 27°C, sunny throughout the day, with steady humidity and steady pressure.
Wednesday, September 30, 2026
Mid-Morning
64°F 18°C
Sunny
Mid-Afternoon
78°F 26°C
Sunny
Early-Evening
68°F 20°C
Sunny
Enjoyable around 78°F 26°C, sunny throughout the day, with steady humidity and steady pressure. Winds shifting from the ENE to the WNW at 5 mph 8 km/h.
Thursday, October 1, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
70°F 21°C
Sunny
Warm temperatures up to 81°F 27°C, sunny throughout the day, with steady humidity and steady pressure.
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