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San Mateo County, CA Weather Forecast
San Mateo County, CA Weather Forecast Dated: 246 AM Tue Sep 01 2026 (San Mateo County Time)
Expect a mild stretch with plenty of sunshine and mostly dry weather over the next two weeks. generally humid conditions and no major pressure swings will dominate.
Tuesday, September 1, 2026
Mid-Morning
61°F 16°C
Scattered Showers
Mid-Afternoon
67°F 20°C
Sunny
Early-Evening
60°F 15°C
Overcast
Cool with a mix of sun and clouds, steady humidity and steady pressure. Winds shifting from WSW to SW at 9 mph 14 km/h.
Wednesday, September 2, 2026
Mid-Morning
61°F 16°C
Scattered Showers
Mid-Afternoon
70°F 21°C
Cloudy
Early-Evening
61°F 16°C
Sunny
Warm with mostly cloudy skies, steady humidity and steady pressure. Winds shifting from S to WSW at 7 mph 11 km/h.
Thursday, September 3, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
71°F 22°C
Partly Cloudy
Early-Evening
63°F 18°C
Partly Cloudy
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, increasing humidity and barometric pressure falling. Winds shifting from SW to W at 6 mph 10 km/h.
Friday, September 4, 2026
Mid-Morning
63°F 17°C
Scattered Showers
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
59°F 15°C
Sunny
Cool with a mix of sun and clouds, lower humidity and steady pressure. Winds W at 13 mph 21 km/h.
Saturday, September 5, 2026
Mid-Morning
58°F 15°C
Sunny
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
59°F 15°C
Sunny
Cool with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure. Winds WNW at 8 mph 13 km/h.
Sunday, September 6, 2026
Mid-Morning
59°F 15°C
Sunny
Mid-Afternoon
70°F 21°C
Overcast
Early-Evening
64°F 18°C
Overcast
Warm with overcast skies, lower humidity and steady pressure.
Monday, September 7, 2026
Mid-Morning
69°F 21°C
Overcast
Mid-Afternoon
79°F 26°C
Overcast
Early-Evening
70°F 21°C
Overcast
Warm with overcast skies, steady humidity and steady pressure.
Tuesday, September 8, 2026
Mid-Morning
64°F 18°C
Partly Cloudy
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
67°F 20°C
Sunny
Warm with mostly cloudy skies in the morning, partly sunny in the afternoon, and mostly sunny in the evening, steady humidity and steady pressure. Winds shifting from WNW to W at 5 mph 8 km/h.
Wednesday, September 9, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
77°F 25°C
Sunny
Early-Evening
67°F 20°C
Sunny
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure.
Thursday, September 10, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
75°F 24°C
Sunny
Early-Evening
64°F 18°C
Sunny
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure. Winds shifting from W to WSW at 5 mph 9 km/h.
Friday, September 11, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
63°F 18°C
Partly Cloudy
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure. Winds WNW at 9 mph 14 km/h.
Saturday, September 12, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
71°F 22°C
Sunny
Early-Evening
62°F 17°C
Sunny
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure. Winds shifting from W to WSW at 6 mph 9 km/h.
Sunday, September 13, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
76°F 24°C
Partly Cloudy
Early-Evening
65°F 19°C
Sunny
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure. Winds shifting from WNW to WSW at 5 mph 8 km/h.
Monday, September 14, 2026
Mid-Morning
65°F 19°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
69°F 20°C
Sunny
Warm with mostly sunny skies in the morning, then mostly sunny for the afternoon and evening, steady humidity and steady pressure. Winds shifting from ESE to WSW at 6 mph 10 km/h.
San Mateo County, CA Weather Radar Map
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