See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
24°
Humid and Partly Cloudy
Feels Like: 23°
Min: 24°
Max: 30°
The next few hours will be humid and mostly cloudy, with today reaching 30°C and dropping to 23°C. The coming days will be drizzle
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:45
Sunrise
17:49
Sunset
Moon
Waxing Crescent
09:59
Moonrise
21:17
Moonset
Daily Forecast
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
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Weather in San Mateo today, September 16, 2026
Rain features in San Mateo on September 16, 2026, so keep waterproofs handy through the day. The damp theme is strongest where shower chances rise. Morning plans should assume damp conditions, as rain chances climb toward 24% around 05:00. Cloud cover is also at its densest near 05:00 at roughly 57%.
The temperature range runs from about 24°C up to 30°C. The air stays humid, with relative humidity between 72% and 98% and the peak around 05:00. Winds stay light, near 2.6 km/h by 14:00, so the day feels still more than breezy.
Afternoon showers stay in play, peaking near 100% around 15:00. Skies remain cluttered, with cover about 94% by 20:00. Visibility stays generally good near 16.1 km on average, though it can drop toward 15.4 km in thicker cloud or showers. Daylight runs from 05:45 to 17:49, lasting 12 hours 4 minutes of sunlight today.
In short, treat September 16, 2026 in San Mateo as a damp day: pack covers, watch the wetter hours, and expect a high near 30°C.
Frequently asked questions about weather in San Mateo
How warm does it get in San Mateo?
The warmest month in San Mateo is June, with average high temperatures of 34°C. The average temperature during this period is around 28°C.
How cold does it get in San Mateo?
The coldest month in San Mateo is February, with average low temperatures of 20°C. The average temperature during this period is around 23°C.
What is the wettest time of year in San Mateo?
The wettest month in San Mateo is August, with an average of 364mm of precipitation.
What is the driest time of year in San Mateo?
The driest month in San Mateo is April, with an average of 80mm of precipitation.
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