See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
32°
Rain
Feels Like: 39°
Min: 25°
Max: 33°
The next few hours will be mostly clear, with today reaching 33°C and dropping to 24°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
06:11
Sunrise
18:14
Sunset
Moon
Waxing Crescent
09:45
Moonrise
20:49
Moonset
Daily Forecast
Today
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
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Weather in San Mateo today, September 15, 2026
San Mateo starts September 15, 2026 looking damp, with rain in the forecast and wetter spells likely at times. Waterproof kit is the safer call for early plans.
Temperatures climb from an overnight low near 25°C toward a daytime high of about 33°C. Moisture in the air spans 57%-95%, with the highest values around 17:00. Expect gentle winds, highest near 14:00 at 2.1 km/h.
Expect the wet theme to continue later, as rain odds reach 98% near 15:00. Cloud amounts hold near 77% around 14:00. Visibility stays generally good near 15.6 km on average, though it can drop toward 13.1 km in thicker cloud or showers. Daylight runs from 06:11 to 18:14, lasting 12 hours 3 minutes of sunlight today.
Taken together, San Mateo looks wet enough on September 15, 2026 that flexible outdoor plans work best, with temperatures peaking near 33°C.
Frequently asked questions about weather in San Mateo
How warm does it get in San Mateo?
The warmest month in San Mateo is April, with average high temperatures of 36°C. The average temperature during this period is around 29°C.
How cold does it get in San Mateo?
The coldest month in San Mateo is January, with average low temperatures of 22°C. The average temperature during this period is around 28°C.
What is the wettest time of year in San Mateo?
The wettest month in San Mateo is August, with an average of 162mm of precipitation.
What is the driest time of year in San Mateo?
The driest month in San Mateo is February, with an average of 9mm of precipitation.
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