See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
12°
Mostly Cloudy
Feels Like: 11°
Min: 12°
Max: 16°
The next few hours will be overcast, with today reaching 16°C and dropping to 9°C. The coming days will be light rain
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:59
Sunrise
17:55
Sunset
Moon
Waxing Gibbous
17:22
Moonrise
04:54
Moonset
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View stargazing scoreWeather in San Mateo today, September 25, 2026
San Mateo starts September 25, 2026 looking damp, with rain in the forecast and wetter spells likely at times. Waterproof kit is the safer call for early plans. The morning carries the wetter risk, with rain chances near 100% and the highest odds around 10:00. Cloud is also thick early on, peaking near 94% around 11:00.
The day peaks near 16°C and cools toward 12°C. Expect humidity between 78% and 99%, most humid near 15:00. Airflow remains manageable, reaching about 2.2 km/h around 12:00.
Expect the wet theme to continue later, as rain odds reach 100% near 12:00. Cloud amounts hold near 100% around 18:00. Visibility holds near 9.6 km, though it can fall to 0.0 km. Expect sunrise at 05:59, sunset at 17:55, and 11 hours 56 minutes of sunlight today overall.
The practical takeaway for San Mateo on September 25, 2026 is simple: plan for rain, keep layers handy, and work around a high of about 16°C.
Frequently asked questions about weather in San Mateo
How warm does it get in San Mateo?
The warmest month in San Mateo is May, with average high temperatures of 23°C. The average temperature during this period is around 19°C.
How cold does it get in San Mateo?
The coldest month in San Mateo is January, with average low temperatures of 13°C. The average temperature during this period is around 17°C.
What is the wettest time of year in San Mateo?
The wettest month in San Mateo is May, with an average of 597mm of precipitation.
What is the driest time of year in San Mateo?
The driest month in San Mateo is January, with an average of 35mm of precipitation.
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