See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
29°
Mostly Cloudy
Feels Like: 35°
Min: 24°
Max: 30°
The next few hours will be mostly cloudy, with today reaching 30°C and dropping to 24°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
05:47
Sunrise
17:53
Sunset
Moon
Waxing Crescent
19:19
Moonset
Daily Forecast
Today
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
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Weather in San Mateo today, September 13, 2026
Rain features in San Mateo on September 13, 2026, so keep waterproofs handy through the day. The damp theme is strongest where shower chances rise. The first half of the day looks overcast, as cloud amounts reach about 70% around 11:00. Brighter weather, if it comes, waits until later.
Expect highs of 30°C and cooler readings close to 24°C. The air stays humid, with relative humidity between 71% and 96% and the peak around 22:00. Airflow remains manageable, reaching about 2.5 km/h around 10:00.
Expect the wet theme to continue later, as rain odds reach 100% near 15:00. Cloud amounts hold near 93% around 20:00. Horizontal visibility sits around 14.6 km, briefly nearer 8.2 km. Sunrise is at 05:47 and sunset at 17:53, giving 12 hours 6 minutes of sunlight today.
The practical takeaway for San Mateo on September 13, 2026 is simple: plan for rain, keep layers handy, and work around a high of about 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 May, with average high temperatures of 33°C. The average temperature during this period is around 30°C.
How cold does it get in San Mateo?
The coldest month in San Mateo is February, with average low temperatures of 24°C. The average temperature during this period is around 27°C.
What is the wettest time of year in San Mateo?
The wettest month in San Mateo is July, with an average of 540mm of precipitation.
What is the driest time of year in San Mateo?
The driest month in San Mateo is March, with an average of 14mm of precipitation.
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