See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
22°
Partly Cloudy
Feels Like: 21°
Min: 22°
Max: 31°
The next few hours will be mostly cloudy, with today reaching 31°C and dropping to 22°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
06:22
Sunrise
18:25
Sunset
Moon
Waxing Crescent
09:57
Moonrise
21:00
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 looks damp on September 15, 2026, so plan for wet spells during the day. Early travel and outdoor time should assume rain can arrive quickly. The first half of the day looks overcast, as cloud amounts reach about 79% around 11:00. Brighter weather, if it comes, waits until later.
Temperatures climb from an overnight low near 22°C toward a daytime high of about 31°C. Expect humidity between 59% and 95%, most humid near 20:00. Expect gentle winds, highest near 14:00 at 2.9 km/h.
Expect the wet theme to continue later, as rain odds reach 94% near 15:00. Cloud amounts hold near 93% around 20:00. Expect visibility near 14.0 km, with poorer spells close to 4.4 km. Sunrise is at 06:22 and sunset at 18:25, giving 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 31°C.
Frequently asked questions about weather in San Mateo
How warm does it get in San Mateo?
The warmest month in San Mateo is September, with average high temperatures of 29°C. The average temperature during this period is around 25°C.
How cold does it get in San Mateo?
The coldest month in San Mateo is January, with average low temperatures of 19°C. The average temperature during this period is around 22°C.
What is the wettest time of year in San Mateo?
The wettest month in San Mateo is April, with an average of 195mm of precipitation.
What is the driest time of year in San Mateo?
The driest month in San Mateo is February, with an average of 66mm of precipitation.
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