Air quality index57Moderate

Acceptable for most people; unusually sensitive people should take it easier outdoors.

Next 24 hours

US AQI

59Now
58
56
559 PM
52
50
4712 AM
45
43
413 AM
42
43
436 AM
43
43
439 AM
43
42
4112 PM
38
35
313 PM
37
42

Air quality outlook

Worst hour each day

Today59Moderate
Sat 1747Good
Sun 1839Good
Mon 1939Good
Tue 2041Good

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

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About San Mateo weather

San Mateo is in San Mateo County, California, United States at 37.56°, -122.33°. Right now it’s 79° and mostly clear; today’s high is 90° with a 0% chance of rain.

California encompasses an extraordinary range of climates, from the Mediterranean coast to alpine peaks, scorching deserts, and temperate rainforests. The state's Central Valley is one of the most productive agricultural regions in the world, benefiting from warm, dry summers and mild, wet winters. Death Valley holds the record for the highest reliably recorded air temperature on Earth at 134 degrees Fahrenheit.