Air quality index62Moderate

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

Next 24 hours

US AQI

64Now
63
60
5611 PM
53
50
462 AM
43
43
425 AM
41
42
438 AM
43
44
4611 AM
47
48
482 PM
49
49
495 PM
49
49

Air quality outlook

Worst hour each day

Today67Moderate
Sat 1753Moderate
Sun 18100Moderate
Mon 19118Unhealthy for sensitive groups
Tue 20100Moderate

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

Live radar

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About San Marcos weather

San Marcos is in San Diego County, California, United States at 33.14°, -117.17°. Right now it’s 86° and clear; today’s high is 92° with a 2% 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.