Air quality index62Moderate

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

Next 24 hours

US AQI

67Now
60
52
459 PM
43
41
3912 AM
39
38
373 AM
41
44
476 AM
49
51
539 AM
50
48
4512 PM
54
63
733 PM
73
74

Air quality outlook

Worst hour each day

Today67Moderate
Sat 1775Moderate
Sun 1841Good
Mon 1941Good
Tue 2043Good

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

Live radar

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About Castro Valley weather

Castro Valley is in Alameda County, California, United States at 37.69°, -122.09°. Right now it’s 83° and clear; today’s high is 88° 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.