Rancho Cucamonga, California Weather:
Active Weather Warnings
Saturday, August 8, 2026
Cloudy Weather
Day 97°
Night 72°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (August 8, 2025)
Night

Day

97°

Night

66°

Wind

5 mph

Precipitation

0 %

Weather Alerts and Warnings for

Moderate Expected Likely

Heat Advisory

Heat Advisory issued August 4 at 9:35PM PDT until August 8 at 8:00PM PDT by NWS San Diego CA
Aug 4, 9:35 PM Aug 8, 8:00 PM
WHAT: High temperatures in the upper 90s to 105 expected.

WHERE: San Bernardino and Riverside County Valleys-The Inland
Empire.

WHEN: Until 8 PM PDT Saturday.

IMPACTS: Hot temperatures may cause heat illnesses.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Updated: Aug 5, 2:02 AM Source: NWS Alert