Tomorrow | Weather | Ontario, California

Active Weather Warnings
Monday, May 11, 2026
Sunny Weather
Day 93°
Night 61°
Precipitation 1 %
Wind 8 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (May 11, 2025)
Cloudy Weather

Day

93°

Night

59°

Wind

7 mph

UV Index

11

Precipitation

1 %

Weather Alerts and Warnings for

Moderate Expected Likely

Heat Advisory

Heat Advisory issued May 9 at 8:25PM PDT until May 11 at 8:00PM PDT by NWS San Diego CA
May 11, 10:00 AM May 11, 8:00 PM
WHAT: Temperatures 95 to 101 degrees.

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

WHEN: From 10 AM to 8 PM PDT Monday.

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: May 10, 2:50 AM Source: NWS Alert