Rialto, California Weather:
Thursday, September 17, 2026
Sunny Weather
Day 86°
Night 61°
Precipitation 1 %
Wind 5 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 17, 2025)
Rainy Weather

Day

95°

Night

68°

Wind

5 mph

Precipitation

69 %