Rancho Cucamonga, California Weather:
Friday, September 4, 2026
Sunny Weather
Day 97°
Night 68°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 8
Weather Forecast History
Last Year's Weather on This Day (September 4, 2025)
Night

Day

97°

Night

66°

Wind

5 mph

Precipitation

0 %