Rancho Cucamonga, California Weather:
Sunday, September 20, 2026
Sunny Weather
Day 86°
Night 66°
Precipitation 2 %
Wind 6 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 20, 2025)
Night

Day

90°

Night

63°

Wind

5 mph

Precipitation

0 %