Rancho Cucamonga, California Weather:
Tuesday, September 15, 2026
Cloudy Weather
Day 88°
Night 63°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 15, 2025)
Night

Day

93°

Night

68°

Wind

5 mph

Precipitation

0 %