Rancho Cucamonga, California Weather:
Saturday, September 19, 2026
Sunny Weather
Day 88°
Night 64°
Precipitation 1 %
Wind 6 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 19, 2025)
Night

Day

88°

Night

64°

Wind

6 mph

Precipitation

4 %