Sunnyvale, California Weather:
Tuesday, September 15, 2026
Cloudy Weather
Day 79°
Night 55°
Precipitation 1 %
Wind 8 mph
UV Index (0 - 11+) 6
Weather Forecast History
Last Year's Weather on This Day (September 15, 2025)
Night

Day

90°

Night

63°

Wind

4 mph

Precipitation

0 %