Boulder, Colorado Weather:
Saturday, September 12, 2026
Sunny Weather
Day 82°
Night 54°
Precipitation 20 %
Wind 4 mph
UV Index (0 - 11+) 6
Weather Forecast History
Last Year's Weather on This Day (September 12, 2025)
Stormy Weather

Day

81°

Night

57°

Wind

6 mph

Precipitation

49 %