Longmont, Colorado Weather:
Monday, September 21, 2026
Cloudy Weather
Day 75°
Night 48°
Precipitation 5 %
Wind 7 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Rainy Night

Day

82°

Night

52°

Wind

5 mph

Precipitation

49 %