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Thornton, Colorado Weather:
Sunday, September 21, 2025
Sunny WeatherSunny weather, clear skies and sunny weather.
Day 88°
Night 54°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 11

Weather Forecast History

Last Year's Weather on This Day (September 21, 2024)

Sunny with a Chance of ThunderstormsSunny weather with a possibility of isolated thunderstorms developing later in the day.

Day

70°

Night

43°

Wind

14 mph

UV Index

5

Precipitation

65