Weather Forecast and Radar for Thornton, Colorado

Weather in Thornton, CO

Thornton, Colorado, United States has a semi-arid climate with mild winters and hot summers. The average high temperature in the summer months (June, July, and August) is 86°F, with temperatures often reaching into the upper 90s and occasionally reaching 100°F. The average low temperature in the summer months is 57°F. The average high temperature in the winter months (December, January, and February) is 43°F, with temperatures occasionally dropping into the teens. The average low temperature in the winter months is 18°F.

Spring in Thornton typically starts in March and lasts until May. The average high temperature during this time is 62°F, with temperatures occasionally reaching the mid-70s. The average low temperature during this time is 33°F.

Fall in Thornton typically starts in September and lasts until November. The average high temperature during this time is 69°F, with temperatures occasionally reaching the mid-80s. The average low temperature during this time is 41°F.

Fast Facts About Thornton, CO

As of 2020, the city population is 144186.

Major Cities Nearby Thornton, CO

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Thornton, Colorado.