Colorado In September 2024 Temperature. This report shows the past weather for littleton, providing a weather history for september 2024. In denver, the average temperature for september is around 63.1°f (17.3°c).
During october, the average contiguous u.s. This page contains a list of the average monthly high and low temperatures in colorado springs, colorado for the month of september each year between 1948 and 2024.