Denver Weather in September

During September, Denver experiences high daytime temperatures of 25°C (77°F) and cooler nights around 14°C (57°F). Expect quite a bit of rainfall. Around 113 mm (4.4 in) is typical.

Rainfall in Denver in September

Records from the past 30 years suggest around 10 days of rain, with 113 mm (4.4 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Denver in September

In September, expect high temperatures in Denver, with highs of 25°C (77°F) and lows of 14°C (57°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Denver in September

Enjoy a sunny month with about 226 hours of sunshine, the clear skies make Denver even more beautiful.

For Denver itself, May generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.