Month-by-month travel weather
Denver September weather
Denver, United States · September
Light by day, layer at night
Many days feel comfortable; evenings cool quickly and a light jacket becomes useful.
September averages at a glance
Average low
around 9–11°C
Average high
around 25–28°C
Average precipitation
around 15–30 mm
Rainy days
about 3–6 days
What to wear in September in Denver
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Light clothing by day + thin jacket at night
- • Optional lip care
Travel tips for visiting Denver in September
- • Dry air can dry lips—carry lip balm if needed.
September weather in Denver — FAQ
Q. Is September a good month to visit?
A. Often yes—comfortable days with cooler evenings.
Explore Denver
These pages are connected so you can compare conditions and decide for yourself.