Month-by-month travel weather
Washington, DC September weather
Washington, DC, United States · September
Think ‘light by day, layer at night’
September often feels more comfortable than mid-summer, though afternoons can still be warm.
Evenings cool down faster, and a light jacket becomes useful again.
September averages at a glance
Average low
around 17–19°C
Average high
around 26–29°C
Average precipitation
around 70–105 mm
Rainy days
about 6–10 days
What to wear in September in Washington, DC
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Light clothing by day + thin layer at night.
- • Optional rain option.
- • Comfortable walking shoes.
Travel tips for visiting Washington, DC in September
- • Great month for longer walks—just plan the night layer.
- • Rain can still appear; keep flexibility.
September weather in Washington, DC — FAQ
Q. Is September a good time to visit?
A. Often yes—comfortable days with cooler evenings.
Q. Does it still rain?
A. Yes, rain is still possible, though humidity often eases.
Explore Washington, DC
These pages are connected so you can compare conditions and decide for yourself.