Washington Weather in September
27.1°C high · 15.2°C low · 95 mm rain · 6.9h sun
Sep is a warm month in Washington — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 27.1°C |
| Average low | 15.2°C |
| Rainfall | 95 mm |
| Sunshine | 6.9 hours/day |
| Daylight | 12.2 hours |
What to pack in September
Pack comfortable clothes with a light layer for evenings, plus a raincoat and umbrella for Washington in September.
Washington weather by month
JanFebMarAprMayJunJulAugSepOctNovDec
Frequently asked questions
What is the weather in Washington in September?
Highs of 27.1°C and lows of 15.2°C, with about 95 mm of rain and 6.9 hours of sunshine per day.
Is September a good time to visit Washington?
Sep is a warm month in Washington — not peak season, but a good time to avoid crowds.
What to do in Washington · Best time to visit Washington
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.