Washington, D.C., District of Columbia Weather in September
United States · September climate averages and travel tips
Avg high27°C (80°F)
Avg low17°C (62°F)
Rainfall103 mm (4.1 in)
RatingExcellent 8.4/10
Expect hot days in Washington, D.C. in September: the average high is 27°C (80°F) and the average low is 17°C (62°F). September is autumn (fall) in United States. The month is moderately rainy, with about 103 mm (4.1 in) of rain spread over 10 days. You get roughly 12.2 hours of daylight and a mix of sun and cloud.
Is September a good time to visit Washington, D.C.?
Yes — September is one of the best months to visit Washington, D.C.. The weather rates excellent (8.4/10) on our comfort score.
September weather at a glance
| Average high | 27°C (80°F) |
|---|---|
| Average low | 17°C (62°F) |
| Daily mean | 22°C (71°F) |
| Rainfall | 103 mm (4.1 in) |
| Rainy days (1 mm+) | 10 |
| Humidity | 71% |
| Cloud cover | 51% |
| Daylight | 12.2 hours |
| Est. sunshine | 6.6 hours/day |
| Wind | 8.3 km/h |
| vs August | 4°C cooler than August, with similar rainfall. |
What to pack for Washington, D.C. in September
- light, breathable clothing
- sunscreen and a hat
- an umbrella or rain jacket
Washington, D.C. weather in other months
Jan5°C / -3°C71 mmPoorFeb7°C / -3°C69 mmFairMar12°C / 1°C80 mmFairApr18°C / 7°C90 mmExcellentMay23°C / 12°C103 mmGoodJun28°C / 18°C107 mmGoodJul31°C / 21°C114 mmFairAug31°C / 20°C110 mmFairSep27°C / 17°C103 mmExcellentOct20°C / 10°C100 mmExcellentNov13°C / 3°C72 mmGoodDec8°C / -1°C96 mmFair
← AugustBest time to visit Washington, D.C.October →
Better weather in September nearby
- San Francisco, California24°C · 4 mm · Excellent
- Seattle, Washington21°C · 62 mm · Excellent
- Denver, Colorado29°C · 35 mm · Excellent
- Calgary20°C · 49 mm · Excellent
- Edmonton19°C · 41 mm · Excellent
Nearby in September
- Philadelphia, Pennsylvania26°C · 101 mm
- Brooklyn, New York23°C · 102 mm
- New York23°C · 102 mm
- Manhattan, New York25°C · 104 mm
- Queens, New York23°C · 102 mm
- The Bronx, New York25°C · 104 mm
Where else is good in September? See where to go in September.