Washington D. C. in september: average Weather, Temperature and Climate
Weather in Washington D. C. in september 2025
The weather in Washington D. C. in september comes from statistical datas on the past years. You can view the weather statistics for all the month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather UV index: 6
Weather at 6am
67°F
Clear/Sunny
45% of time
24%
12%
9%
Weather at 12pm
81°F
Clear/Sunny
43% of time
25%
13%
13%
Weather at 6pm
72°F
Clear/Sunny
47% of time
24%
16%
6%
Weather at 3am
67°F
42%
19%
16%
14%
Evolution of daily average temperature and precipitation in Washington D. C. in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Washington D. C. in september.
The climate of Washington D. C. in september is good
The climate in september in Washington D. C. is relatively dry (with 4.7in of rainfall over 6 days). The weather is better from the previous month since in august it receives an average of 5.7in of rainfall over 9 days.
The climate comfortable here the month of september. Temperatures are up to 83°F. On average, the recorded minimum temperature is 67°F. Thus, the mean temperature average in september in Washington D. C. is 74°F. Note that these seasonal averages are in contrast with those observed in Washington D. C. in the month of september with a maximum record of 101°F in 2018 and a minimum record of 50°F in 2011. You can expect to have about 9 days with temperatures up to 86°F, or 30 of time.
Day length in Washington D. C. in september is 12:26. Sunrise is at 05:50 and sunset is at 18:16.
With good weather conditions, september is a good time to go in Washington D. C..
Seasonal average climate and temperature of Washington D. C. in september
Check below seasonal norms These datas are generated from the weather statements of the last years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 74°F | ||||
| Highest temperature | 83°F | ||||
| Lowest temperature | 67°F | ||||
| Highest record temperature | 101°F (2018) | ||||
| Lowest record temperature | 50°F (2011) | ||||
| Number of days at +86°F | 9 day(s) (30%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 75°F | ||||
| Lowest sea temperature | 72°F | ||||
| Highest sea temperature | 77°F | ||||
| Wind | |||||
| Wind speed | 13km/h | ||||
| Wind temperature | 67°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 4.7in | ||||
| Number of days with rainfall | 6 day(s) (19%) | ||||
| Record daily rainfall | 4.1in (2010) | ||||
| Other climate data | |||||
| Humidity | 83% | ||||
| Visibility | 8.95km | ||||
| Cloud cover | 35% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:50 | ||||
| Time of sunset | 18:16 | ||||
| Length of day | 12:26 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Washington D. C. in september 2024:
72°F to 85°F
67°F to 79°F
58°F to 76°F
58°F to 77°F
59°F to 79°F
63°F to 79°F
65°F to 72°F
52°F to 72°F
54°F to 79°F
58°F to 86°F
61°F to 86°F
61°F to 83°F
63°F to 83°F
65°F to 85°F
63°F to 85°F
63°F to 74°F
68°F to 70°F
67°F to 70°F
65°F to 72°F
68°F to 79°F
68°F to 76°F
67°F to 70°F
65°F to 76°F
65°F to 67°F
68°F to 76°F
74°F to 83°F
70°F to 76°F
72°F to 86°F
70°F to 76°F
65°F to 70°F
Map: other cities in the United States (USA) in september
Cities near Washington D. C.:
| Maryland in september | good weather |
| Baltimore in september | good weather |
| Ocean City (Maryland) in september | good weather |
| Wildwood in september | good weather |
| Philadelphia in september | good weather |
| Virginia in september | good weather |
| Atlantic City in september | perfect weather |
| Virginia Beach in september | good weather |
| New Jersey in september | perfect weather |
| Pittsburgh in september | good weather |
| New York City in september | good weather |
| Brooklyn in september | good weather |
Click over cities on the map for information about the weather in september.
Washington D. C.
perfect weather
good
tolerable
bad
very bad
Weather data for Washington D. C. in september:
Weather data for Washington D. C. for september are derived from an average of the weather forecast since 2009 in Washington D. C.. There is a margin of error and these forecasts are to be considered as general information only. The weather in Washington D. C. can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Washington D. C..