Washington D.C. September Weather

Averages and records for weather in Washington D.C. in the month of September.
Typical Washington D.C. September Weather
1991–2020
Average daily high 80.3 °F
Average daily low 63.7 °F
Average monthly precipitation 3.9 inches
Average monthly snow none
Daily chance of precipitation 29.1%
Daily chance of snow 0%
Washington D.C. September Weather Records
1851–2024
Highest temperature 104 °F September 7, 1881
Lowest temperature 36 °F September 23, 1904
Highest daily low 79 °F September 4, 2018
Lowest daily high 52 °F September 28, 1984
Hottest average high temperature 88.2 °F 1881
Coldest average high temperature 72.0 °F 1888
Most daily precipitation 5.2 inches September 1, 1922
Most monthly precipitation 17.5 inches 1934
Most daily snow none -
Most monthly snow none -
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
September 1 84.7 67.9 99 50
September 2 84.4 67.6 101 50
September 3 84.2 67.4 98 48
September 4 83.9 67.1 98 49
September 5 83.6 66.9 99 50
September 6 83.4 66.6 98 47
September 7 83.2 66.3 104 46
September 8 82.9 66.1 100 52
September 9 82.7 65.9 98 48
September 10 82.3 65.6 98 44
September 11 81.9 65.2 98 40
September 12 81.6 64.9 98 41
September 13 81.3 64.6 95 44
September 14 81.0 64.3 95 46
September 15 80.6 63.9 97 43
September 16 80.2 63.5 96 44
September 17 79.8 63.1 96 44
September 18 79.4 62.7 91 45
September 19 79.0 62.3 96 44
September 20 78.7 61.9 94 41
September 21 78.4 61.6 96 41
September 22 78.0 61.2 98 39
September 23 77.6 60.8 98 36
September 24 77.2 60.4 99 39
September 25 76.9 60.0 95 39
September 26 76.6 59.7 96 38
September 27 76.2 59.4 95 40
September 28 75.8 59.0 91 42
September 29 75.4 58.6 93 40
September 30 75.0 58.2 91 38
Weather Station Details
Years Station Coordinates
1945–2024 Washington Reagan Airport location
1851–1945 Washington D.C. location