USA
Washington, D.C. in September: weather & travel advice
This month's data profile
Strong month under the current formula
Washington, D.C. in September is climatically well suited to family holidays and city breaks. The average daily high is around 26 °C. With about 11 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
77/100 · #2
Warmth
#4
Dryness
#8
Sun
#6
Published best categories: Overall, City break, Active, Family
Washington, D.C. · SeptemberPhoto: Pom' · CC BY-SA 2.0Climate facts
- Average high
- 26 °C
- Average low
- 16 °C
- Rainy days (est.)
- 11 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 71 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Score |
|---|---|---|---|---|---|---|---|---|
| August | 30 | 20 | 13 | 103 | 6.7 | 68 | 2.0 | 60 |
| September (selected) | 26 | 16 | 11 | 110 | 5.4 | 71 | 2.4 | 77 |
| October | 20 | 9 | 8 | 88 | 4.1 | 75 | 2.6 | 79 |
How do the previous and next months compare?
Baseline: September (77/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | |
|---|---|---|---|---|---|---|---|---|
| August | -17 | +3.7 °C | +3.8 °C | +2.1 | -7.5 mm | +1.3 h | -2.6 % | -0.4 m/s |
| October | +2 | -6.6 °C | -6.8 °C | -2.8 | -22.2 mm | -1.3 h | +3.9 % | +0.2 m/s |
All twelve months in context
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Where to stay in Washington, D.C.
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Useful next decisions
Frequently asked questions
How warm is Washington, D.C. in September?
The average daily high is around 26 °C, with an average daily low of about 16 °C.
Does it rain a lot in Washington, D.C. in September?
The curated estimate is about 11 rainy days per month, not a directly measured long-term average. Total precipitation averages around 110 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Washington, D.C.?
By the climate score, April, May, September and October are the strongest months for Washington, D.C.. September is one of them.