Washington DC weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Washington DC September weather at a glance
In September, Washington DC averages 20.8°C, with typical highs of 25.6°C and lows of 16.8°C. The historical average is 14 wet days and 75% humidity.
Washington DC September temperature & humidity
Washington DC September rain & wet days
Pack a light rain jacket, waterproof pouch and quick-dry shoes. Keep an indoor stop available between outdoor activities.
What to wear in Washington DC in September
Choose breathable summer clothes and pack sun protection. Rain is frequent at roughly 14 days in the month; pack a rain jacket and water-resistant shoes.
- DaytimeBreathable short sleeves, hat and sunscreen · average high 25.6°C
- Morning & eveningLong sleeves with a jacket or cardigan · average low 16.8°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Washington DC September sunrise & sunset times
2026 September · Local time (America/New_York)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 06:37 | 19:38 | 13h 1m |
| 2026-09-15 | 06:50 | 19:16 | 12h 27m |
| 2026-09-30 | 07:03 | 18:52 | 11h 49m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Best months to visit Washington DC
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Washington DC weather like in September?
In September, Washington DC averages 20.8°C, with typical highs of 25.6°C and lows of 16.8°C. The historical average is 14 wet days and 75% humidity. Our weather-comfort rating for this month is fair.
Does it rain a lot in Washington DC in September?
There are about 14 wet days in September. Pack a rain jacket and water-resistant shoes.
What should I wear in Washington DC in September?
Choose breathable summer clothes and pack sun protection. Rain is frequent at roughly 14 days in the month; pack a rain jacket and water-resistant shoes.
What are the best months to visit Washington DC?
Recent weather data rates April, August, October among the more comfortable months.
Where can I check Washington DC weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in Washington DC in September?
On 2026-09-15, calculated sunrise is 06:50 and sunset is 19:16 in local time (America/New_York). Times vary by date and terrain.
Washington DC weather by month
More Americas destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations