Weather in Washington DC in September
As an Amazon Associate we earn from qualifying purchases. We also earn commission from other retail partners. Links below are affiliate links.
Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Washington DC.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youSeptember in Washington DC is warm, with average highs of 25.8°C and lows of 16.3°C. It is fairly wet (10 rainy days on average), with roughly 9.1 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit Washington DC — every month compared. Once you know when to go, find your Washington DC packing list at 247PackingList.
Get ready for Washington DC in September
Search flights to Washington DC
Compare 100+ airlines for September — one search, best price.
Search Flights →Thermal travel layers
Pack proper layers — winters are genuinely cold and evenings drop fast year-round.
Check Price →Secure WiFi abroad
Protect your devices on hotel and airport WiFi in Washington DC.
Get NordVPN →What to pack for Washington DC in September
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Washington DC
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 7.4°C | 78.2mm | 10/10 |
| February | 9.5°C | 97.1mm | 10/10 |
| March | 14.4°C | 80.8mm | 10/10 |
| April | 18.7°C | 108.8mm | 9/10 |
| May | 22.9°C | 98.4mm | 10/10 |
| June | 28.7°C | 137.4mm | 9/10 |
| July | 31.7°C | 169.2mm | 9/10 |
| August | 29.8°C | 223.4mm | 8/10 |
| September | 25.8°C | 137.7mm | 9/10 |
| October | 20.4°C | 113.1mm | 9/10 |
| November | 14.1°C | 95.5mm | 10/10 |
| December | 9.5°C | 124.5mm | 9/10 |
Full month-by-month guide: best time to visit Washington DC →
For facts about United States — currency, language and dialling code — see our United States country guide at 247CountryInfo. Travellers also find it useful to keep a Washington DC travel guide to hand. Check clothing sizes in United States before you shop.
Frequently Asked Questions
Is September a good time to visit Washington DC?
September rates 9/10 for visiting Washington DC — excellent time to visit. Expect average highs of 25.8°C, 137.7mm of rain across the month and about 9.1 hours of daily sunshine.
What is the temperature in Washington DC in September?
In September, Washington DC has average highs of 25.8°C (78.4°F) and average lows of 16.3°C (61.3°F).
Does it rain in Washington DC in September?
Some rain is likely. Washington DC averages 137.7mm across about 10 rainy days in September, so a light waterproof layer is worth packing.
What should I wear in Washington DC in September?
For Washington DC in September (25.8°C highs / 16.3°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts, compact travel umbrella.
More essentials for Washington DC in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
Check Price →Last updated:
Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.