Washington DC · AutumnMonth summary
Washington DC weather in September
✅ Good
🌡️ Temperature min / max
17°C – 26°C
🌧 Rainy days
37% of days
☀️ Sunshine
11.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.9/10
📅 📅 Best month
June (8.1/10)
Quick decision
Should you visit Washington DC in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 26°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Washington DC in September: 26°C and 11.0h of sunshine. Decent, but not the peak.
By trip type
Washington DC in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : — No sea access
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 One of the best months — 26°C, maximum sunshine and ideal conditions Autumn in Washington DC is often underrated: 26°C, golden light and declining crowds. An interesting window. Expect rain on 37% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if June (8.1/10) remains theoretically better.
Browse by month
All months for Washington DC
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌫️ January | -2°C | 6°C | 29% | 2.6 | 7.8h | 4.2/10 |
| 🌦️ February | -1°C | 10°C | 36% | 3.1 | 8.4h | 4.6/10 |
| ⛅ March | 3°C | 13°C | 33% | 2.9 | 10.0h | 6.1/10 |
| 🌤️ April | 8°C | 19°C | 37% | 3.2 | 10.7h | 7.2/10 |
| 🌤️ May | 13°C | 23°C | 45% | 4.8 | 11.1h | 7.4/10 |
| 🌤️ June | 18°C | 29°C | 41% | 4.3 | 13.2h | 8.1/10 |
| 🌤️ July | 22°C | 31°C | 47% | 6.1 | 13.3h | 7.5/10 |
| 🌤️ August | 21°C | 30°C | 44% | 5.1 | 12.1h | 7.6/10 |
| 🌤️ September | 17°C | 26°C | 37% | 4.4 | 11.0h | 7.9/10 |
| 🌤️ October | 10°C | 20°C | 28% | 3.0 | 9.9h | 7.4/10 |
| ⛅ November | 4°C | 14°C | 26% | 2.7 | 9.2h | 6.7/10 |
| 🌫️ December | 0°C | 8°C | 28% | 3.2 | 7.5h | 4.4/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Washington DC averages 26°C, 37% rainy days and 11.0h of sunshine per day. Overall weather score: 7.9/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 8.1/10). Difference:
- 🌡️ Max temperature : +3°C
- 🌧 Rainy days : +4%
- ☀️ Sunshine : +2.2h/day
FAQ
FAQ — Washington DC in September
Is September a good time to visit Washington DC?
September is an excellent time to visit Washington DC (score 7.9/10). With 26°C, 11.0h of sunshine and 37% rain, conditions are very favourable.
What to do in Washington DC in September?
With 26°C max and 11.0h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
Find a place to stay in Washington DC
Find places to stay in Washington DC in September
Search on Hotels.com
Activities & tours
Activities and tours in Washington DC
Guided tours, skip-the-line tickets and local experiences.
Browse activities on GetYourGuide
Flights
Find a flight to Washington DC
Compare flights from all airlines.
Search flights
←
Explore also
Similar destinations in September
🌍 Top destinations
Other top destinations in September
Cabo San Lucas
Lima
Saint Thomas
Cape Verde
HurghadaWeather rankings
Compare destinations by weather
Best in EuropeGuides & comparisons