September 27 is generally a great time to visit Washington DC. While there is a slight chance of rain (31%), showers are usually brief. Expect comfortable 24°C weather. Washington DC is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Washington DC
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
The D.C. government operates a network o...
Safety
Moderate Safety
GPI: 2.44
Washington DC Weather Forecast for September 27
"Mild & Comfortable. Expect average highs of 23.9°C. 31% chance of rain."
What to Wear in Washington DC in September
Based on historical data for September 27, Washington DC typically experiences temperatures between 15.6°C and 23.9°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 31% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Washington DC
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
23.9°C
Daytime Peak
Average Low
15.6°C
Nighttime Low
Feels Like
24.6°C
☀️ Feels accurate
Rain Chance
31%
Avg 2.6mm if it rains
Cloud Cover
60%
Overcast
Pressure
1016.7 hPa
Medium volatility
Washington DC Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 91% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 30 min to burn
Type III-IV
🟡 45 min to burn
Type V-VI
🟢 75 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.4°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
95/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~447
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Washington DC
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:01
☀️ Noon
12:00
🌇 Sunset
17:59
⏱️ Daylight
11h 57m
Wind Speed
14.1 km/h
Gentle breeze
Sunshine
7.1 hrs
Direct Sun (Cloud-free)
Humidity
76%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Washington DC
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Washington DC
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Washington DC on September 27 averages 23.9°C with a 31% precipitation probability. Wedding/Outdoor Event Score: 94/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Washington DC Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
October 4
22.9°C • 20% rain
Score
99
September 20
25.4°C • 22% rain
Score
98
September 21
25.2°C • 23% rain
Score
98
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 27) in other destinations
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📍 Is Washington DC Worth Visiting on September 27?
Planning a trip to Washington DC on September 27? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 23.9°C with a 31% historical precipitation risk.
✈️ Travel Logistics: Approximately 447 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest September 27 recorded in the last 30 years saw temperatures hit 31.1°C in 2017, while the coldest dropped to 12.2°C in 2021.