May 15 is generally a great time to visit Washington DC. While there is a slight chance of rain (32%), showers are usually brief. Expect comfortable 23°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 May 15
"Mild & Comfortable. Expect average highs of 22.8°C. 32% chance of rain."
What to Wear in Washington DC in May
Based on historical data for May 15, Washington DC typically experiences temperatures between 12.5°C and 22.8°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 32% 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
- Light Jacket
- Long Pants
- Umbrella
Average High
22.8°C
Daytime Peak
Average Low
12.5°C
Nighttime Low
Feels Like
23.2°C
☀️ Feels accurate
Rain Chance
32%
Avg 2.5mm if it rains
Cloud Cover
62%
Overcast
Pressure
1015.7 hPa
Medium volatility
Washington DC Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
04:00 - 10:00
16:00 - 19:00
Type I-II
🔴 16 min to burn
Type III-IV
🟡 24 min to burn
Type V-VI
🟢 40 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
17°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
89/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~417
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Washington DC
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:57
☀️ Noon
12:05
🌇 Sunset
19:14
⏱️ Daylight
14h 17m
Wind Speed
15.6 km/h
Gentle breeze
Sunshine
9.4 hrs
Direct Sun (Cloud-free)
Humidity
70%
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 May 15 averages 22.8°C with a 32% 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
May 21
24.2°C • 26% rain
Score
97
May 16
23.3°C • 28% rain
Score
96
May 19
23.6°C • 26% rain
Score
96
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 15) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Washington DC Worth Visiting on May 15?
Planning a trip to Washington DC on May 15? 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 22.8°C with a 32% historical precipitation risk.
✈️ Travel Logistics: Approximately 417 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest May 15 recorded in the last 30 years saw temperatures hit 32.7°C in 2018, while the coldest dropped to 7.2°C in 2019.