April 21 is generally a great time to visit Washington DC. While there is a slight chance of rain (20%), showers are usually brief. Expect comfortable 20°C weather. Expect a bustling atmosphere in Washington DC right now—this is when the city truly comes alive with visitors.
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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 April 21
"Mild & Comfortable. Expect average highs of 20.3°C. 20% chance of rain."
What to Wear in Washington DC in April
Based on historical data for April 21, Washington DC typically experiences temperatures between 8.8°C and 20.3°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (20% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Washington DC
Smart Suitcase
- Light Jacket
- Long Pants
Average High
20.3°C
Daytime Peak
Average Low
8.8°C
Nighttime Low
Feels Like
20.3°C
☀️ Feels accurate
Rain Chance
20%
Avg 1.7mm if it rains
Cloud Cover
62%
Overcast
Pressure
1016.4 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
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 20 min to burn
Type III-IV
🟡 30 min to burn
Type V-VI
🟢 50 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
13.3°C
Pleasant
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
81/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~383
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Washington DC
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:24
☀️ Noon
12:07
🌇 Sunset
18:51
⏱️ Daylight
13h 27m
Wind Speed
16.6 km/h
Gentle breeze
Sunshine
9.2 hrs
Direct Sun (Cloud-free)
Humidity
64%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Washington DC
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
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
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
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 April 21 averages 20.3°C with a 20% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— 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
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📍 Is Washington DC Worth Visiting on April 21?
Planning a trip to Washington DC on April 21? 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 20.3°C with a 20% historical precipitation risk.
✈️ Travel Logistics: Approximately 383 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 30.9°C in 2023, while the coldest dropped to 1.1°C in 2018.