May 21 is generally a great time to visit Prague. While there is a slight chance of rain (24%), showers are usually brief. Expect comfortable 20°C weather. Moderate travel demand makes this an excellent time for a balanced Prague experience.
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Essential Travel Info for Prague
Currency
CZK
Kč Czech koruna
Language
Czech
+1 more
Driving
Right side
Connect
Prague has 5G from all Czech carriers (O...
Safety
Very High Safety
GPI: 1.318
Prague Weather Forecast for May 21
"Mild & Comfortable. Expect average highs of 20°C. 24% chance of rain."
What to Wear in Prague in May
Based on historical data for May 21, Prague typically experiences temperatures between 10.1°C and 20°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (24% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Prague
Smart Suitcase
- Light Jacket
- Long Pants
Average High
20°C
Daytime Peak
Average Low
10.1°C
Nighttime Low
Feels Like
20°C
☀️ Feels accurate
Rain Chance
24%
Avg 1.5mm if it rains
Cloud Cover
63%
Light drizzle
Pressure
1015.2 hPa
Medium volatility
Prague Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
04:00 - 10:00
16:00 - 19:00
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
13.7°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 Czech Republic
Flight Traffic
Moderate
56/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~188
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Prague
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:10
☀️ Noon
12:00
🌇 Sunset
19:50
⏱️ Daylight
15h 40m
Wind Speed
15.6 km/h
Gentle breeze
Sunshine
10.5 hrs
Direct Sun (Cloud-free)
Humidity
67%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Prague
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Prague
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
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 acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Prague on May 21 averages 20°C with a 24% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Prague Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Prague Worth Visiting on May 21?
Planning a trip to Prague on May 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°C with a 24% historical precipitation risk.
✈️ Travel Logistics: Approximately 188 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest May 21 recorded in the last 30 years saw temperatures hit 25.4°C in 2023, while the coldest dropped to 7.4°C in 2021.