April 21 is generally a great time to visit Rotterdam. While there is a slight chance of rain (18%), showers are usually brief. Expect comfortable 15°C weather. You'll enjoy Rotterdam with reasonable crowd levels and competitive accommodation options. Note: April 21 is Easter Monday in Rotterdam, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Rotterdam
Currency
EUR
€ Euro
Language
Dutch
Driving
Right side
Connect
The telephone country code for the Nethe...
Safety
High Safety
GPI: 1.522
Rotterdam Weather Forecast for April 21
"Mild & Comfortable. Expect average highs of 14.9°C. 18% chance of rain."
What to Wear in Rotterdam in April
Based on historical data for April 21, Rotterdam typically experiences temperatures between 5.9°C and 14.9°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (18% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Rotterdam
Smart Suitcase
- Light Jacket
- Long Pants
Average High
14.9°C
Daytime Peak
Average Low
5.9°C
Nighttime Low
Feels Like
14.9°C
🌤️ Feels accurate
Rain Chance
18%
Avg 0.7mm if it rains
Cloud Cover
55%
Overcast
Pressure
1016.1 hPa
High volatility
Rotterdam Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 88% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 24 min to burn
Type III-IV
🟡 36 min to burn
Type V-VI
🟢 60 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
9.9°C
Dry air
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Holiday
Easter Monday
Flight Traffic
Moderate
46/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~17
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Rotterdam
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:34
☀️ Noon
12:41
🌇 Sunset
19:49
⏱️ Daylight
14h 15m
Wind Speed
18.1 km/h
Gentle breeze
Sunshine
11.2 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Rotterdam
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Rotterdam
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Rotterdam on April 21 averages 14.9°C with a 18% precipitation probability. Wedding/Outdoor Event Score: 91/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Rotterdam Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (April 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Rotterdam Worth Visiting on April 21?
Planning a trip to Rotterdam on April 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 14.9°C with a 18% historical precipitation risk.
🎉 Local Event: The date coincides with Easter Monday, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 17 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Netherlands, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 10.6°C (polar plunge). Wave conditions are generally lake-like with heights around 0m.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 21.8°C in 2019, while the coldest dropped to 3.3°C in 2016.