September 12 is generally a great time to visit Rotterdam. While there is a slight chance of rain (26%), showers are usually brief. Expect comfortable 20°C weather. As it's peak season for Rotterdam, we recommend booking your stay well in advance to secure the best rates.
View the full calendar
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 September 12
"Mild & Comfortable. Expect average highs of 19.5°C. 26% chance of rain."
What to Wear in Rotterdam in September
Based on historical data for September 12, Rotterdam typically experiences temperatures between 12.9°C and 19.5°C. We recommend packing light jacket, long pants to stay comfortable. With a 26% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Rotterdam
Smart Suitcase
- Light Jacket
- Long Pants
Average High
19.5°C
Daytime Peak
Average Low
12.9°C
Nighttime Low
Feels Like
19.5°C
🌤️ Feels accurate
Rain Chance
26%
Avg 1.5mm if it rains
Cloud Cover
65%
Light drizzle
Pressure
1015.1 hPa
Medium volatility
Rotterdam 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 15 for extended outdoor time
Type I-II
🔴 40 min to burn
Type III-IV
🟡 60 min to burn
Type V-VI
🟢 100 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16°C
Noticeable
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
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Netherlands
Flight Traffic
High
95/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~35
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Rotterdam
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:12
☀️ Noon
12:39
🌇 Sunset
19:07
⏱️ Daylight
12h 54m
Wind Speed
19.6 km/h
Gentle breeze
Sunshine
8.8 hrs
Direct Sun (Cloud-free)
Humidity
80%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Rotterdam
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 Rotterdam
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
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Rotterdam on September 12 averages 19.5°C with a 26% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
September 6
21.1°C • 28% rain
Score
95
September 7
20.9°C • 28% rain
Score
95
September 5
21.2°C • 28% rain
Score
94
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 12) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Rotterdam Worth Visiting on September 12?
Planning a trip to Rotterdam on September 12? 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 19.5°C with a 26% historical precipitation risk.
✈️ Travel Logistics: Approximately 35 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 19.7°C (refreshing tonic). Wave conditions are generally lake-like with heights around 0m.
📊 Historical Extremes: The hottest September 12 recorded in the last 30 years saw temperatures hit 27.7°C in 2016, while the coldest dropped to 8.2°C in 2024.