May 21 is generally a great time to visit Oslo. While there is a slight chance of rain (31%), showers are usually brief. Expect comfortable 17°C weather. Oslo is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Oslo
Currency
NOK
kr Norwegian krone
Language
Norwegian Nynorsk
+2 more
Driving
Right side
Connect
Most of Oslo is covered by 5G. Most of t...
Safety
Very High Safety
GPI: 1.465
Oslo Weather Forecast for May 21
"Mild & Comfortable. Expect average highs of 16.8°C. 31% chance of rain."
What to Wear in Oslo in May
Based on historical data for May 21, Oslo typically experiences temperatures between 8.1°C and 16.8°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 31% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Oslo
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
16.8°C
Daytime Peak
Average Low
8.1°C
Nighttime Low
Feels Like
16.8°C
🌤️ Feels accurate
Rain Chance
31%
Avg 2.2mm if it rains
Cloud Cover
63%
Overcast
Pressure
1012.6 hPa
Medium volatility
Oslo Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 84% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
03:00 - 10:00
16:00 - 21:00
Type I-II
🔴 26 min to burn
Type III-IV
🟡 39 min to burn
Type V-VI
🟢 65 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
11.1°C
Pleasant
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
Business Day
Standard hours in Norway
Flight Traffic
High
95/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~348
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Oslo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
03:28
☀️ Noon
12:15
🌇 Sunset
21:01
⏱️ Daylight
17h 32m
Wind Speed
14.8 km/h
Gentle breeze
Sunshine
11.4 hrs
Direct Sun (Cloud-free)
Humidity
69%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Oslo
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 Oslo
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, Oslo on May 21 averages 16.8°C with a 31% precipitation probability. Wedding/Outdoor Event Score: 85/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Oslo Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
May 28
17.8°C • 29% rain
Score
90
May 18
16.5°C • 23% rain
Score
87
May 19
16.8°C • 24% rain
Score
87
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 21) in other destinations
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📍 Is Oslo Worth Visiting on May 21?
Planning a trip to Oslo 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 16.8°C with a 31% historical precipitation risk.
✈️ Travel Logistics: Approximately 348 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Norway, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 13.9°C (polar plunge). Wave conditions are generally lake-like with heights around 0.22m.
📊 Historical Extremes: The hottest May 21 recorded in the last 30 years saw temperatures hit 23.5°C in 2019, while the coldest dropped to 5.2°C in 2020.