May 21 sees frequent showers in Interlaken. Historical data shows a 42% chance of rain, so pack accordingly. Temperatures average 18°C. You'll enjoy Interlaken with reasonable crowd levels and competitive accommodation options.
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Essential Travel Info for Interlaken
Currency
CHF
Fr. Swiss franc
Language
French
+3 more
Driving
Right side
Connect
As of March 2022 formobile devices, Inte...
Safety
Very High Safety
GPI: 1.357
Interlaken Weather Forecast for May 21
"Mild & Comfortable. Expect average highs of 17.9°C. 42% chance of rain."
What to Wear in Interlaken in May
Based on historical data for May 21, Interlaken typically experiences temperatures between 8.1°C and 17.9°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 42% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Interlaken
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
17.9°C
Daytime Peak
Average Low
8.1°C
Nighttime Low
Feels Like
17.9°C
🌤️ Feels accurate
Rain Chance
42%
Avg 3mm if it rains
Cloud Cover
66%
Moderate drizzle
Pressure
1016.2 hPa
Medium volatility
Interlaken Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 87% 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 - 20:00
Type I-II
🔴 18 min to burn
Type III-IV
🟡 27 min to burn
Type V-VI
🟢 45 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
14°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 Switzerland
Flight Traffic
Moderate
40/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~216
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Interlaken
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:49
☀️ Noon
12:26
🌇 Sunset
20:03
⏱️ Daylight
15h 14m
Wind Speed
9.4 km/h
Light breeze
Sunshine
10.6 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Interlaken
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 Interlaken
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, Interlaken on May 21 averages 17.9°C with a 42% precipitation probability. Wedding/Outdoor Event Score: 81/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Interlaken 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
19.2°C • 34% rain
Score
90
May 27
19.1°C • 36% rain
Score
89
May 26
18.9°C • 35% rain
Score
88
💡 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 Interlaken Worth Visiting on May 21?
Planning a trip to Interlaken 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 17.9°C with a 42% historical precipitation risk.
✈️ Travel Logistics: Approximately 216 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 7 vaccinations are recommended for Switzerland, including COVID-19.
📊 Historical Extremes: The hottest May 21 recorded in the last 30 years saw temperatures hit 23.9°C in 2022, while the coldest dropped to 6°C in 2016.