June 21 is generally a great time to visit Helsinki. While there is a slight chance of rain (26%), showers are usually brief. Expect comfortable 17°C weather. Helsinki is currently in its most popular travel window, meaning vibrant crowds and premium pricing. Note: June 21 is Midsummer Day in Helsinki, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Helsinki
Currency
EUR
€ Euro
Language
Finnish
+1 more
Driving
Right side
Connect
Much of Helsinki is blanketed withWi-Fi ...
Safety
Very High Safety
GPI: 1.439
Helsinki Weather Forecast for June 21
"Mild & Comfortable. Expect average highs of 17.4°C. 26% chance of rain."
What to Wear in Helsinki in June
Based on historical data for June 21, Helsinki typically experiences temperatures between 12.6°C and 17.4°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 Helsinki
Smart Suitcase
- Light Jacket
- Long Pants
Average High
17.4°C
Daytime Peak
Average Low
12.6°C
Nighttime Low
Feels Like
17.4°C
🌤️ Feels accurate
Rain Chance
26%
Avg 1.7mm if it rains
Cloud Cover
60%
Overcast
Pressure
1010.8 hPa
Medium volatility
Helsinki Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 95% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
02:00 - 10:00
16:00 - 21:00
Type I-II
🔴 23 min to burn
Type III-IV
🟡 35 min to burn
Type V-VI
🟢 58 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
13.5°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
Holiday
Midsummer Day
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~613
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Helsinki
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
02:55
☀️ Noon
12:23
🌇 Sunset
21:51
⏱️ Daylight
18h 55m
Wind Speed
19.6 km/h
Gentle breeze
Sunshine
13.3 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Helsinki
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 Helsinki
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Mild discomfort possible for arthritic conditions.
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, Helsinki on June 21 averages 17.4°C with a 26% precipitation probability. Wedding/Outdoor Event Score: 89/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Helsinki Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
June 27
18.7°C • 24% rain
Score
94
June 28
18.9°C • 26% rain
Score
94
June 26
18.5°C • 26% rain
Score
93
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (June 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Helsinki Worth Visiting on June 21?
Planning a trip to Helsinki on June 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 17.4°C with a 26% historical precipitation risk.
🎉 Local Event: The date coincides with Midsummer Day, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 613 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 8 vaccinations are recommended for Finland, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 16.7°C (polar plunge). Wave conditions are generally lake-like with heights around 0.37m.
📊 Historical Extremes: The hottest June 21 recorded in the last 30 years saw temperatures hit 21.9°C in 2021, while the coldest dropped to 10.2°C in 2017.