May 31 is generally a great time to visit Istanbul. While there is a slight chance of rain (16%), showers are usually brief. Expect comfortable 23°C weather. Istanbul is seeing high visitor numbers, so iconic spots may be busier than usual.
View the full calendar
Essential Travel Info for Istanbul
Currency
TRY
₺ Turkish lira
Language
Turkish
Driving
Right side
Connect
For general information on SIM cards, Wi...
Safety
Travel Precautions
GPI: 2.785
Istanbul Weather Forecast for May 31
"Mild & Comfortable. Expect average highs of 23.4°C. 16% chance of rain."
What to Wear in Istanbul in May
Based on historical data for May 31, Istanbul typically experiences temperatures between 15.9°C and 23.4°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (16% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Istanbul
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
23.4°C
Daytime Peak
Average Low
15.9°C
Nighttime Low
Feels Like
24°C
☀️ Feels accurate
Rain Chance
16%
Avg 0.8mm if it rains
Cloud Cover
42%
Overcast
Pressure
1013.5 hPa
Low volatility
Istanbul Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 97% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
05:00 - 10:00
16:00 - 20:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
18.7°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
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Turkey
Flight Traffic
Busy
60/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~761
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Istanbul
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:36
☀️ Noon
13:03
🌇 Sunset
20:30
⏱️ Daylight
14h 53m
Wind Speed
17.6 km/h
Gentle breeze
Sunshine
12.8 hrs
Direct Sun (Cloud-free)
Humidity
75%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Istanbul
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 Istanbul
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Istanbul on May 31 averages 23.4°C with a 16% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Istanbul 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
22.5°C • 15% rain
Score
100
June 4
24.6°C • 13% rain
Score
100
June 5
24.7°C • 12% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 31) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Istanbul Worth Visiting on May 31?
Planning a trip to Istanbul on May 31? 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 23.4°C with a 16% historical precipitation risk.
✈️ Travel Logistics: Approximately 761 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 7 vaccinations are recommended for Turkey, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 17.8°C (refreshing tonic). Wave conditions are generally lake-like with heights around 0.18m.
📊 Historical Extremes: The hottest May 31 recorded in the last 30 years saw temperatures hit 28°C in 2019, while the coldest dropped to 12.8°C in 2020.