Istanbul Weather in May
Istanbul in May sees pleasant daytime temperatures of 21°C (70°F) and nighttime lows of 14°C (57°F). Moderate rainfall is typical, with around 37 mm (1.5 in) for the month.
Rainfall in Istanbul in May
Past climate data indicates that roughly 8 days will see rain, totalling around 37 mm (1.5 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Istanbul in May
May is a excellent month in Istanbul, with 21°C (70°F) during the day and 14°C (57°F) at night. Conditions are often most pleasant around the middle of the day. At 14°C (57°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Istanbul in May
There are approximately 247 hours of sunshine this month, resulting in mostly clear days.
Average water temperature in May
At 16°C (61°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August, September and October typically offer the best weather for Istanbul.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Turkey, check out our Istanbul's climate page.
Istanbul Temperature in May
Min Temperature
14°C (57°F)
Max Temperature
21°C (70°F)
Water Temperature
16°C (61°F)
Chance of Rain
28%
Precipitation
37 mm (1.5 in)
Rainy days
8 days
Sunshine
247 hours
Percentage Sunshine
57%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Istanbul typically rise from around 19°C (66°F) at the start of May to approximately 23°C (73°F) by the end. Nights are cool, with lows typically ranging from 11°C (52°F) to 17°C (63°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Istanbul in May
Browse day-by-day weather records for Istanbul spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Istanbul historical weather extremes in May
The extremes listed below come from historical weather data collected in Istanbul from 1976 through 2026.
- The warmest day in May was on May 6, 2007, with a maximum of 32°C (90°F).
- On May 1, 1987, Istanbul saw its coldest May day with temperatures maxing out at 9°C (48°F).
- Istanbul registered its coldest May night on May 4, 1990, with temperatures dropping to 4°C (39°F).
Best Places in Turkey in May
Find out more about the weather in Turkey and which places have the best travel conditions in this month. See all of Turkey in May →
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What to Wear in Istanbul in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Pack a light rain jacket or compact umbrella for occasional showers. With water temperatures around 16°C (61°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Istanbul in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Turkey, check out our Istanbul's climate page.
Temperature Rainfall Sunshine Water Temp
See the full Istanbul climate overview or explore weather in Turkey.
