Istanbul Weather in May
Turkey · Mediterranean climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Istanbul sees average temperatures ranging from a low of 12.4°C (54.3°F) to a high of 21.0°C (69.8°F), with a mean of 16.5°C (61.7°F). Compared to the annual average of 15.3°C (59.5°F), this month is 1.2°C warmer than the yearly norm. Precipitation averages 58.8mm, making it approximately 5.0mm drier than the monthly average of 64.0mm. The city receives an average of 11.5 hours of sunshine per day during May, with relative humidity averaging 75.5%. Wind speeds reach an average maximum of 20.8 km/h. For travelers, this month offers a temperature experience in Istanbul, with drier-than-average conditions compared to the rest of the year.
Istanbul is a city where you can wake up sweating and need a jacket by sunset. I packed for August heat once and froze on a Bosphorus ferry at 9pm. Layers are essential — even summer evenings dip to 19°C with wind off the water. Pack a scarf (useful for mosques anyway). My favorite window is late September to October: 22°C, low humidity, fewer tourists at the Hagia Sophia. Skip February — cold rain, grey skies, many outdoor cafés shuttered. April brings tulip season and the city reawakens.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 12.3°C (54.1°F) | 16.5°C (61.7°F) | 21.7°C (71.1°F) |
| Rainfall | 72.1mm | 58.8mm | 61.0mm |
| Sunshine | 9.4 hrs | 11.5 hrs | 12.9 hrs |
| Humidity | 76.2% | 75.5% | 75.8% |
| Wind | 21.8 km/h | 20.8 km/h | 20.5 km/h |
| Rainy Days | 14.6 | 12.8 | 11.4 |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Istanbul in May, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Istanbul in May?
The average temperature in Istanbul during May ranges from 12.4°C (54.3°F) to 21.0°C (69.8°F), with a mean of 16.5°C (61.7°F).
How much does it rain in Istanbul in May?
Istanbul receives an average of 58.8mm of precipitation in May, spread across approximately 12.8 rainy days.
What should I pack for Istanbul in May?
Based on May weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is May a good time to visit Istanbul?
May is a good time to visit Istanbul, with comfortable temperatures and manageable rainfall.
Other Months for Istanbul
Cities with Similar May Climate (Mediterranean)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 41.01°, 28.98°. Timezone: Europe/Istanbul. Last updated: 2026-07-30.