Istanbul weather in May
May in Istanbul: nice, a little rain, with very humid — one of the best months to visit.
#1 of 12 months in Istanbul · #39 of 604 destinations to visit in May · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Istanbul climate normals — May
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Feels like (high) | 20°C / 68°F | |
| Rainfall | 36 mm / 1.4 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 75% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 11.8 h/day | |
| Daylight | 14.5 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 53 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Istanbul in May — FAQ
- Is May a good time to visit Istanbul?
- May in Istanbul: nice, a little rain, with very humid — one of the best months to visit. It ranks #1 of 12 months for Istanbul on SeasonMap's comfort score (92/100).
- What is the weather like in Istanbul in May?
- In May, Istanbul averages a daily high of 20.1°C and a low of 13.4°C, with about 36 mm of rain over roughly 8 rainy days.
- What is the air quality in Istanbul in May?
- Istanbul has a mean US Air Quality Index of about 53 in May.