Istanbul Weather in May
In May, Istanbul averages a high of 22°C (71°F) and a low of 13°C (55°F), from 42 years of daily records (1971–2025).
22°C
Average high
71°F
13°C
Average low
55°F
33°C
Record high
91°F · May 19, 1994
4°C
Record low
38°F · May 1, 1985
What May Is Like in Istanbul
- May in Istanbul has become 1.8°C (3.1°F) warmer on average: the 2011–2025 average against 1970–1989.
- 6 of the 10 warmest Mays on record in Istanbul have come since 2011.
- The May heat record, 33°C (91°F) on May 19, 1994, has stood for 31 years.
- The coldest May reading, 4°C (38°F) on May 1, 1985, has not been matched in 40 years.
At least 1 mm of rain falls on 51% of May days.
Warmest: 2015 (24.6°C)Latest: 2025 (23.9°C)10-year averageLong-run average (21.8°C)
Look Up a Day in May
See the weather in Istanbul on any May date, year by year.
Source: NOAA GHCN-Daily, Istanbul (1971–2007); Istanbul Bolge (Kartal) (2014–2025). Averages cover 1971–2025. How we compute this