Historical Weather in Istanbul, Turkey
See 55+ years of weather history for any date in Istanbul going back to 1970.
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Monthly Climate Averages
Historical temperature and precipitation averages for Istanbul, Turkey, based on 55+ years of weather data.
Temperatures shown in Celsius with Fahrenheit in parentheses. Rainfall in millimetres, snowfall in centimetres.
Istanbul Weather by Month
January in Istanbul has become 1.9°C (3.4°F) warmer on average: the 2011–2025 average against 1970–1989.
February in Istanbul has become 2.4°C (4.3°F) warmer on average: the 2011–2025 average against 1970–1989.
Istanbul's hottest March day on record is a recent one: 27°C (81°F) on March 15, 2025.
April in Istanbul has become 2.0°C (3.6°F) warmer on average: the 2011–2025 average against 1970–1989.
May in Istanbul has become 1.8°C (3.1°F) warmer on average: the 2011–2025 average against 1970–1989.
June 2025 was the 2nd warmest June in 41 years of records, 2.3°C (4.1°F) above the long-run average.
July in Istanbul has become 3.4°C (6.1°F) warmer on average: the 2011–2025 average against 1970–1989.
Istanbul's hottest August day on record is a recent one: 39°C (102°F) on August 4, 2023.
6 of the 10 warmest Septembers on record in Istanbul have come since 2010.
The October heat record, 34°C (94°F) on October 7, 1984, has stood for 41 years.
Istanbul's hottest November day on record is a recent one: 30°C (85°F) on November 4, 2023.
December in Istanbul has become 2.3°C (4.1°F) warmer on average: the 2010–2024 average against 1970–1989.
Source: NOAA GHCN-Daily, Istanbul (1971–2007); Istanbul Bolge (Kartal) (2014–2025). Records through 2025.