Istanbul weather in May 2025

Expect 21°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Istanbul in May. Check more long-term weather averages for Istanbul in May before you book your next holiday to Turkey in 2025/2026.

  • 21°C maximum daytime temperature in May in Istanbul21
    21°C max day temperature
  • 10 hours of sunshine per day
  • 9 days with some rainfall in May in Istanbul9
    9 days with some rainfall
  • 12°C minimum night-time temperature in May in Istanbul12
    12°C min night temperature
  • 14 hours of daylight per day in May in Istanbul14
    14 hours of daylight per day
  • No heat & humidity in May in Istanbul0
    No heat & humidity
  • 35 mm monthly rainfall in May in Istanbul35
    35 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Istanbul7
    7 (High) UV index
  • 15°C sea temperature in May in Istanbul15
    15°C sea temperature

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The May weather guide for Turkey (Istanbul) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Turkey

How hot is it in Istanbul in May?

Daytime temperatures usually reach 21°C in Istanbul in May, falling to 12°C at night.

How sunny is it in Istanbul in May?

There are normally 10 hours of bright sunshine each day in Istanbul in May - that's 67% of daylight hours.

How warm is the sea around Istanbul in May?

The average sea temperature around Istanbul in May is 15°C.

Does it rain in Istanbul in May?

There are usually 9 days with some rain in Istanbul in May and the average monthly rainfall is 35mm.

Istanbul May sunrise & sunset times

Browse the sunrise and sunset times for Istanbul in May 2025. Select a month to view Istanbul sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 06:02 20:01
Friday, 16th May 2025 05:45 20:16
Saturday, 31st May 2025 05:35 20:29

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