Istanbul weather in December 2025

Expect 11°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Istanbul in December. Check more long-term weather averages for Istanbul in December before you book your next holiday to Turkey in 2025/2026.

  • 11°C maximum daytime temperature in December in Istanbul11
    11°C max day temperature
  • 4 hours of sunshine per day
  • 18 days with some rainfall in December in Istanbul18
    18 days with some rainfall
  • 5°C minimum night-time temperature in December in Istanbul5
    5°C min night temperature
  • 9 hours of daylight per day in December in Istanbul9
    9 hours of daylight per day
  • No heat & humidity in December in Istanbul0
    No heat & humidity
  • 126 mm monthly rainfall in December in Istanbul126
    126 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Istanbul1
    1 (Low) UV index
  • 10°C sea temperature in December in Istanbul10
    10°C sea temperature

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The December 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 warm is it in Istanbul in December?

Daytime temperatures usually reach 11°C in Istanbul in December, falling to 5°C at night.

How sunny is it in Istanbul in December?

There are normally 4 hours of bright sunshine each day in Istanbul in December - that's 46% of daylight hours.

Is the sea cold around Istanbul in December?

The average sea temperature around Istanbul in December is 10°C.

Does it rain in Istanbul in December?

There are usually 18 days with some rain in Istanbul in December and the average monthly rainfall is 126mm.

Istanbul December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 08:10 17:37
Tuesday, 16th December 2025 08:23 17:37
Wednesday, 31st December 2025 08:29 17:46

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