Istanbul weather in December 2026

Q: How warm is it in Istanbul in December?

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

Q: 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.

Q: Is the sea cold around Istanbul in December?

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

Q: 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.

Expect daytime maximum temperatures of 52°F in Istanbul, Turkey in December based on long-term weather averages. There are 4 hours of sunshine per day on average with 18 days with some rainfall and typically 5.0 inches of rainfall in the month.

52
52°F max day temperature
4
4 hours of sunshine per day
18
18 days with some rainfall
41
41°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
5.0
5.0 inches of monthly rainfall
1
1 (Low) UV index
50
50°F 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) | Imperial (°F)