December weather forecast and climate
Istanbul, Turkey

Ships along the coast of the port city of Istanbul, Turkey, with a background view of the cityscape
Ships along the coast of the port city of Istanbul, Turkey, with a background view of the cityscape
December is the wettest month of the year, with 121.9mm (4.8") of rainfall. The beginning of the winter sees average temperatures in the range of a chilly 5.6°C (42.1°F) to 10.6°C (51.1°F) as the prevailing foggy conditions exacerbate the cold.
The skies in Istanbul are mostly dark, and December is the cloudiest month, with hardly 2.7 hours of sunlight. The short days last for only 9 hours, while the nights hit the freezing mark sporadically.
The seawater is cold and does not inspire tourists to charter cruises or undertake any fun water activities.

What is the average temperature in December in Istanbul?

In Istanbul, Turkey, in December, the average high-temperature is 10.8°C (51.4°F), and the average low-temperature is 5.5°C (41.9°F).
Average temperature in December - Istanbul, Turkey
  • Average high temperature in December: 10.8°C

The warmest month (with the highest average high temperature) is August (26.7°C).
The month with the lowest average high temperature is January (8.5°C).

  • Average low temperature in December: 5.5°C

The month with the highest average low temperature is August (20°C).
The coldest month (with the lowest average low temperature) is February (3.1°C).

Average rainfall in December - Istanbul, Turkey
  • Average rainfall in December: 122.6mm

The wettest month (with the highest rainfall) is December (122.6mm).
The driest month (with the lowest rainfall) is July (31.6mm).

Average rainfall days in December - Istanbul, Turkey
  • Average rainfall days in December: 17.3 days

The month with the highest number of rainy days is January (17.5 days).
The month with the lowest number of rainy days is July (4.2 days).

Average snowfall days in December - Istanbul, Turkey
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (4.9 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in December - Istanbul, Turkey
  • Average sea temperature in December: 10.7°C

The best month for swimming (with the highest average sea temperature) is August (24.9°C).
The coldest month (with the lowest average sea temperature) is February (7.8°C).

Average daylight in December / Average sunshine in December - Istanbul, Turkey
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 2.2h

The month with most sunshine is July (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 2.2h).

Average UV index in December - Istanbul, Turkey
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 9).
The month with the lowest UV index is December (UV index 1).

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