Cool
Average highs are around 11°C, so pack for cooler days.
December verdict
Istanbul, Turkiye in December
Weather score18Poor
Poor for holiday weather
Average highs are around 11°C, so pack for cooler days. Sunshine averages 4.1h per day, so this is not one of the brighter months. Rainfall averages 126mm, so some wet days are possible.
December weather
Monthly averages
Temp
11°C
Rain
126mm
Sun
4.1h
Sea
12°C
Weather score
18
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 126mm, so some wet days are possible.
Limited sun
Sunshine averages 4.1h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 12°C, so the water can feel cool.
Map
Weather map
Compare Istanbul, Turkiye with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December11°C average high
December is on the cooler side of Istanbul's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December126mm average rain
December is one of Istanbul's wettest months, so rain is likely to be a major planning factor.
Driest monthsApril to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December4.1 hours average sun
December is one of Istanbul's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December12°C average sea
December is below Istanbul's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJune to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
December18 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
