The highest day temperature in January 2026 was 60°F. The lowest night temperature was 31°F. The average values for day and night temperatures during January were 47.5°F и 44.4°F respectivly.

The average sea surface temperature in January 2026 for Istanbul was 51.4°F. The maximum and minimum values were 49.4°F and 53.6°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Istanbul is 2.5 in. It makes january the most rainy month of the year.

The average wind speed in January is 11.6 mph.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Istanbul in January is 4.5 hours.