Weather in Istanbul in January

How January compares

January is the 12th warmest month of the year in Istanbul and ranks 120th of 134 destinations we compare for January - see where else is hot in January. Within Turkey it is 18th of 18 (Turkey in January). Against London's average high of 7.4°C in January, Istanbul is 0.8°C warmer by day and 1.9°C warmer at night.

Daytime and night-time in January

The typical January day in Istanbul peaks at 8.2°C, but that is an average: the warmest 10% of days reach 12.9°C or more. Days over 25°C are rare. Nights average 4.1°C; one night in ten drops to -0.1°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest January day here reached 17.8°C (2010-01-01) and the coldest night -7.8°C (2000-01-27).

Rain in January

Wet (more than 8 rainy days): about 12 days with 1 mm or more, 85 mm in total. Year to year it varies a lot - the wettest January was 2004 with 156 mm, the driest 2001 with 29 mm. Humidity averages 79%.

Sea temperature in January

The sea averages 8.4°C - too cold for most (under 18°c). Depending on the year it ranges from 7.0°C to 9.7°C. For the warmest sea here, come in August (24.4°C).

Sunshine and daylight

Around 3.1 hours of sunshine a day (estimated from cloud cover), 9.4 hours of daylight: the sun rises about 08:27 and sets about 17:59 local time in mid-January. Average cloud cover is 67%.

Is January a good time to visit Istanbul?

January is not the strongest month here: cool days and frequent rain. The best months for Istanbul on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug.

Expect winter layers, not a warmer-weather break

January is Istanbul's coldest month, and its average daytime high is just 0.8°C above London's. That is too small a difference to plan around as a change of climate. A warm coat, layers and gloves make more sense than lighter holiday clothes, particularly if you expect to be outside into the evening. Milder days can reach around 13°C, but the coldest nights drop below freezing, so do not pack for the mild end alone. Midday is a sensible time for longer outdoor stretches, with somewhere warm to pause afterwards. This month suits travellers who tolerate cold well; anyone hoping to sit outside comfortably for long periods should choose a warmer month.

Keep plans flexible around rain and short days

Rain is a practical drawback rather than a reason to rule the trip out. With about 12 rainy days, a waterproof outer layer and shoes that cope with wet pavements deserve space in your bag. That figure does not mean every wet day is a washout, but a rigid outdoor schedule is a poor fit. Sunshine averages about 3.1 hours within 9.4 hours of daylight, so do not mistake available daylight for clear skies. Put your outdoor priorities into the daylight window and leave room to switch indoors when conditions turn. Evenings are better approached as the colder part of the day, with warm clothing ready rather than an expectation of lingering outside.