Weather in Istanbul in June

How June compares

June is the 3rd warmest month of the year in Istanbul and ranks 96th of 134 destinations we compare for June - see where else is hot in June. Within Turkey it is 16th of 18 (Turkey in June). Against London's average high of 19.6°C in June, Istanbul is 5.3°C warmer by day and 7.1°C warmer at night.

Daytime and night-time in June

The typical June day in Istanbul peaks at 24.9°C, but that is an average: the warmest 10% of days reach 28.4°C or more. Roughly 1 in 2 days top 25°C and 1 in 32 pass 30°C. Nights average 18.4°C; one night in ten drops to 15.8°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest June day here reached 34.8°C (2017-06-30) and the coldest night 11.8°C (1997-06-02).

Rain in June

Some rain (4-8 rainy days): about 6 days with 1 mm or more, 35 mm in total. Year to year it varies a lot - the wettest June was 1999 with 109 mm, the driest 2003 with 1 mm. Humidity averages 73%.

Sea temperature in June

The sea averages 20.8°C - bracing (18-22°c). Depending on the year it ranges from 19.7°C to 21.8°C. For the warmest sea here, come in August (24.4°C).

Sunshine and daylight

Around 10.4 hours of sunshine a day (estimated from cloud cover), 14.9 hours of daylight: the sun rises about 05:31 and sets about 20:38 local time in mid-June. Average cloud cover is 31%.

Is June a good time to visit Istanbul?

Yes - it is one of the better months: warm days, manageable rain and long sunny days. The best months for Istanbul on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug.

Warm enough for summer clothes, without constant heat

Istanbul feels noticeably warmer than London in June, with average daytime highs 5.3°C higher. That makes light, breathable clothing a sensible starting point, though walking in direct sun can still feel hot around midday. Humidity averages 73%, so leave room for shaded breaks rather than planning to stay on your feet throughout the afternoon. The usual warmth is better suited to a city break than to anyone seeking reliably fierce heat. If you find hot weather tiring, put your longer walks earlier in the day and keep the middle of the day flexible. A hat and sunscreen deserve space in your bag.

Long, sunny days with some rain to work around

June brings about 10.4 hours of sunshine within 14.9 hours of daylight, giving you plenty of scope to spend time outdoors without rushing. You can take a break during the warmest part of the day and still have daylight left afterwards. Rain remains a possibility, so this is not a month to pack as though every day will be dry. A compact umbrella or light waterproof is more useful than relying on sunshine throughout your stay. Keep an indoor option in mind and adjust your plans to the forecast, rather than treating the monthly pattern as a promise for your particular trip.

Comfortable evenings, but the sea is still bracing

The sea averages 20.8°C, which is bracing rather than comfortably warm. If swimming is central to your holiday, that is June's main catch: warm air does not mean equally welcoming water. The year-to-year sea temperature range is 20°C to 22°C, so your comfort will depend partly on how readily you tolerate cooler swims. For a trip focused on time around the city, this matters much less. Evenings are generally mild, but the cooler nights can fall to 15.8°C or below. Bring a light jumper or jacket for sitting outside after dark, even if you rarely need it during the day.