Weather in Istanbul in July

Prime time. July is about as good as Istanbul gets. Highs average 29 °C, lows 21.6 °C, and rain falls on 4 days — nothing in the month is working against you.

July ranks 4 of 12 in Istanbul: past the worst of the year but short of May, which is the month to book if the dates are open.

Rain falls on only 4 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 29 °C days and 21.6 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 10 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest July day reached 38.2 °C and the coldest night fell to 17.3 °C, and the wettest single day dropped 41 mm — roughly 205% of the month's rain in one day.

This is the volatile part. July rainfall has ranged from 1 mm to 66 mm across the twenty years measured — a 65 mm spread around an average of 20 mm. The average is real but almost no individual July looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 15.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 66%.

How July sits in the year

Temperatures hold steady either side: 26.1 °C in June, 29 here, 29.4 in August. Nothing about the timing within the month matters much.

Daylight in July

July is at or near the longest days of Istanbul's year: 14.9 hours of daylight, losing 0.6 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 24.7 °C in July — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

July in Istanbul versus nearby

If Istanbul is one option among several, the nearby comparison is worth making. Bursa is the weaker option in July — 3.9 °C warmer, 1 day less rain. Eskişehir is the weaker option in July — within a degree on temperature, the same number of rain days.

So: July is effectively as good as it gets here — 2 points behind May, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Istanbul

See all twelve months in Istanbul, or where else to go in July.