Weather in Istanbul in May

Prime time. If you get to pick your dates, May is the one. Highs average 21.3 °C, lows 14 °C, and rain falls on 7 days — nothing in the month is working against you.

May is the highest-scoring month of the twelve. The nearest rival is June, and the month at the other end of the year is January.

Rain on 7 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average May reaches 30 °C. Across the twenty years measured, the hottest May day reached 30.3 °C and the coldest night fell to 7.4 °C.

May is moderately variable: 6 mm in the driest year against 75 mm in the wettest, around an average of 35 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 12 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 74%.

How May sits in the year

The month is on the way up: 5.3 °C warmer than April, and June adds another 4.8 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in May

14.4 hours of daylight, gaining 1 hours across the month. That is between Istanbul's extremes of 15.1 and 9.3 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 15.8 °C in May — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. The sea peaks at 25.6 °C in August and bottoms out at 7.5 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

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.

May in Istanbul versus nearby

If Istanbul is one option among several, the nearby comparison is worth making. Bursa is close enough to be a coin toss — 3.5 °C warmer, 1 day more rain. Eskişehir is close enough to be a coin toss — within a degree on temperature, 3 days more rain.

So: May is the answer for Istanbul. If it is booked out or priced out, June is the next best thing at 1 points behind, and January is the month to keep off the shortlist.

Every month in Istanbul

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