May weather forecast and climate
Istanbul, Turkey

Ships along the coast of the port city of Istanbul, Turkey, with a background view of the cityscape
Ships along the coast of the port city of Istanbul, Turkey, with a background view of the cityscape
May is sunny and beautiful as the spring blooms over Istanbul. The 14-hour days host the sun for a daily 8.5 hours. The temperatures are in the comfortable 12.2°C (54°F) to 20°C (68°F) range as the bright conditions bring joy to the city. The rainfall hardly touches 33mm (1.3") as late spring is mostly dry.
May sees an influx of tourists to visit historical places and bask in the sunshine. The narrow strait is full of ships of all sizes and colors as the fog disappears in the brilliant sunlight. May is one of the best times to visit Istanbul!

What is the temperature in May in Istanbul?

In May, in Istanbul, the average high-temperature is 20°C (68°F), and the average low-temperature is 12.1°C (53.8°F).
Average temperature in May - Istanbul, Turkey
  • Average high temperature in May: 20°C

The warmest month (with the highest average high temperature) is August (26.7°C).
The month with the lowest average high temperature is January (8.5°C).

  • Average low temperature in May: 12.1°C

The month with the highest average low temperature is August (20°C).
The coldest month (with the lowest average low temperature) is February (3.1°C).

Average rainfall in May - Istanbul, Turkey
  • Average rainfall in May: 34.1mm

The wettest month (with the highest rainfall) is December (122.6mm).
The driest month (with the lowest rainfall) is July (31.6mm).

Average rainfall days in May - Istanbul, Turkey
  • Average rainfall days in May: 8.1 days

The month with the highest number of rainy days is January (17.5 days).
The month with the lowest number of rainy days is July (4.2 days).

Average snowfall days in May - Istanbul, Turkey
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (4.9 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in May - Istanbul, Turkey
  • Average sea temperature in May: 15.7°C

The best month for swimming (with the highest average sea temperature) is August (24.9°C).
The coldest month (with the lowest average sea temperature) is February (7.8°C).

Average daylight in May / Average sunshine in May - Istanbul, Turkey
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in May: 8.1h

The month with most sunshine is July (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 2.2h).

Average UV index in May - Istanbul, Turkey
  • Average UV index in May: 7

The month with the highest UV index is July (UV index 9).
The month with the lowest UV index is December (UV index 1).

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