Climate Chart of Istanbul, Türkiye

Climate overview

Temperature

Monthly mean temperatures are coolest in January at 6.8 °C and warmest in August at 25.4 °C. These are averages for each month, not daytime maximum temperatures, so they describe the broad monthly pattern rather than the full range visitors may encounter during a day. Across the calendar months, the unweighted mean of the monthly mean temperatures is 15.5 °C. It is a summary of monthly averages, not a day-weighted annual average.

Rain

Mean daily rainfall is highest in January at 2.75 mm/day and lowest in August at 0.51 mm/day. The figures are daily means within those months, not monthly rainfall totals; the lower mean does not guarantee rain-free days or indicate how often rain occurs. The unweighted mean of the monthly daily-rainfall means is 1.85 mm/day. This offers a broad reference across the calendar, but does not show how rainfall is distributed from day to day.

Sunshine

Mean daily sunshine duration reaches its highest level in July at 13.27 hours/day, and its lowest in January at 5.41 hours/day. These are averages of sunshine hours per day, not measures of day length, and actual conditions can vary. The unweighted mean across the monthly sunshine-duration averages is 9.17 hours/day per day. It provides a general reference, rather than a promise of sunshine on a particular day.

Snow

The highest monthly mean daily snowfall is recorded in January at 3.78 mm/day. The unweighted mean across the monthly snowfall averages is 0.63 mm/day per day. These mean amounts do not establish how many days have snow, snow depth or cover, or whether conditions are suitable for skiing.