Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
Weather Guide
Istanbul, Turkiye Average Monthly Weather
Weather score48Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 18°C, sunshine averages 7.6h per day, and rainfall totals about 773mm. Sea temperatures average 16°C across the year.
Annual weather
Annual averages
Temp
18°C
Rain
773mm
Annual total
Sun
7.6h
Sea
16°C
Weather score
48
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 25mm, which is relatively low for holiday planning.
Bright
Sunshine averages 12h per day, so bright days are a strong part of the month.
Swimmable
Sea temperatures average 24°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Istanbul, Turkiye with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July27°C average high
July is one of Istanbul's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
July25mm average rain
July is one of Istanbul's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsApril to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July12 hours average sun
July is one of Istanbul's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
July24°C average sea
July is one of Istanbul's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJune to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
July87 weather score
July is one of Istanbul's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
