September is an ideal time to visit Istanbul if you're seeking a destination with brilliant weather. Anticipate average maximum temperatures of +75°F and about 17 sunny days, ensuring you'll have ample opportunities to soak up the sunshine. It's worth noting, though, that there may be some rainfall, with approximately 31 mm of precipitation over an average of 6 rainy days. So, prepare your sunglasses, a beach towel, and great walking shoes, as it's most likely going to be amazing weather. Search flightsin one click on Avionero.
Average weather
☀️
+75°F
Avg. max. temperature
+54°F
Min.
+97°F
Max.
31 mm
Total precipitation
67%
Avg. humidity
3 m/s
Avg. wind
17 ☀️
Sunny Days
5 ⛅️
Cloudy
6 🌦
Rainy
Our opinion: Istanbul has great weather in September.
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Average temperature in Istanbul in September
Here are the expected maximum, average and minimum temperatures in Istanbul for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +84°F during the day to a minimum of +63°F during the night, the temperature in September averages around +79°F.
The average maximum temperature goes down 42% by the end of the month, compared with the beginning of the month, from +82°F to +73°F.
Is Istanbul warm or cold in September?
Istanbul is typically warm in September.
Maximum temperatures go down compared to the previous month from +82°F to +75°F. The minimum temperature also goes down from +72°F to +66°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Istanbul:
Water temperature in Istanbul in September
Water in Istanbul in September is Comfortable. It varies from +69°F to +76°F, with an average of +73°F.This is almost similar to the air temperature, which averages +75°F.
The water temperature in September is one of the warmest of the entire year:
The warmest water temperatures in Istanbul are reached in August, when the average sea temperature rises to +77°F. The coldest water temperatures are in February, with an average of +46°F.
Can you swim in Istanbul in September?
The water in Istanbul in September is pretty comfortable (+73°F in average). Ideal for swimming, especially in outdoor pools and open water. Suitable for recreational and casual swimmers.
🦭
Cold
Below +61°F
🏄♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
Don’t forget a large beach towel or two for drying off.
Climate in Istanbul in September
Istanbul weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+82°F
+75°F
+66°F
Min. temperature
+61°F
+54°F
+41°F
Max. temperature
+95°F
+97°F
+88°F
Rainfall
14 mm
31 mm
57 mm
Wind
4 m/s
3 m/s
3 m/s
Avg. water temperature
+77°F
+73°F
+66°F
Humidity
66%
67%
73%
Air pressure
1012 HPa
1015 HPa
1018 HPa
Sunny days
22
17
12
Cloudy days
3
5
8
Rainy days
5
6
10
Snowy days
0
0
0
September weather is still as great as in August.It’s getting colder in September. From +82°F in the day, the average maximum temperature lowers to +75°F.Prepare for more rain. Average rainfall goes from 14 mm to 31 mm.Humidity rises from 66% to 67%.Winds are calmer in comparison to August, going down from 4 m/s to 3 m/s on average.The days becoming less sunny, going from 22 sunny days in August to 17 in September.
Next month (October) brings a further decline in the weather.
Wind speed in Istanbul in September based on historical data.
Last Year
Historical Data
The average wind speed is 5 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Istanbul is gradually decreasing during September, going from 4 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Istanbul based on historical data.
Last Year
Historical Data
Typically, there is a 20% chance of rain on an average day in September, with total rainfall of approximately 28 mm. The maximum amount of rainfall per day is around 11 mm, which is considered light rain.On average, there are about 6 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Istanbul wettest month is December, where a typical day has a 45% chance of precipitation and 81 mm of rainfall per day. August, on the other hand, is the driest month with a mere 16% chance of precipitation and 14 mm of rainfall per day.
How was the weather last September in Istanbul?
This is the weather in Istanbul in September 2023:
1 September
☀️
+83°F
2 September
☀️
+83°F
3 September
🌧️
+80°F
4 September
☀️
+81°F
5 September
☁️
+79°F
6 September
☁️
+81°F
7 September
☁️
+81°F
8 September
☁️
+79°F
9 September
☀️
+78°F
10 September
☀️
+77°F
11 September
☀️
+76°F
12 September
☀️
+77°F
13 September
☀️
+78°F
14 September
☀️
+80°F
15 September
☀️
+80°F
16 September
☀️
+79°F
17 September
☁️
+78°F
18 September
☁️
+76°F
19 September
☀️
+77°F
20 September
☀️
+76°F
21 September
☀️
+77°F
22 September
☀️
+80°F
23 September
☀️
+85°F
24 September
☀️
+82°F
25 September
☁️
+78°F
26 September
☁️
+78°F
27 September
☁️
+77°F
28 September
🌧️
+75°F
29 September
🌧️
+74°F
30 September
🌧️
+74°F
In September 2023 Istanbul had 17 sunny days, 9 cloudy days, and 4 rainy days. The average maximum temperature was +79°F, with an absolute maximum of +84°F and a minimum of +73°F. The average humidity was 73%, with a maximum of 100% and a minimum of 46%. The average wind speed was 5 m/s, with a maximum of 12 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Istanbul climate has changed over the last 43 years.
The climate in Istanbul in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1997 (+61°F) and the highest in 2019 (+68°F). The driest year was 1984 with only 361 mm of rainfall, and the wettest year was 2010 with 859 mm.
FAQ
Frequently asked questions about the weather in Istanbul in September:
Is September a good time to visit Istanbul?
Yes, September is a great time to go to Istanbul, the weather couldn’t be better. Be ready to get outside, explore and enjoy. Check what other months that are a good time to visit Istanbul.
Can you sunbathe in Istanbul in September?
September is warm in Istanbul. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Can you swim in Istanbul in September?
Yes, the water temperature in Istanbul in September is considered moderate and enjoyable for most people, averaging around +73°F.
Is Istanbul rainy in September?
Istanbul is usually dry in September. Plan your packing around outdoor activities and exploring.
Is it sunny in Istanbul in September?
The amount of sunny days in Istanbul during September varies; prepare for a mix of clouds and sun.
For this page, we’ve looked at the typical weather in Istanbul, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
