Measurements:
°C
°F
CURRENT WEATHER
04:44
Istanbul
64°F
S 19 mph
Feels like: 64°F
Precip: 73%
World Resorts Turkey Istanbul Weather

7 Day Weather Forecast

09.29
tue
DAY
66°F
S 16 mph
precip
64%
NIGHT
66°F
SW 13 mph
precip
49%
09.30
wed
DAY
70°F
SW 20 mph
precip
9%
NIGHT
66°F
SW 15 mph
precip
10%
10.01
thu
DAY
70°F
SW 18 mph
precip
11%
NIGHT
64°F
SW 12 mph
precip
34%
10.02
fri
DAY
66°F
S 13 mph
precip
46%
NIGHT
62°F
SW 6 mph
precip
20%
10.03
sat
DAY
68°F
SW 7 mph
precip
19%
NIGHT
64°F
W 5 mph
precip
61%
10.04
sun
DAY
62°F
SW 5 mph
precip
34%
NIGHT
60°F
NE 4 mph
precip
17%
10.05
mon
DAY
58°F
SE 8 mph
precip
23%
NIGHT
60°F
E 11 mph
precip
36%

Istanbul Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Istanbul was 22.7°F. The maximum and minimum values were 21.3°F and 24.1°F respectively.

Istanbul on the Weather Map

Best Time to Visit Istanbul
The most sunny months:
July 28 days
August 28 days
June 23 days
The most warm months:
July 88.7 °F
August 88.4 °F
June 83.1 °F
Warmest sea temperature:
August 78.6 °F
July 77.1 °F
September 76.0 °F
The most cold months:
January 48.5 °F
February 49.8 °F
December 53.2 °F
The most rainy months:
January 5 days
December 4 days
February 3 days
The most windy months:
August 13 mph
July 12 mph
September 11 mph
more details