14-day forecast — Istanbul
Updated every hour
Sun · Today · 13 Sep
Showers
23°
21°
0.5 mm
Mon · Tomorrow · 14 Sep
Showers
23°
20°
1.1 mm
Tuesday · 15 Sep
Sunny
24°
19°
4%
Wednesday · 16 Sep
Sunny
25°
20°
4%
Thursday · 17 Sep
Sunny
25°
19°
5%
Friday · 18 Sep
Cloudy
26°
20°
11%
Saturday · 19 Sep
Sunny
25°
21°
10%
Sunday · 20 Sep
Sunny
25°
20°
4%
Monday · 21 Sep
Sunny
26°
21°
8%
Tuesday · 22 Sep
Sunny
27°
20°
5%
Wednesday · 23 Sep
Sunny
27°
21°
3%
Thursday · 24 Sep
Sunny intervals
24°
20°
6%
Friday · 25 Sep
Sunny
20°
17°
0.3 mm
Saturday · 26 Sep
Sunny
20°
16°
4%
About Istanbul
Where Europe meets Asia — Hagia Sophia, the Grand Bazaar and the Bosphorus.
CountryTurkey
RegionMarmara
ContinentEurope
Time zoneEurope/Istanbul (+03:00)
Latitude41.0082°
Longitude28.9784°
Air qualityFair (EAQI 33)
Climate in Istanbul in September
Averages over 8 years · best time to visitBest time to visit Istanbul: April–October. With perfect weather, September is a recommended month to visit.
| August | September | October | |
|---|---|---|---|
| Average temperature | ▼ 25°C | 21°C | ▼ 17°C |
| Highest temperature | ▼ 30°C | 26°C | ▼ 21°C |
| Lowest temperature | ▼ 21°C | 18°C | ▼ 14°C |
| Sea temperature | ▼ 25,2°C | 24,2°C | ▼ 19,9°C |
| Rainfall | ▲ 19 mm | 44 mm | ▲ 55 mm |
| Days with rain | ▲ 3 d | 8 d | ▼ 7 d |
| Humidity | ▲ 65% | 72% | ▲ 76% |
| Sunshine hours per day | ▼ 12,6 h | 10,9 h | ▼ 8,6 h |
| Cloud cover | ▲ 8% | 13% | ▲ 23% |
| UV index (midday) | ▼ 10 | 7 | ▼ 5 |
| Day length | 13:46 | 12:28 | 11:06 |
| Our rating | Perfect | Perfect | Good |
Temperature day by day in September mean + moving average
Rainfall day by day in September mm
UV index day by day in September midday value, clear-sky
Climate averages calculated from the ERA5 archive (8 years; sea temperature from marine reanalysis). UV estimated from solar elevation.
Other destinations in Europe
Data source
Global weather models — international forecasts
The weather for Istanbul is based on global weather models (ECMWF, GFS) and national meteorological institutes around the world. Forecasts update every hour; current measurements every 15 minutes. For destinations with a larger time difference from the UK, local time is shown above.