İzmit weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – September
What is the weather like in İzmit in September?
In September, İzmit is warm: daytime highs average 25 °C, and nights cool down to about 17 °C. The sea averages 23.1 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 60 mm. All in all, September is an excellent month for a holiday in İzmit.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 85 | 84 | 71 |
| Day | 29° | 25° | 20° |
| Night | 20° | 17° | 13° |
| Sea | 25° | 23° | 20° |
| Sun | 9 h | 7 h | 4 h |
| Rain days | 6 | 8 | 10 |
More details for September
- Daylight
- 12 h 32 min06:40 – 19:12
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 43 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3Europe/Istanbul
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %63 %
- Few rainy daysweight 30 %70 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Rain jacket or umbrella
İzmit in September: quick answers
Is İzmit hot in September?
Warm rather than hot: in September, daytime highs in İzmit average 25 °C and nights cool to about 17 °C. On about 3 days the thermometer climbs to 30 °C or more.
Can you swim in İzmit in September?
Yes. In September the sea averages 23.1 °C – pleasant for swimming.
Does it rain much in İzmit in September?
Rain falls on about 8 days, adding up to 60 mm.
İzmit month by month
The whole year in İzmitAll destinations: TurkeyWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences