Climate averages 1991–2020
Derince weather
in September.
A warm, moderately wet month: the 4th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Derince: daytime highs average 25.1°C and nights cool to about 16.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 56 mm of rain on roughly 8 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 30 min on an average September day.
The nearest other city in this atlas is İzmit (10 km away). In September its highs average 25.0°C, about as warm as Derince, with 61 mm of rain.
Among the 138 cities listed in Turkey, Derince ranks joint 92nd of 138 for the warmest September highs and joint 123rd of 138 for the driest September (rainfall, lowest first). The mean September high of those 138 cities is 27.1°C; Derince is 2.0°C cooler than that mean.
From September to October, average highs fall by 4.6°C to 20.5°C, and monthly rainfall rises from 56 mm to 81 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Derince climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.9°C1.7°C | 1.7°C | 95 | 13.5 | 9.610 h |
| February | 10.2°C2.0°C | 2.0°C | 82 | 12.8 | 10.611 h |
| March | 13.2°C4.1°C | 4.1°C | 88 | 13.0 | 11.912 h |
| April | 17.8°C7.8°C | 7.8°C | 66 | 10.8 | 13.313 h |
| May | 22.3°C12.6°C | 12.6°C | 59 | 9.2 | 14.414 h |
| June | 26.1°C16.9°C | 16.9°C | 63 | 9.5 | 15.015 h |
| July | 28.2°C19.3°C | 19.3°C | 38 | 5.9 | 14.815 h |
| August | 28.5°C19.9°C | 19.9°C | 36 | 5.5 | 13.814 h |
| September, selected | 25.1°C16.7°C | 16.7°C | 56 | 7.9 | 12.513 h |
| October | 20.5°C12.8°C | 12.8°C | 81 | 10.3 | 11.211 h |
| November | 15.5°C7.6°C | 7.6°C | 75 | 10.1 | 10.010 h |
| December | 10.5°C3.7°C | 3.7°C | 103 | 13.0 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- İzmit in SeptemberTurkey · 10 kmHigh 25.0°C · Low 16.5°C · 61 mm rain
- Gebze in SeptemberTurkey · 33 kmHigh 23.7°C · Low 16.6°C · 45 mm rain
- Yalova in SeptemberTurkey · 47 kmHigh 25.4°C · Low 17.6°C · 48 mm rain
- Adapazarı in SeptemberTurkey · 50 kmHigh 24.4°C · Low 14.8°C · 56 mm rain
- Sultanbeyli in SeptemberTurkey · 51 kmHigh 23.7°C · Low 17.5°C · 48 mm rain
- Sancaktepe in SeptemberTurkey · 56 kmHigh 23.7°C · Low 18.0°C · 48 mm rain
- Ümraniye in SeptemberTurkey · 65 kmHigh 23.5°C · Low 17.9°C · 46 mm rain
- Gemlik in SeptemberTurkey · 66 kmHigh 26.1°C · Low 18.3°C · 54 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Derince) is explained once on the Derince year overview and on the Sources, method and limits page.