Click on a day for an hourly weather forecast
The weather in Kos in September is very hot. The average temperatures are between 23°C and 25°C, drinking water regularly is advisable.
You can expect a few rainy days in Kos during September, but usually the weather is comfortable in September.
Our weather forecast can give you a great sense of what weather to expect in Kos in September 2025.
If you’re planning to visit Kos in the near future, we highly recommend that you review the 14 day weather forecast for Kos before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 14° / 12° | 8 | 23 | 0 | 195 mm | Ok | Kos in January |
| February | 15° / 13° | 6 | 22 | 0 | 129 mm | Good | Kos in February |
| March | 15° / 13° | 4 | 27 | 0 | 89 mm | Good | Kos in March |
| April | 18° / 16° | 2 | 28 | 0 | 48 mm | Good | Kos in April |
| May | 21° / 19° | 2 | 29 | 0 | 36 mm | Good | Kos in May |
| June | 24° / 22° | 1 | 29 | 0 | 20 mm | Perfect | Kos in June |
| July | 26° / 24° | 0 | 31 | 0 | 3 mm | Perfect | Kos in July |
| August | 27° / 25° | 0 | 31 | 0 | 2 mm | Perfect | Kos in August |
| September | 25° / 23° | 1 | 29 | 0 | 30 mm | Perfect | Kos in September |
| October | 22° / 20° | 4 | 27 | 0 | 92 mm | Good | Kos in October |
| November | 19° / 17° | 4 | 26 | 0 | 116 mm | Good | Kos in November |
| December | 16° / 14° | 7 | 24 | 0 | 176 mm | Ok | Kos in December |