Weather in Kos for September 2025
Until now, September 2025 in Kos has been nearly identical to the historical average, with a temperature of 27.2 °C (showing only a slight deviation of -0.5 °C).
Expect cooler weather in the next days in Kos with the forecast suggesting a temperature of 25.1 °C, lower than the historical average.
In general, the average temperature in Kos at the beginning of September is 28 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.1 °C by the end of September.
With an average of 2 rainy days, Kos experiences minimal rainfall in September.
Is September a good time to visit Kos? check out the best time to travel to Kos page.
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Kos Weather September
Temperatures trend during September in Kos
September weather in Kos day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 27° /22° | 0 mm | 7 | |
| 2 Sept. | Sunny | 29° /23° | 0 mm | 7 | |
| 3 Sept. | Sunny | 28° /23° | 0 mm | 7 | |
| 4 Sept. | Sunny | 28° /22° | 0.5 mm | 7 | |
| 5 Sept. | Sunny | 27° /23° | 0.9 mm | 7 | |
| 6 Sept. | Sunny | 28° /23° | 0.1 mm | 7 | |
| 7 Sept. | Sunny | 29° /23° | 0 mm | 7 | |
| 8 Sept. | Sunny | 28° /22° | 0 mm | 7 | |
| 9 Sept. | Sunny | 27° /22° | 0 mm | 7 | |
| 10 Sept. |  Patchy rain possible | 27° /22° | 0.2 mm | 6 | |
| 11 Sept. | Sunny | 28° /22° | 1.3 mm | 7 | |
| 12 Sept. | Sunny | 27° /22° | 0.1 mm | 7 | |
| 13 Sept. | Sunny | 27° /22° | 0 mm | 7 | |
| 14 Sept. | Sunny | 27° /22° | 0 mm | 7 | |
| 15 Sept. | Sunny | 25° /23° | 0 mm | 1.6 | |
| 16 Sept. | Sunny | 27° /22° | 0 mm | 1.6 | |
| 17 Sept. | Sunny | 25° /22° | 0 mm | 1.7 | |
| 18 Sept. | Sunny | 26° /21° | 0 mm | 1.7 | |
| 19 Sept. | Sunny | 27° /20° | 0 mm | 2.1 | |
| 20 Sept. | Sunny | 26° /19° | 0 mm | 6 | |
| 21 Sept. | Sunny | 26° /21° | 0 mm | 6 | |
| 22 Sept. | Sunny | 24° /21° | 0 mm | 6 | |
| 23 Sept. | Sunny | 26° /21° | 0 mm | 6 | |
| 24 Sept. | Sunny | 25° /21° | 0 mm | 6 | |
| 25 Sept. | Sunny | 24° /21° | 0 mm | 6 | |
| 26 Sept. | Sunny | 24° /21° | 0 mm | 6 | |
| 27 Sept. | Sunny | 24° /21° | 0 mm | 6 | |
| 28 Sept. |  Partly cloudy | 23° /21° | 0 mm | 6 | |
| 29 Sept. | Sunny | 25° /21° | 0 mm | 7 | |
| 30 Sept. | Sunny | 24° /20° | 0.1 mm | 6 | |
| Next | |||||
Kos weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Sunny |
| Temperatures | 29°/24° | 27°/22° | 23°/19° |
| Rainfall | 0 mm | 5 mm | 1 mm |
| Wind | 21.7 km/h | 24 km/h | 19.7 km/h |
| Humidity | 63% | 63% | 60% |
| Rainy days | 0 days | 2 days | 0 days |
| Dry days | 31 days | 28 days | 31 days |
Planning a trip to Kos? Discover the best time to visit
Kos in September - FAQ
Kos water temperatures in September
The average water temperature of the Mediterranean Sea near Kos in September is 22.5 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in Kos in September?
- The average water temperature in Kos in September is 22.5 °C.
- Can you swim in Kos in September?
- Comfortably warm for most people. Sensitive swimmers might prefer a light rash-guard, but wetsuits are rarely needed.
What to pack to Kos in September?
As you prepare for your trip to Kos in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Kos, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Kos
UV exposure in Kos during September
Quick links
Where is Kos?Get accurate weather forecasts for Kos, located at latitude 36.893 and longitude 27.288. Stay updated with localized weather information tailored for Kos.