Koster in September
8.8out of 10
Yes, a good time to go
Warm and comfortable: highs around 27°C. Very dry: about 2 rainy days.
27°CAvg high
12°CAvg low
2Rainy days (13 mm)
11:51 hDaylight
06:11Sunrise · 18:02 Sunset
Why this score
- Warm and comfortable: highs around 27°C
- Very dry: about 2 rainy days
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
- Shorts or a light skirt
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (2.1 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 28°C | 18°C | 98 mm | 14 | – | – | 7.1 |
| February | 28°C | 18°C | 96 mm | 13 | – | – | 7.3 |
| March | 27°C | 16°C | 76 mm | 11 | – | – | 7.6 |
| April | 24°C | 12°C | 36 mm | 6 | – | – | 8.2 |
| May | 22°C | 8°C | 18 mm | 2 | – | – | 8.8 |
| June | 20°C | 5°C | 8 mm | 1 | – | – | 8.6 |
| July | 20°C | 5°C | 3 mm | 1 | – | – | 8.7 |
| August | 23°C | 8°C | 7 mm | 1 | – | – | 8.9 |
| September | 27°C | 12°C | 13 mm | 2 | – | – | 8.8 |
| October | 28°C | 15°C | 52 mm | 8 | – | – | 8.1 |
| November | 28°C | 16°C | 78 mm | 12 | – | – | 7.5 |
| December | 28°C | 17°C | 121 mm | 15 | – | – | 6.9 |
Frequently asked questions
How hot is Koster in September?
Daytime highs average 27°C and nights about 12°C.
When is the best time to visit Koster?
The best months are August, May, September, July.