Kosai in September
6.4out of 10
Possible, with caveats
Warm and comfortable: highs around 28°C. Very wet: about 15 rainy days.
28°CAvg high
21°CAvg low
15Rainy days (239 mm)
12:12 hDaylight
05:38Sunrise · 17:50 Sunset
Why this score
- Warm and comfortable: highs around 28°C
- Very wet: about 15 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rain in September varies a lot between years (±3.9 rainy days), so check the forecast closer to your trip. 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 | 10°C | 3°C | 65 mm | 6 | – | – | 6.4 |
| February | 11°C | 3°C | 86 mm | 8 | – | – | 6.3 |
| March | 14°C | 6°C | 133 mm | 11 | – | – | 6.2 |
| April | 19°C | 11°C | 151 mm | 11 | – | – | 6.9 |
| May | 23°C | 16°C | 170 mm | 11 | – | – | 7.2 |
| June | 26°C | 20°C | 246 mm | 16 | – | – | 6.2 |
| July | 30°C | 24°C | 246 mm | 16 | – | – | 5.8 |
| August | 32°C | 25°C | 146 mm | 16 | – | – | 6.0 |
| September | 28°C | 21°C | 239 mm | 15 | – | – | 6.4 |
| October | 23°C | 16°C | 209 mm | 12 | – | – | 7.0 |
| November | 18°C | 10°C | 110 mm | 9 | – | – | 7.1 |
| December | 12°C | 5°C | 66 mm | 6 | – | – | 6.7 |
Frequently asked questions
How hot is Kosai in September?
Daytime highs average 28°C and nights about 21°C.
When is the best time to visit Kosai?
The best months are May, November, October, April.