Kōshi in September
7.3out of 10
Possible, with caveats
Warm and comfortable: highs around 28°C. Frequent rain: about 11 rainy days.
28°CAvg high
20°CAvg low
11Rainy days (160 mm)
12:11 hDaylight
06:05Sunrise · 18:17 Sunset
Why this score
- Warm and comfortable: highs around 28°C
- Frequent rain: about 11 rainy days
- Rain varies a lot between years (±4.1 days)
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±4.1 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 | 9°C | 2°C | 66 mm | 9 | – | – | 5.8 |
| February | 11°C | 3°C | 93 mm | 10 | – | – | 5.9 |
| March | 14°C | 6°C | 135 mm | 13 | – | – | 5.9 |
| April | 19°C | 10°C | 157 mm | 12 | – | – | 6.7 |
| May | 24°C | 15°C | 176 mm | 11 | – | – | 7.1 |
| June | 26°C | 19°C | 429 mm | 18 | – | – | 6.1 |
| July | 29°C | 23°C | 337 mm | 18 | – | – | 6.0 |
| August | 31°C | 24°C | 158 mm | 15 | – | – | 6.2 |
| September | 28°C | 20°C | 160 mm | 11 | – | – | 7.3 |
| October | 23°C | 14°C | 92 mm | 8 | – | – | 8.0 |
| November | 17°C | 8°C | 83 mm | 8 | – | – | 7.3 |
| December | 11°C | 3°C | 68 mm | 9 | – | – | 6.3 |
Frequently asked questions
How hot is Kōshi in September?
Daytime highs average 28°C and nights about 20°C.
When is the best time to visit Kōshi?
The best months are October.