Best Time to Visit Koshigaya
Best time: May, Apr, Nov.
Aug is warmest (30.4°C high); Sep is rainiest (197 mm).
Koshigaya weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | 9.2 | -0.7 | 36 | 4.3 |
| Feb | 9.8 | 0.1 | 52 | 5.1 |
| Mar | 12.8 | 3.4 | 89 | 6 |
| Apr | 18.6 | 9 | 111 | 7.1 |
| May | 22.8 | 13.7 | 123 | 8 |
| Jun | 25.1 | 18 | 166 | 6.9 |
| Jul | 28.6 | 21.6 | 153 | 7.1 |
| Aug | 30.4 | 22.9 | 154 | 7.4 |
| Sep | 26.4 | 19.3 | 197 | 5.5 |
| Oct | 21.3 | 13.1 | 160 | 4.7 |
| Nov | 16.3 | 6.9 | 76 | 3.9 |
| Dec | 11.7 | 1.5 | 36 | 3.8 |
Average high temperature
Best months by activity
Overall: MayAprNov
Beaches: AugJulJunSep
Hiking: DecJanNovFeb
Sightseeing: AprMayNovDec
Koshigaya quick facts
What to pack
Cold months (Jan, Feb, Dec): warm layers and a coat.
Wet months (Apr, May, Jun, Jul, Aug, Sep, Oct): raincoat and umbrella.
Frequently asked questions
When is the best time to visit Koshigaya?
May, Apr, Nov.
What is the rainiest month?
Sep, about 197 mm.
What is the warmest month?
Aug, with average highs of 30.4°C.
Where to stay
See Koshigaya hotels · Book Koshigaya tours & activities
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Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.