What is the weather like in Hiroshima vs Karuizawa in September?

In September, Hiroshima averages 30°C high / 22°C low with about 221 mm of rain; Karuizawa averages 21°C high / 13°C low with about 179 mm.

Hiroshima vs Karuizawa in September

Karuizawa is the better pick in September — 78 vs 63 on SeasonMap's comfort score. Karuizawa is nice, soaked, clean air, while Hiroshima is hot, soaked, clean air.

Hiroshima vs Karuizawa — September climate, side by side

	🇯🇵 Hiroshima	🇯🇵 Karuizawa
Comfort score	63/100 (C)	78/100 (B)
Feels-like high	33°C	23°C
Avg high / low	30° / 22°	21° / 13°
Rainfall	221 mm	179 mm
Rainy days	15	21
Humidity	82%	87%
Air quality (AQI)	43	40

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Hiroshima vs Karuizawa in September — FAQ

Is September better in Hiroshima or Karuizawa?: Karuizawa is the better pick in September — 78 vs 63 on SeasonMap's comfort score. Karuizawa is nice, soaked, clean air, while Hiroshima is hot, soaked, clean air.
What is the weather like in Hiroshima vs Karuizawa in September?: In September, Hiroshima averages 30°C high / 22°C low with about 221 mm of rain; Karuizawa averages 21°C high / 13°C low with about 179 mm.