Hiroshima weather in September
September is a fair month to visit Hiroshima: highs of 26°C (78°F) and about 170 mm (6.7 in) of rain on average. Nights average 17°C (63°F) and cloud cover 70% (NASA POWER, 2001–2025 averages). The sea averages 29°C (83°F). It is the 3rd wettest month of the year and the 3rd warmest. Compared with August, it is cooler and wetter; October brings highs of 20°C (69°F) and 113 mm (4.4 in) of rain.
Is September a good time to visit Hiroshima?
fair month Weather score 58/100.
September is a fair month in Hiroshima. The weather is usually best in May, Aug, Oct.
Does it rain a lot in Hiroshima in September?
Yes, it is one of the rainy months: about 170 mm (6.7 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Hiroshima in September?
Days average 26°C (78°F) and nights 17°C (63°F).
Hiroshima weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 6°C (42°F) | -2°C (28°F) | 63 mm | 75% | 12°C (53°F) | least pleasant |
| February | 8°C (46°F) | -1°C (29°F) | 75 mm | 74% | 10°C (50°F) | least pleasant |
| March | 12°C (53°F) | 1°C (33°F) | 109 mm | 68% | 11°C (51°F) | least pleasant |
| April | 17°C (63°F) | 6°C (42°F) | 125 mm | 66% | 14°C (58°F) | fair |
| May | 22°C (71°F) | 11°C (52°F) | 146 mm | 66% | 18°C (64°F) | best |
| June | 25°C (77°F) | 16°C (61°F) | 211 mm | 79% | 22°C (71°F) | fair |
| July | 28°C (83°F) | 21°C (69°F) | 260 mm | 74% | 28°C (82°F) | least pleasant |
| August | 30°C (85°F) | 21°C (71°F) | 122 mm | 66% | 29°C (85°F) | best |
| September | 26°C (78°F) | 17°C (63°F) | 170 mm | 70% | 29°C (83°F) | fair |
| October | 20°C (69°F) | 11°C (51°F) | 113 mm | 63% | 25°C (76°F) | best |
| November | 14°C (58°F) | 5°C (41°F) | 79 mm | 64% | 20°C (67°F) | fair |
| December | 8°C (47°F) | 0°C (32°F) | 84 mm | 72% | 15°C (58°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months