Hiroshima Climate by Month
Hiroshima, Japan
Hot summers and cool winters, with rain spread through the year.
Hot summers and cool winters, with rain spread through the year: that's Hiroshima's climate in short. Expect highs of 90°F (32°C) in August and 49°F (10°C) in January, with the coldest nights (January) near 35°F (2°C). It gets 73 in (1856 mm) of rain a year, spread across the months.
- Warmest month
- 90°F(32°C)
- Average high, August
- Coldest nights
- 35°F(2°C)
- Average low, January
- Rain per year
- 73 in(1856 mm)
- No clear rainy season
- Humidity
- 67%
- Sunniest: May
Best and worst months in Hiroshima
Best for weatherThe most comfortable weather comes in May and October, with highs around 74°F (24°C) and about 6.4 in (163 mm) of rain a month.
Least pleasantJanuary and July are the least pleasant; July is the wettest, with 10 in (266 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Hiroshima weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 49°F(10°C) | 35°F(2°C) | 2.4 in(62 mm) | 65% | 2.3 |
| FebFebruary | 51°F(11°C) | 36°F(2°C) | 3.0 in(76 mm) | 62% | 2.9 |
| MarMarch | 57°F(14°C) | 41°F(5°C) | 5.4 in(137 mm) | 67% | 3.8 |
| AprApril | 67°F(19°C) | 49°F(10°C) | 6.0 in(152 mm) | 61% | 4.7 |
| MayMayBest | 75°F(24°C) | 58°F(15°C) | 6.9 in(175 mm) | 63% | 5.2 |
| JunJune | 80°F(27°C) | 67°F(19°C) | 10 in(260 mm) | 72% | 4.7 |
| JulJuly | 87°F(30°C) | 74°F(24°C) | 10 in(266 mm) | 73% | 4.9 |
| AugAugust | 90°F(32°C) | 76°F(25°C) | 7.6 in(193 mm) | 70% | 5.1 |
| SepSeptember | 83°F(28°C) | 69°F(20°C) | 8.9 in(226 mm) | 72% | 4.0 |
| OctOctoberBest | 74°F(23°C) | 58°F(15°C) | 5.9 in(151 mm) | 69% | 3.4 |
| NovNovember | 64°F(18°C) | 47°F(9°C) | 3.7 in(93 mm) | 66% | 2.5 |
| DecDecember | 54°F(12°C) | 38°F(4°C) | 2.6 in(65 mm) | 66% | 2.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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