Climate averages 1991–2020
Hiroshima weather
in July.
A hot, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Hiroshima: daytime highs average 29.1°C and nights cool to about 22.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 251 mm of rain on roughly 16 days, which makes July a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 13 min on an average July day.
The nearest other city in this atlas is Hatsukaichi (12 km away). In July its highs average 29.7°C, 0.6°C warmer than Hiroshima, with 255 mm of rain.
Among the 303 cities listed in Japan, Hiroshima ranks joint 60th of 303 for the warmest July highs and 232nd of 303 for the driest July (rainfall, lowest first). The mean July high of those 303 cities is 27.9°C; Hiroshima is 1.3°C warmer than that mean.
From July to August, average highs rise by 1.3°C to 30.4°C, and monthly rainfall falls from 251 mm to 157 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hiroshima climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.0°C1.1°C | 1.1°C | 55 | 9.5 | 10.110 h |
| February | 9.3°C1.3°C | 1.3°C | 68 | 9.9 | 10.911 h |
| March | 13.1°C3.9°C | 3.9°C | 110 | 11.7 | 11.912 h |
| April | 18.3°C8.7°C | 8.7°C | 124 | 10.3 | 13.013 h |
| May | 22.8°C13.8°C | 13.8°C | 143 | 10.3 | 13.914 h |
| June | 25.8°C18.5°C | 18.5°C | 215 | 14.3 | 14.414 h |
| July, selected | 29.1°C22.8°C | 22.8°C | 251 | 16.1 | 14.214 h |
| August | 30.4°C23.8°C | 23.8°C | 157 | 14.0 | 13.413 h |
| September | 26.9°C19.9°C | 19.9°C | 188 | 12.6 | 12.412 h |
| October | 21.5°C13.7°C | 13.7°C | 109 | 8.2 | 11.311 h |
| November | 15.9°C8.2°C | 8.2°C | 71 | 8.1 | 10.410 h |
| December | 10.3°C3.4°C | 3.4°C | 64 | 9.6 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Hatsukaichi in JulyJapan · 12 kmHigh 29.7°C · Low 23.4°C · 255 mm rain
- Kure in JulyJapan · 22 kmHigh 26.8°C · Low 22.8°C · 220 mm rain
- Higashihiroshima in JulyJapan · 26 kmHigh 28.1°C · Low 22.1°C · 225 mm rain
- Iwakuni in JulyJapan · 34 kmHigh 28.7°C · Low 23.4°C · 255 mm rain
- Mihara in JulyJapan · 58 kmHigh 29.3°C · Low 23.1°C · 207 mm rain
- Imabari in JulyJapan · 62 kmHigh 28.5°C · Low 24.0°C · 225 mm rain
- Shūnan in JulyJapan · 67 kmHigh 27.1°C · Low 21.5°C · 259 mm rain
- Matsuyama in JulyJapan · 69 kmHigh 29.7°C · Low 24.0°C · 239 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hiroshima) is explained once on the Hiroshima year overview and on the Sources, method and limits page.