Climate averages 1991–2020
Hiroshima weather
in April.
A mild, wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Hiroshima: daytime highs average 18.3°C and nights cool to about 8.7°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 124 mm of rain on roughly 10 days, which makes April a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 01 min on an average April day.
The nearest other city in this atlas is Hatsukaichi (12 km away). In April its highs average 18.7°C, about as warm as Hiroshima, with 138 mm of rain.
Among the 303 cities listed in Japan, Hiroshima ranks joint 39th of 303 for the warmest April highs and joint 155th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Hiroshima is 1.6°C warmer than that mean.
From April to May, average highs rise by 4.5°C to 22.8°C, and monthly rainfall rises from 124 mm to 143 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Hatsukaichi in AprilJapan · 12 kmHigh 18.7°C · Low 9.3°C · 138 mm rain
- Kure in AprilJapan · 22 kmHigh 16.2°C · Low 10.1°C · 136 mm rain
- Higashihiroshima in AprilJapan · 26 kmHigh 17.3°C · Low 8.1°C · 117 mm rain
- Iwakuni in AprilJapan · 34 kmHigh 17.8°C · Low 9.9°C · 138 mm rain
- Mihara in AprilJapan · 58 kmHigh 18.4°C · Low 8.9°C · 110 mm rain
- Imabari in AprilJapan · 62 kmHigh 17.5°C · Low 11.0°C · 132 mm rain
- Shūnan in AprilJapan · 67 kmHigh 16.2°C · Low 7.9°C · 147 mm rain
- Matsuyama in AprilJapan · 69 kmHigh 18.7°C · Low 10.3°C · 133 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.