Climate averages 1991–2020
Iwakuni 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 Iwakuni: daytime highs average 17.8°C and nights cool to about 9.9°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 138 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 (23 km away). In April its highs average 18.7°C, 0.9°C warmer than Iwakuni, with 138 mm of rain.
Among the 303 cities listed in Japan, Iwakuni ranks joint 94th of 303 for the warmest April highs and joint 214th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Iwakuni is 1.1°C warmer than that mean.
From April to May, average highs rise by 4.3°C to 22.2°C, and monthly rainfall rises from 138 mm to 158 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
Iwakuni climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.5°C2.8°C | 2.8°C | 50 | 6.2 | 10.210 h |
| February | 9.6°C2.8°C | 2.8°C | 69 | 8.0 | 10.911 h |
| March | 13.0°C5.3°C | 5.3°C | 116 | 10.1 | 11.912 h |
| April, selected | 17.8°C9.9°C | 9.9°C | 138 | 9.7 | 13.013 h |
| May | 22.2°C14.8°C | 14.8°C | 158 | 10.3 | 13.914 h |
| June | 25.1°C19.1°C | 19.1°C | 234 | 13.9 | 14.414 h |
| July | 28.7°C23.4°C | 23.4°C | 255 | 15.2 | 14.214 h |
| August | 29.8°C24.4°C | 24.4°C | 169 | 14.4 | 13.413 h |
| September | 26.5°C20.9°C | 20.9°C | 185 | 11.7 | 12.412 h |
| October | 21.5°C15.5°C | 15.5°C | 116 | 8.0 | 11.411 h |
| November | 16.1°C10.1°C | 10.1°C | 72 | 7.1 | 10.410 h |
| December | 10.8°C5.1°C | 5.1°C | 60 | 6.7 | 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 · 23 kmHigh 18.7°C · Low 9.3°C · 138 mm rain
- Kure in AprilJapan · 33 kmHigh 16.2°C · Low 10.1°C · 136 mm rain
- Hiroshima in AprilJapan · 34 kmHigh 18.3°C · Low 8.7°C · 124 mm rain
- Shūnan in AprilJapan · 37 kmHigh 16.2°C · Low 7.9°C · 147 mm rain
- Higashihiroshima in AprilJapan · 55 kmHigh 17.3°C · Low 8.1°C · 117 mm rain
- Hōfu in AprilJapan · 61 kmHigh 18.1°C · Low 9.4°C · 141 mm rain
- Matsuyama in AprilJapan · 62 kmHigh 18.7°C · Low 10.3°C · 133 mm rain
- Yamaguchi in AprilJapan · 69 kmHigh 17.9°C · Low 8.4°C · 130 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 Iwakuni) is explained once on the Iwakuni year overview and on the Sources, method and limits page.
Hatsukaichi lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.