Climate averages 1991–2020
Iwakuni weather
in June.
A warm, very wet month: the 4th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in Iwakuni: daytime highs average 25.1°C and nights cool to about 19.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 234 mm of rain on roughly 14 days, which makes June a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 23 min on an average June day.
The nearest other city in this atlas is Hatsukaichi (23 km away). In June its highs average 26.3°C, 1.2°C warmer than Iwakuni, with 234 mm of rain.
Among the 303 cities listed in Japan, Iwakuni ranks joint 110th of 303 for the warmest June highs and joint 229th of 303 for the driest June (rainfall, lowest first). The mean June high of those 303 cities is 24.4°C; Iwakuni is 0.7°C warmer than that mean.
From June to July, average highs rise by 3.6°C to 28.7°C, and monthly rainfall rises from 234 mm to 255 mm.
The annual picture
June 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 | 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, selected | 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
June in nearby cities
- Hatsukaichi in JuneJapan · 23 kmHigh 26.3°C · Low 19.1°C · 234 mm rain
- Kure in JuneJapan · 33 kmHigh 23.2°C · Low 18.7°C · 226 mm rain
- Hiroshima in JuneJapan · 34 kmHigh 25.8°C · Low 18.5°C · 215 mm rain
- Shūnan in JuneJapan · 37 kmHigh 23.6°C · Low 17.2°C · 264 mm rain
- Higashihiroshima in JuneJapan · 55 kmHigh 24.8°C · Low 17.7°C · 201 mm rain
- Hōfu in JuneJapan · 61 kmHigh 25.6°C · Low 18.8°C · 260 mm rain
- Matsuyama in JuneJapan · 62 kmHigh 26.1°C · Low 19.7°C · 268 mm rain
- Yamaguchi in JuneJapan · 69 kmHigh 25.6°C · Low 17.9°C · 248 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.