Climate averages 1991–2020
Iwakuni weather
in October.
A mild, wet month: the 6th warmest and the joint 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Iwakuni: daytime highs average 21.5°C and nights cool to about 15.5°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 116 mm of rain on roughly 8 days, which makes October a wet month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 21 min on an average October day.
The nearest other city in this atlas is Hatsukaichi (23 km away). In October its highs average 22.0°C, about as warm as Iwakuni, with 116 mm of rain.
Among the 303 cities listed in Japan, Iwakuni ranks joint 69th of 303 for the warmest October highs and joint 54th of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Iwakuni is 1.2°C warmer than that mean.
From October to November, average highs fall by 5.4°C to 16.1°C, and monthly rainfall falls from 116 mm to 72 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Hatsukaichi in OctoberJapan · 23 kmHigh 22.0°C · Low 14.5°C · 116 mm rain
- Kure in OctoberJapan · 33 kmHigh 20.8°C · Low 16.0°C · 113 mm rain
- Hiroshima in OctoberJapan · 34 kmHigh 21.5°C · Low 13.7°C · 109 mm rain
- Shūnan in OctoberJapan · 37 kmHigh 20.1°C · Low 13.4°C · 113 mm rain
- Higashihiroshima in OctoberJapan · 55 kmHigh 20.8°C · Low 13.2°C · 102 mm rain
- Hōfu in OctoberJapan · 61 kmHigh 22.1°C · Low 15.0°C · 102 mm rain
- Matsuyama in OctoberJapan · 62 kmHigh 22.1°C · Low 16.0°C · 141 mm rain
- Yamaguchi in OctoberJapan · 69 kmHigh 21.6°C · Low 13.7°C · 97 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.