Climate averages 1991–2020
Yamaguchi weather
in August.
A hot, wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Yamaguchi: daytime highs average 30.2°C and nights cool to about 23.4°C. By daytime temperature it is the warmest month of the year.
Expect about 167 mm of rain on roughly 14 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 26 min on an average August day.
The nearest other city in this atlas is Hōfu (17 km away). In August its highs average 30.3°C, about as warm as Yamaguchi, with 135 mm of rain.
Among the 303 cities listed in Japan, Yamaguchi ranks joint 78th of 303 for the warmest August highs and joint 210th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Yamaguchi is 1.0°C warmer than that mean.
From August to September, average highs fall by 3.5°C to 26.7°C, and monthly rainfall rises from 167 mm to 178 mm.
The annual picture
August 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
Yamaguchi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.7°C1.5°C | 1.5°C | 61 | 9.7 | 10.210 h |
| February | 9.0°C1.6°C | 1.6°C | 72 | 10.0 | 10.911 h |
| March | 12.7°C4.0°C | 4.0°C | 117 | 11.4 | 11.912 h |
| April | 17.9°C8.4°C | 8.4°C | 130 | 10.6 | 13.013 h |
| May | 22.4°C13.2°C | 13.2°C | 150 | 10.5 | 13.914 h |
| June | 25.6°C17.9°C | 17.9°C | 248 | 14.3 | 14.414 h |
| July | 28.8°C22.3°C | 22.3°C | 283 | 16.3 | 14.214 h |
| August, selected | 30.2°C23.4°C | 23.4°C | 167 | 14.2 | 13.413 h |
| September | 26.7°C19.6°C | 19.6°C | 178 | 12.4 | 12.412 h |
| October | 21.6°C13.7°C | 13.7°C | 97 | 8.1 | 11.411 h |
| November | 15.7°C8.3°C | 8.3°C | 78 | 8.2 | 10.410 h |
| December | 10.0°C3.6°C | 3.6°C | 64 | 9.7 | 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
August in nearby cities
- Hōfu in AugustJapan · 17 kmHigh 30.3°C · Low 24.3°C · 135 mm rain
- Ube in AugustJapan · 33 kmHigh 29.7°C · Low 24.7°C · 141 mm rain
- Shūnan in AugustJapan · 35 kmHigh 28.3°C · Low 22.6°C · 147 mm rain
- Yukuhashi in AugustJapan · 67 kmHigh 30.5°C · Low 24.3°C · 132 mm rain
- Kitakyushu in AugustJapan · 68 kmHigh 29.9°C · Low 24.6°C · 142 mm rain
- Iwakuni in AugustJapan · 69 kmHigh 29.8°C · Low 24.4°C · 169 mm rain
- Nakatsu in AugustJapan · 70 kmHigh 30.9°C · Low 24.6°C · 144 mm rain
- Hatsukaichi in AugustJapan · 82 kmHigh 30.9°C · Low 24.3°C · 169 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 Yamaguchi) is explained once on the Yamaguchi year overview and on the Sources, method and limits page.