Climate averages 1991–2020
Akiruno weather
in August.
A hot, very wet month: the warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Akiruno: daytime highs average 28.9°C and nights cool to about 22.4°C. By daytime temperature it is the warmest month of the year.
Expect about 205 mm of rain on roughly 21 days, which makes August a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 31 min on an average August day.
The nearest other city in this atlas is Ōme (6 km away). In August its highs average 29.0°C, about as warm as Akiruno, with 205 mm of rain.
Among the 303 cities listed in Japan, Akiruno ranks joint 204th of 303 for the warmest August highs and joint 288th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Akiruno is 0.3°C cooler than that mean.
From August to September, average highs fall by 3.6°C to 25.3°C, and monthly rainfall rises from 205 mm to 249 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
Akiruno climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.8°C-1.6°C | -1.6°C | 77 | 8.5 | 10.010 h |
| February | 8.5°C-1.2°C | -1.2°C | 76 | 9.7 | 10.911 h |
| March | 12.1°C2.2°C | 2.2°C | 139 | 15.2 | 11.912 h |
| April | 17.3°C7.5°C | 7.5°C | 146 | 14.6 | 13.113 h |
| May | 21.6°C12.8°C | 12.8°C | 166 | 15.6 | 14.014 h |
| June | 24.1°C17.1°C | 17.1°C | 222 | 19.5 | 14.515 h |
| July | 27.9°C21.3°C | 21.3°C | 243 | 21.8 | 14.314 h |
| August, selected | 28.9°C22.4°C | 22.4°C | 205 | 21.0 | 13.514 h |
| September | 25.3°C19.0°C | 19.0°C | 249 | 18.2 | 12.412 h |
| October | 20.0°C13.2°C | 13.2°C | 242 | 16.2 | 11.311 h |
| November | 15.2°C7.1°C | 7.1°C | 101 | 11.3 | 10.310 h |
| December | 10.4°C1.7°C | 1.7°C | 68 | 8.3 | 9.810 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
- Ōme in AugustJapan · 6 kmHigh 29.0°C · Low 22.5°C · 205 mm rain
- Hachiōji in AugustJapan · 12 kmHigh 28.6°C · Low 22.2°C · 205 mm rain
- Hannō in AugustJapan · 16 kmHigh 29.3°C · Low 22.7°C · 205 mm rain
- Iruma in AugustJapan · 16 kmHigh 28.7°C · Low 22.2°C · 205 mm rain
- Aihara in AugustJapan · 16 kmHigh 28.4°C · Low 22.2°C · 160 mm rain
- Hino in AugustJapan · 16 kmHigh 28.7°C · Low 22.4°C · 142 mm rain
- Sagamihara in AugustJapan · 18 kmHigh 28.5°C · Low 22.2°C · 160 mm rain
- Sayama in AugustJapan · 21 kmHigh 29.1°C · Low 22.3°C · 142 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 Akiruno) is explained once on the Akiruno year overview and on the Sources, method and limits page.
Hachiōji, Iruma and Ōme lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.