Climate averages 1991–2020
Yachiyo weather
in August.
A hot, wet month: the warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Yachiyo: daytime highs average 29.6°C and nights cool to about 23.5°C. By daytime temperature it is the warmest month of the year.
Expect about 112 mm of rain on roughly 12 days, which makes August a wet month (the 5th 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 Narashino (10 km away). In August its highs average 29.7°C, about as warm as Yachiyo, with 112 mm of rain.
Among the 303 cities listed in Japan, Yachiyo ranks joint 147th of 303 for the warmest August highs and joint 44th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Yachiyo is 0.5°C warmer than that mean.
From August to September, average highs fall by 3.6°C to 26.0°C, and monthly rainfall rises from 112 mm to 175 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
Yachiyo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.3°C1.0°C | 1.0°C | 69 | 6.8 | 10.010 h |
| February | 9.1°C1.4°C | 1.4°C | 66 | 8.0 | 10.911 h |
| March | 12.4°C4.5°C | 4.5°C | 120 | 12.2 | 11.912 h |
| April | 17.2°C9.3°C | 9.3°C | 114 | 11.9 | 13.113 h |
| May | 21.6°C14.3°C | 14.3°C | 131 | 11.6 | 14.014 h |
| June | 24.5°C18.1°C | 18.1°C | 161 | 13.7 | 14.515 h |
| July | 28.2°C22.1°C | 22.1°C | 153 | 13.7 | 14.314 h |
| August, selected | 29.6°C23.5°C | 23.5°C | 112 | 11.8 | 13.514 h |
| September | 26.0°C20.5°C | 20.5°C | 175 | 14.2 | 12.412 h |
| October | 20.7°C15.0°C | 15.0°C | 207 | 12.9 | 11.311 h |
| November | 15.7°C9.3°C | 9.3°C | 98 | 10.1 | 10.310 h |
| December | 10.7°C3.8°C | 3.8°C | 63 | 7.7 | 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
- Narashino in AugustJapan · 10 kmHigh 29.7°C · Low 23.6°C · 112 mm rain
- Sakura in AugustJapan · 10 kmHigh 29.8°C · Low 23.6°C · 114 mm rain
- Inzai in AugustJapan · 12 kmHigh 30.0°C · Low 23.3°C · 114 mm rain
- Kamagaya in AugustJapan · 12 kmHigh 29.8°C · Low 23.3°C · 112 mm rain
- Chiba in AugustJapan · 15 kmHigh 29.6°C · Low 23.8°C · 118 mm rain
- Narita in AugustJapan · 18 kmHigh 30.2°C · Low 23.3°C · 114 mm rain
- Toride in AugustJapan · 19 kmHigh 30.0°C · Low 23.3°C · 123 mm rain
- Ryūgasaki in AugustJapan · 19 kmHigh 30.0°C · Low 23.3°C · 119 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 Yachiyo) is explained once on the Yachiyo year overview and on the Sources, method and limits page.
Matsudo, Kashiwa and Nagareyama lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.