Climate averages 1991–2020
Yachiyo weather
in October.
A mild, very wet month: the 6th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Yachiyo: daytime highs average 20.7°C and nights cool to about 15.0°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 207 mm of rain on roughly 13 days, which makes October a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 19 min on an average October day.
The nearest other city in this atlas is Narashino (10 km away). In October its highs average 20.8°C, about as warm as Yachiyo, with 207 mm of rain.
Among the 303 cities listed in Japan, Yachiyo ranks joint 158th of 303 for the warmest October highs and joint 228th of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Yachiyo is 0.4°C warmer than that mean.
From October to November, average highs fall by 5.1°C to 15.7°C, and monthly rainfall falls from 207 mm to 98 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
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 | 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, selected | 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
October in nearby cities
- Narashino in OctoberJapan · 10 kmHigh 20.8°C · Low 14.9°C · 207 mm rain
- Sakura in OctoberJapan · 10 kmHigh 20.9°C · Low 15.2°C · 207 mm rain
- Inzai in OctoberJapan · 12 kmHigh 20.8°C · Low 14.6°C · 207 mm rain
- Kamagaya in OctoberJapan · 12 kmHigh 20.8°C · Low 14.3°C · 207 mm rain
- Chiba in OctoberJapan · 15 kmHigh 21.0°C · Low 15.5°C · 251 mm rain
- Narita in OctoberJapan · 18 kmHigh 20.9°C · Low 14.6°C · 207 mm rain
- Toride in OctoberJapan · 19 kmHigh 20.9°C · Low 14.2°C · 186 mm rain
- Ryūgasaki in OctoberJapan · 19 kmHigh 20.9°C · Low 14.3°C · 191 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.