Climate averages 1991–2020
Hachiōji weather
in January.
A cold, moderately wet month: the coolest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Hachiōji: daytime highs average 7.8°C and nights cool to about -2.2°C. By daytime temperature it is the coolest month of the year.
Expect about 77 mm of rain on roughly 9 days, which makes January a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 02 min on an average January day.
The nearest other city in this atlas is Aihara (6 km away). In January its highs average 7.7°C, about as warm as Hachiōji, with 82 mm of rain.
Among the 303 cities listed in Japan, Hachiōji ranks joint 151st of 303 for the warmest January highs and joint 212th of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Hachiōji is 0.8°C warmer than that mean.
From January to February, average highs rise by 0.8°C to 8.5°C, and monthly rainfall falls from 77 mm to 76 mm.
The annual picture
January 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
Hachiōji climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 7.8°C-2.2°C | -2.2°C | 77 | 8.5 | 10.010 h |
| February | 8.5°C-1.6°C | -1.6°C | 76 | 9.7 | 10.911 h |
| March | 12.0°C1.9°C | 1.9°C | 139 | 15.2 | 11.912 h |
| April | 17.0°C7.1°C | 7.1°C | 146 | 14.6 | 13.113 h |
| May | 21.2°C12.4°C | 12.4°C | 166 | 15.6 | 14.014 h |
| June | 23.8°C16.8°C | 16.8°C | 222 | 19.5 | 14.515 h |
| July | 27.5°C21.0°C | 21.0°C | 243 | 21.8 | 14.314 h |
| August | 28.6°C22.2°C | 22.2°C | 205 | 21.0 | 13.514 h |
| September | 25.0°C18.7°C | 18.7°C | 249 | 18.2 | 12.412 h |
| October | 19.8°C12.8°C | 12.8°C | 242 | 16.2 | 11.311 h |
| November | 15.0°C6.6°C | 6.6°C | 101 | 11.3 | 10.310 h |
| December | 10.3°C0.9°C | 0.9°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
January in nearby cities
- Aihara in JanuaryJapan · 6 kmHigh 7.7°C · Low -1.8°C · 82 mm rain
- Hino in JanuaryJapan · 7 kmHigh 7.7°C · Low -2.0°C · 69 mm rain
- Akiruno in JanuaryJapan · 12 kmHigh 7.8°C · Low -1.6°C · 77 mm rain
- Sagamihara in JanuaryJapan · 12 kmHigh 7.4°C · Low -1.7°C · 82 mm rain
- Tama in JanuaryJapan · 13 kmHigh 7.5°C · Low -1.1°C · 69 mm rain
- Fuchū in JanuaryJapan · 14 kmHigh 7.7°C · Low -1.4°C · 69 mm rain
- Ōme in JanuaryJapan · 16 kmHigh 7.4°C · Low -2.0°C · 77 mm rain
- Machida in JanuaryJapan · 17 kmHigh 7.7°C · Low 0.2°C · 74 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 Hachiōji) is explained once on the Hachiōji year overview and on the Sources, method and limits page.
Iruma, Ōme and Akiruno lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.