10-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Clear sky
12°
Feels like 12°
Wind↑ N 1 km/h
Humidity 54 %
Evening
Clear sky
10°
Feels like 10°
Wind↑ W 7 km/h
Humidity 68 %
11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Partly cloudy
12°
Feels like 12°
Wind↑ NNE 5 km/h
Humidity 52 %
Evening
Clear sky
11°
Feels like 11°
Wind↑ NW 5 km/h
Humidity 67 %
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Clear sky
13°
Feels like 13°
Wind↑ NE 4 km/h
Humidity 67 %
Evening
Clear sky
11°
Feels like 11°
Wind↑ W 7 km/h
Humidity 68 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Clear sky
14°
Feels like 14°
Wind↑ SE 2 km/h
Humidity 59 %
Evening
Partly cloudy
12°
Feels like 12°
Wind↑ W 8 km/h
Humidity 67 %
Hachiōji forecast in charts · next 7 days
The week ahead: highs and lows
≈ A week close to the usual temperatures
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Hachiōji climate: what a normal year looks like
The hottest stretch is August, when afternoons average 29 °C; the coldest is January, when nights average −1 °C. Between those two months the average temperature changes by 23 °C.
A normal year brings roughly 1,870 mm of rain — more than 86% of the towns of 20,000+ people we compared it with.
Freezing nights are typical in January only (−1 °C on average).
From 14 h 34 min of daylight in late June to 9 h 44 min in late December.
Forecast highs for the coming week average 17 °C, 3 °C cooler than a normal October (20 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
7 °C
−1 °C
81 mm
Feb
9 °C
0 °C
84 mm
Mar
11 °C
3 °C
140 mm
Apr
17 °C
9 °C
145 mm
May
21 °C
14 °C
162 mm
Jun
24 °C
18 °C
212 mm
Jul
28 °C
22 °C
217 mm
Aug
29 °C
23 °C
182 mm
Sep
25 °C
20 °C
240 mm
Oct
20 °C
14 °C
233 mm
Nov
15 °C
7 °C
104 mm
Dec
11 °C
2 °C
71 mm
Whole year
18 °C
11 °C
1,870 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 35.66° N, 139.32° E, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.
Air you breathe in Hachiōji: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.58µg/m³
PM108µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Hachiōji
Rain observed over the last two hours by official weather radars around Hachiōji, followed by the radar forecast for the next hour where the weather service provides one.
Rain radarLast two hours, then forecast where available · drag the timeline
No open weather radar covers Hachiōji yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Hachiōji
Waning gibbous
79 % illuminated · 19.3 days
Rise 15:00 Set 05:30
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Wed11/113%
Moonrise and moonset in local time (Asia/Tokyo); phase and lit fraction from a synodic calculation.
Look up a past day in Hachiōji
Curious about the weather in Hachiōji on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Hachiōji weather at a glance
This page gathers everything about the weather in Hachiōji, Tokyo: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “partly cloudy”, it is 10 °C (feels like 10 °C) and the wind blows at 4 km/h.
Expected range today: 12 °C to 17 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.
Use the Hachiōji forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
