10-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Partly cloudy
8°
Feels like 8°
Wind↑ WNW 4 km/h
Humidity 79 %
Afternoon
Clear sky
15°
Feels like 15°
Wind↑ NNW 13 km/h
Humidity 46 %
11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Clear sky
9°
Feels like 8°
Wind↑ NNW 5 km/h
Humidity 68 %
Afternoon
Clear sky
17°
Feels like 17°
Wind↑ S 5 km/h
Humidity 41 %
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Clear sky
10°
Feels like 10°
Wind↑ NE 3 km/h
Humidity 68 %
Afternoon
Clear sky
18°
Feels like 18°
Wind↑ WSW 4 km/h
Humidity 37 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Clear sky
11°
Feels like 11°
Wind↑ NW 5 km/h
Humidity 66 %
Afternoon
Clear sky
19°
Feels like 19°
Wind↑ NNW 12 km/h
Humidity 47 %
Ōtsu forecast in charts · next 7 days
The week ahead: highs and lows
▲ This week runs +1.6° warmer than usual
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Ōtsu climate: what a normal year looks like
The hottest stretch is August, when afternoons average 31 °C; the coldest is January, when nights average 0 °C. Between those two months the average temperature changes by 24 °C.
A normal year brings roughly 1,570 mm of rain — more than 78% of the towns of 20,000+ people we compared it with.
Typical highs of 30 °C or more are reached in August only, at 31 °C.
From 14 h 30 min of daylight in late June to 9 h 48 min in late December.
Forecast highs for the coming week average 17 °C, 4 °C cooler than a normal October (21 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
7 °C
0 °C
71 mm
Feb
9 °C
1 °C
77 mm
Mar
12 °C
4 °C
119 mm
Apr
17 °C
8 °C
130 mm
May
23 °C
14 °C
148 mm
Jun
26 °C
18 °C
201 mm
Jul
30 °C
23 °C
215 mm
Aug
32 °C
23 °C
130 mm
Sep
27 °C
20 °C
179 mm
Oct
21 °C
13 °C
156 mm
Nov
16 °C
8 °C
80 mm
Dec
10 °C
2 °C
68 mm
Whole year
19 °C
11 °C
1,570 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 35.00° N, 135.87° 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 Ōtsu: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.55µg/m³
PM107µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Ōtsu
Rain observed over the last two hours by official weather radars around Ōtsu, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
No open weather radar covers Ōtsu yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Ōtsu
Waning gibbous
79 % illuminated · 19.3 days
Rise 15:16 Set 05:42
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 Ōtsu
Curious about the weather in Ōtsu on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Ōtsu weather at a glance
This page gathers everything about the weather in Ōtsu, Shiga: 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 15 °C (feels like 15 °C) and the wind blows at 4 km/h.
Expected range today: 13 °C to 17 °C and around 9 mm of rain. 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 Ōtsu 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.
