10-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Mainly clear
15°
Feels like 15°
Wind↑ NW 5 km/h
Humidity 55 %
Evening
Partly cloudy
15°
Feels like 15°
Wind↑ NW 5 km/h
Humidity 49 %
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
15°
Feels like 15°
Wind↑ NNE 7 km/h
Humidity 44 %
Evening
Clear sky
15°
Feels like 15°
Wind↑ NE 7 km/h
Humidity 56 %
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
15°
Feels like 15°
Wind↑ NE 5 km/h
Humidity 51 %
Evening
Clear sky
15°
Feels like 15°
Wind↑ NE 7 km/h
Humidity 64 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Mainly clear
16°
Feels like 16°
Wind↑ NNE 6 km/h
Humidity 55 %
Evening
Partly cloudy
16°
Feels like 16°
Wind↑ NNE 6 km/h
Humidity 56 %
Hamamatsu 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)
Hamamatsu climate: what a normal year looks like
A normal year brings roughly 2,040 mm of rain — more than 89% of the towns of 20,000+ people we compared it with.
The hottest stretch is August, when afternoons average 31 °C; the coldest is January, when nights average 3 °C. Between those two months the average temperature changes by 22 °C.
Afternoons reach 30 °C or more in July and August; the typical peak is 31 °C in August.
From 14 h 29 min of daylight in late June to 9 h 49 min in late December.
Forecast highs for the coming week average 20 °C, 3 °C cooler than a normal October (23 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
10 °C
3 °C
72 mm
Feb
11 °C
4 °C
95 mm
Mar
14 °C
6 °C
148 mm
Apr
19 °C
11 °C
167 mm
May
23 °C
16 °C
188 mm
Jun
26 °C
20 °C
266 mm
Jul
30 °C
24 °C
273 mm
Aug
31 °C
25 °C
166 mm
Sep
28 °C
22 °C
256 mm
Oct
23 °C
16 °C
217 mm
Nov
18 °C
11 °C
121 mm
Dec
13 °C
5 °C
72 mm
Whole year
20 °C
13 °C
2,040 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 34.70° N, 137.73° 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 Hamamatsu: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.54µg/m³
PM106µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Hamamatsu
Rain observed over the last two hours by official weather radars around Hamamatsu, 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 Hamamatsu yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Hamamatsu
Waning gibbous
79 % illuminated · 19.3 days
Rise 15:10 Set 05:33
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 Hamamatsu
Curious about the weather in Hamamatsu on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Hamamatsu weather at a glance
This page gathers everything about the weather in Hamamatsu, Shizuoka: 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 17 °C (feels like 17 °C) and the wind blows at 10 km/h.
Expected range today: 16 °C to 22 °C and around 4 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 Hamamatsu 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.
