Hamamatsu weather in October

In October, Hamamatsu sees average daytime highs of 23°C and overnight lows near 16°C, with 216 mm of rain across 12.5 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 21°C by the end. The sky is clear or mostly clear about 38% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Hamamatsu's 6th-clearest and 8th-windiest month. For the whole year in context, see Hamamatsu's year-round climate.

Daytime high
23°
6th warmest
Overnight low
16°
8th coldest
Rainfall
216 mm
12.5 wet days
Daylight
11 h 06 min
6:01 AM – 5:07 PM
Cloud cover
56%
6th clearest
Wind
11 km/h
8th windiest
Solar energy
3.3 kWh/m²
Travel score
6.4
out of 10
Air quality
Good
PM2.5 9 µg/m³ · 2010

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 25°C in the first days to 21°C by the end.

A typical October day in Hamamatsu reaches about 23°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°C. Set against its neighbours, October runs about 5°C cooler than September and about 5°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12519
22519
32519
42518
52518
62518
72418
82418
92418
102417
112417
122417
132317
142317
152316
162316
172316
182316
192215
202215
212215
222215
232215
242114
252114
262114
272114
282114
292113
302013
312013

How October really feels in Hamamatsu

Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Hamamatsu weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 705.90.19.92.7
Feb11° / 896.90.510.73.1
Mar14° / 14810.80.111.74.3
Apr19° / 10°16511.1012.85.9
May23° / 15°18412013.86.4
Jun26° / 20°25815.7014.35.4
Jul30° / 24°27316.9014.14.2
Aug31° / 25°15716.2013.33.8
Sep28° / 22°24715.8012.25.1
Oct23° / 16°21612.5011.16.4
Nov18° / 10°1229.2010.25.9
Dec13° / 716.609.73.9

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 13% of October, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24357
34456
44456
54456
64555
74654
84654
94753
104753
114852
124951
134951
145050
155149
165149
175248
185248
195347
205347
215347
225446
235446
245545
255545
265644
275743
285743
295842
305941
316040

Chance of precipitation in October

Any precipitation

Hamamatsu gets around 216 mm of rain over 12.5 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 40% and peaks near 50% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
150
249
348
448
547
646
746
845
944
1043
1143
1242
1341
1441
1540
1639
1739
1838
1938
2037
2137
2237
2336
2436
2535
2635
2734
2834
2933
3033
3133

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, October lands in the dry band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1112135285
2122236264
3132336254
4142336233
5152536223
6162636203
7172735192
8182834172
9202933162
10213032142
11233131132
12253229122
13273328111
1430342691
1532342481
1634342381
1736352171
1839352061
1942351851
2044341741
2147341540
2250331430
2352321330
2456311120
2558301020
2659291020
276327910
286526810
296725710
306824710
317122610

Wind in October

Winds average 11 km/h in October.

Across October, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 42 min at the start of October to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 5:48 AM to 6:14 AM, and sunset from 5:28 PM to 4:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:485:28
211.65:495:26
311.65:505:25
411.55:515:23
511.55:525:22
611.55:525:21
711.45:535:19
811.45:545:18
911.45:555:17
1011.35:565:15
1111.35:565:14
1211.35:575:13
1311.25:585:11
1411.25:595:10
1511.16:005:09
1611.16:015:07
1711.16:025:06
1811.06:025:05
1911.06:035:04
2011.06:045:03
2110.96:055:01
2210.96:065:00
2310.96:074:59
2410.86:084:58
2510.86:094:57
2610.86:104:56
2710.76:114:55
2810.76:124:54
2910.76:124:53
3010.66:134:52
3110.66:144:51

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.3 kWh/m².

For context, solar energy here swings from a low near 2.63 kWh/m² to a high of 5.38 kWh/m² in May across the year — October's 3.3 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.5Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.4Moderate
83.4Moderate
93.4Moderate
103.4Moderate
113.4Moderate
123.4Moderate
133.3Moderate
143.3Moderate
153.3Moderate
163.3Moderate
173.3Moderate
183.3Moderate
193.3Moderate
203.2Moderate
213.2Moderate
223.2Moderate
233.2Moderate
243.2Moderate
253.2Moderate
263.1Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.1Moderate
313.1Moderate
Planning a trip in October

Hazard calendar for Hamamatsu

In seasonPeak

In October, Hamamatsu sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Hamamatsu sits in the Pacific typhoon belt; the season peaks July–October.

Pacific typhoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Hamamatsu?

Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.4
Sightseeing
1st-best month of the year
4.8
Beach & pool
6th-best month of the year

October is a reasonable time to visit Hamamatsu for sightseeing.

What to pack for Hamamatsu in October

From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In October, Hamamatsu sees daytime highs around 23°C and nights near 16°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Hamamatsu in October

The nearest coast averages about 23°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 km away) is warmest in August at about 27°C and coldest in February near 16°C.

It's comfortable for a long swim from May 25 to Nov 28 — about 6.2 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb16Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec19Cool

UV index in Hamamatsu in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hamamatsu peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 15UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Hamamatsu?

Hamamatsu sits at 34.7°N, 137.7°E, 3 m above sea level, in Japan. The nearest listed city is Iwata, 11 km away.

Topography around Hamamatsu

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hamamatsu.

Within 3 km, the terrain around Hamamatsu has only modest variations in elevation — a maximum elevation change of 41 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 274 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,569 m.

The land around Hamamatsu is covered by artificial surfaces (87%) within 3 km, water (42%) and artificial surfaces (31%) within 16 km, and trees (44%) and water (43%) within 80 km.

3 km
41 m
16 km
274 m
80 km
2,569 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Iwata 11 km · Hamakita 12 km · Arai 15 km · Fukuroi 18 km · Kosai 19 km · Mori 24 km · Kakegawa 27 km · Shinshiro 31 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hamamatsu (34.7°, 137.7333°, elevation 3 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).