Kōshū weather in October

In October, Kōshū sees average daytime highs of 16°C and overnight lows near 9°C, with 212 mm of rain across 15.5 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 14°C by the end. The sky is clear or mostly clear about 28% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Kōshū's 7th-clearest and 8th-windiest month. For the whole year in context, see Kōshū's year-round climate.

Daytime high
16°
6th warmest
Overnight low
7th coldest
Rainfall
212 mm
15.5 wet days
Daylight
11 h 06 min
5:58 AM – 5:02 PM
Cloud cover
64%
7th clearest
Wind
5 km/h
8th windiest
Solar energy
3.09 kWh/m²
Travel score
4.5
out of 10

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 19°C in the first days to 14°C by the end.

A typical October day in Kōshū reaches about 16°C in the afternoon and slips back to 9°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°C. Set against its neighbours, October runs about 5°C cooler than September and about 5°C warmer than November.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11912
21912
31912
41911
51811
61811
71811
81811
91810
101810
111710
121710
131710
14179
15179
16169
17169
18168
19168
20168
21168
22157
23157
24157
25157
26157
27156
28146
29146
30146
31146

How October really feels in Kōshū

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.

Kōshū weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°6676.59.90.0
Feb / -6°718.46.610.60.0
Mar / -2°12913.57.911.71.0
Apr13° / 13113.92.212.93.5
May18° / 14715.10.213.95.1
Jun21° / 14°20519.8014.44.6
Jul25° / 18°23421.9014.24.8
Aug26° / 18°18921.7013.44.9
Sep22° / 15°22018.6012.25.1
Oct16° / 21215.5011.14.5
Nov11° / 8810.10.510.12.8
Dec / -3°607.64.19.60.4

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 14% of October, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23268
33268
43367
53367
63466
73466
83466
93565
103565
113664
123763
133763
143862
153961
164060
174258
184456
194456
204555
214654
224852
234951
245050
255248
265347
275446
285545
295644
305743
315842

Chance of precipitation in October

Any precipitation

Kōshū gets around 212 mm of rain over 15.5 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 49% and peaks near 59% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
159
258
358
457
556
656
755
854
954
1053
1152
1252
1351
1450
1550
1649
1748
1848
1948
2047
2147
2246
2345
2445
2544
2643
2742
2840
2939
3038
3137

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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
162317
264306
366295
469274
570264
672253
774233
875223
978202
1080182
1181172
1283152
1385141
1487121
1588111
1689101
179091
189181
199361
209460
219550
229640
239730
249730
259820
269820
279910
289910
299910
309910
319910

Wind in October

Winds average 5 km/h in October.

Across October, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 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 60 minutes over October. Sunrise moves from 5:45 AM to 6:12 AM, and sunset from 5:23 PM to 4:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:455:23
211.65:455:22
311.65:465:20
411.55:475:19
511.55:485:17
611.55:495:16
711.45:505:15
811.45:515:13
911.35:515:12
1011.35:525:10
1111.35:535:09
1211.25:545:08
1311.25:555:06
1411.25:565:05
1511.15:575:04
1611.15:585:02
1711.05:595:01
1811.05:595:00
1911.06:004:58
2010.96:014:57
2110.96:024:56
2210.96:034:55
2310.86:044:54
2410.86:054:53
2510.86:064:51
2610.76:074:50
2710.76:084:49
2810.76:094:48
2910.66:104:47
3010.66:114:46
3110.66:124:45

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.09 kWh/m².

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5.33 kWh/m² in May across the year — October's 3.09 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.3Moderate
23.3Moderate
33.3Moderate
43.2Moderate
53.2Moderate
63.2Moderate
73.2Moderate
83.2Moderate
93.2Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.1Moderate
153.1Moderate
163.1Moderate
173.1Moderate
183.1Moderate
193.1Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.0Moderate
Planning a trip in October

Is October a good time to visit Kōshū?

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

4.5
Sightseeing
6th-best month of the year
0.9
Beach & pool
6th-best month of the year

October is a reasonable time to visit Kōshū for sightseeing.

What to pack for Kōshū in October

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

In October, Kōshū sees daytime highs around 16°C and nights near 9°C. Pack rain gear. Worth having: a warm layer. About 16 days see rain.

rain geara warm layer

Sea temperature near Kōshū 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 68 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from May 30 to Nov 23 — about 5.9 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar15Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul24Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Kōshū 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 Kōshū peaks around July 16 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 16UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Very high
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Kōshū in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Kōshū is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug14Moderate
Sep13Moderate
Oct12Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Kōshū?

Kōshū sits at 35.7°N, 138.8°E, 635 m above sea level, in Japan. The nearest listed city is Enzan, 4.0 km away.

Topography around Kōshū

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

Within 3 km, the terrain around Kōshū has large variations in elevation — a maximum elevation change of 817 m around an average of 795 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,980 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,735 m.

The land around Kōshū is covered by trees (79%) within 3 km, trees (86%) within 16 km, and trees (70%) within 80 km.

3 km
817 m
16 km
1,980 m
80 km
3,735 m
treesgrasslandcroplandartificial surfaceswater
October weather nearby: Enzan 4.0 km · Yamanashi 9.0 km · Isawa 15 km · Fuefuki 16 km · Kofu 20 km · Ōtsuki 22 km · Tsuru 23 km · Shōwa 24 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 Kōshū (35.7242°, 138.7711°, elevation 635 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. 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).