Minami-Alps weather in September

In September, Minami-Alps sees average daytime highs of 22°C and overnight lows near 15°C, with 270 mm of rain across 18.2 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 16% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Minami-Alps's 10th-clearest and 10th-windiest month. For the whole year in context, see Minami-Alps's year-round climate.

Daytime high
22°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
270 mm
18.2 wet days
Daylight
12 h 12 min
5:34 AM – 5:47 PM
Cloud cover
71%
10th clearest
Wind
5 km/h
10th windiest
Solar energy
3.83 kWh/m²
Travel score
5.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 20°C by the end.

A typical September day in Minami-Alps reaches about 22°C in the afternoon and slips back to 15°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12518
22517
32417
42417
52417
62417
72417
82417
92417
102316
112316
122316
132316
142316
152315
162215
172215
182215
192215
202214
212114
222114
232114
242114
252113
262113
272013
282013
292013
302013

How September really feels in Minami-Alps

Once humidity and wind are folded in, September 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

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

Minami-Alps weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°807.76.89.90.0
Feb / -6°939.16.810.70.0
Mar / -2°166147.211.71.3
Apr14° / 16814.11.712.93.6
May18° / 17514.8013.95.2
Jun21° / 14°24318.9014.44.8
Jul25° / 18°26921.3014.24.9
Aug26° / 19°19220.9013.35.0
Sep22° / 15°27018.2012.25.2
Oct17° / 24615.6011.14.8
Nov12° / 12110.90.310.13.1
Dec / -2°808.33.59.60.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33565
43466
53466
63466
73466
83466
93367
103367
113367
123268
133367
143268
153169
163169
173268
183169
193169
203268
213268
223070
233169
243169
253169
263268
273268
283268
293268
303367

Chance of precipitation in September

Any precipitation

Minami-Alps gets around 270 mm of rain over 18.2 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 61% and peaks near 64% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
164
264
364
464
564
663
763
862
962
1062
1161
1261
1360
1460
1560
1660
1760
1860
1960
2060
2160
2260
2360
2460
2560
2660
2760
2860
2960
3060

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12165329
22175427
32175526
43185425
54195423
65205322
75215420
86225319
98235217
109245116
1110265015
1211274813
1313284712
1415294511
1517304310
161931419
172132398
182333377
192534346
202835325
213035305
223336274
233536254
243836233
254036213
264336192
274536172
284835162
295035141
305234131

Wind in September

Winds average 5 km/h in September.

Across September, 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.

0246810151015202530
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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:22 AM to 5:45 AM, and sunset from 6:10 PM to 5:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:226:10
212.85:236:08
312.75:246:07
412.75:256:05
512.65:256:04
612.65:266:02
712.65:276:01
812.55:285:59
912.55:285:58
1012.55:295:56
1112.45:305:55
1212.45:315:53
1312.35:315:52
1412.35:325:50
1512.35:335:49
1612.25:345:47
1712.25:355:46
1812.15:355:44
1912.15:365:43
2012.15:375:41
2112.05:385:39
2212.05:395:38
2312.05:395:36
2411.95:405:35
2511.95:415:33
2611.85:425:32
2711.85:435:30
2811.85:435:29
2911.75:445:27
3011.75:455:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.83 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 5.39 kWh/m² in May across the year — September's 3.83 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.2Bright
54.2Bright
64.1Bright
74.1Bright
84.1Bright
94.0Bright
104.0Bright
114.0Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.8Moderate
163.8Moderate
173.8Moderate
183.7Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.6Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Is September a good time to visit Minami-Alps?

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

5.2
Sightseeing
1st-best month of the year
3.8
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Minami-Alps for sightseeing.

What to pack for Minami-Alps in September

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

In September, Minami-Alps sees daytime highs around 22°C and nights near 15°C. Pack rain gear. Worth having: light clothes. About 18 days see rain.

rain gearlight clothes

Sea temperature near Minami-Alps in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 57 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 Minami-Alps in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Minami-Alps peaks around July 14 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 14UV 11Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Minami-Alps in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Minami-Alps is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1623 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb20Moderate
Mar20Moderate
Apr23Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Minami-Alps?

Minami-Alps sits at 35.6°N, 138.5°E, 298 m above sea level, in Japan. The nearest listed city is Minamiarupusu, 1.0 km away.

Topography around Minami-Alps

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

Within 3 km, the terrain around Minami-Alps has significant variations in elevation — a maximum elevation change of 442 m around an average of 329 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,479 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,735 m.

The land around Minami-Alps is covered by artificial surfaces (47%) and cropland (23%) within 3 km, trees (66%) within 16 km, and trees (84%) within 80 km.

3 km
442 m
16 km
2,479 m
80 km
3,735 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Minamiarupusu 1.0 km · Chūō 4.0 km · Ryūō 5.0 km · Shōwa 7.0 km · Kai 9.0 km · Nirasaki 9.0 km · Kofu 11 km · Isawa 16 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 Minami-Alps (35.616°, 138.4634°, elevation 298 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).