Kutchan weather in September

In September, Kutchan sees average daytime highs of 20°C and overnight lows near 12°C, with 150 mm of rain across 15.4 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 17°C by the end. The sky is clear or mostly clear about 22% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Kutchan's 4th-clearest and 9th-windiest month. For the whole year in context, see Kutchan's year-round climate.

Daytime high
20°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
150 mm
15.4 wet days
Daylight
12 h 18 min
5:23 AM – 5:40 PM
Cloud cover
66%
4th clearest
Wind
7 km/h
9th windiest
Solar energy
3.91 kWh/m²
Travel score
5.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 22°C in the first days to 17°C by the end.

A typical September day in Kutchan reaches about 20°C in the afternoon and slips back to 12°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 23°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12215
22215
32215
42215
52215
62214
72114
82114
92114
102114
112113
122113
132013
142013
152012
162012
172012
181912
191911
201911
211911
221911
231810
241810
251810
261810
27179
28179
29179
30179

How September really feels in Kutchan

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.

Kutchan weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-4° / -10°7316.4229.20.0
Feb-3° / -9°6414.719.410.20.0
Mar / -6°7615.516.611.60.0
Apr / 7412.26.713.11.3
May15° / 9012.70.714.44.1
Jun19° / 11°8011.9015.15.6
Jul22° / 16°12813.9014.85.9
Aug23° / 17°17214.9013.85.9
Sep20° / 12°15015.4012.35.3
Oct13° / 10914.60.910.83.3
Nov / -1°10717.112.69.50.4
Dec-2° / -7°9718.821.68.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% 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 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33565
43565
53565
63565
73565
83664
93664
103664
113664
123664
133763
143763
153862
163862
173862
184060
194060
204060
214060
224159
234159
244159
254060
264060
274159
284060
294060
304060

Chance of precipitation in September

Any precipitation

Kutchan gets around 150 mm of rain over 15.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 51% and peaks near 52% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
150
250
351
451
552
652
752
852
952
1052
1152
1252
1352
1452
1551
1651
1751
1851
1951
2051
2151
2251
2351
2451
2551
2651
2751
2851
2951
3051

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1173232191
2183330181
3203329171
4213427171
5233526161
6253624151
7273623141
8293621131
9323620121
10343618111
11373617101
1240351690
1343341580
1446331370
1549321260
1652311160
1755301050
185928940
196127840
206525730
216724630
226923530
237321420
247420420
257719310
267918210
278017210
288316100
298415100
308613100

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:06 AM to 5:39 AM, and sunset from 6:08 PM to 5:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:066:08
213.05:076:06
312.95:086:04
412.95:096:02
512.85:106:00
612.85:125:58
712.75:135:57
812.75:145:55
912.65:155:53
1012.65:165:51
1112.55:175:49
1212.55:185:47
1312.45:195:46
1412.45:205:44
1512.35:225:42
1612.35:235:40
1712.25:245:38
1812.25:255:36
1912.15:265:34
2012.15:275:32
2112.05:285:31
2212.05:305:29
2311.95:315:27
2411.95:325:25
2511.85:335:23
2611.85:345:21
2711.75:355:19
2811.75:365:18
2911.65:385:16
3011.65:395:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.91 kWh/m².

For context, solar energy here swings from a low near 1.54 kWh/m² to a high of 5.66 kWh/m² in May across the year — September's 3.91 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.2Bright
44.2Bright
54.2Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.0Bright
114.0Bright
124.0Moderate
134.0Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.8Moderate
193.8Moderate
203.8Moderate
213.8Moderate
223.7Moderate
233.7Moderate
243.7Moderate
253.6Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Kutchan

In seasonPeak

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

Kutchan 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 September a good time to visit Kutchan?

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

5.3
Sightseeing
4th-best month of the year
2.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Kutchan for sightseeing.

What to pack for Kutchan in September

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

In September, Kutchan sees daytime highs around 20°C and nights near 12°C. Pack rain gear. About 15 days see rain.

rain gear

Sea temperature near Kutchan in September

The nearest coast averages about 21°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 30 km away) is warmest in August at about 22°C and coldest in February near 6°C.

It's comfortable for a long swim from Jul 29 to Sep 25 — about 1.9 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan8Bracing
Feb6Bracing
Mar6Bracing
Apr8Bracing
May11Bracing
Jun15Bracing
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct17Cool
Nov13Bracing
Dec10Bracing

UV index in Kutchan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Kutchan peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighVery highHighModerateLowAug 18UV 8Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May8Very high
Jun7High
Jul5Moderate
Aug9Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Kutchan 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 Kutchan is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1219 µg/m³Dec 158 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun12Moderate
Jul11Good
Aug10Good
Sep9Good
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Kutchan?

Kutchan sits at 42.9°N, 140.7°E, 185 m above sea level, in Japan. The nearest listed city is Niseko, 11 km away.

Topography around Kutchan

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

Within 3 km, the terrain around Kutchan has only modest variations in elevation — a maximum elevation change of 199 m around an average of 214 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,876 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,867 m.

The land around Kutchan is covered by trees (49%) and cropland (30%) within 3 km, trees (80%) within 16 km, and water (48%) and trees (42%) within 80 km.

3 km
199 m
16 km
1,876 m
80 km
1,867 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Niseko 11 km · Yoichi 34 km · Otaru 38 km · Date 49 km · Sapporo 53 km · Noboribetsu 61 km · Ishikari 62 km · Shiraoi 63 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 Kutchan (42.9011°, 140.7406°, elevation 185 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. 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).