Mombetsu weather in September

In September, Mombetsu sees average daytime highs of 20°C and overnight lows near 12°C, with 121 mm of rain across 12.3 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 18°C by the end. The sky is clear or mostly clear about 25% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Mombetsu's 5th-clearest and 9th-windiest month. For the whole year in context, see Mombetsu's year-round climate.

Daytime high
20°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
121 mm
12.3 wet days
Daylight
12 h 18 min
5:12 AM – 5:30 PM
Cloud cover
65%
5th clearest
Wind
10 km/h
9th windiest
Solar energy
3.81 kWh/m²
Travel score
5.8
out of 10

Mombetsu is city in Hokkaido, Japan.

Density
28/km²
people per km²
Founded
1954

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

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 18°C by the end.

A typical September day in Mombetsu 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 24°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12215
22214
32214
42214
52214
62214
72214
82214
92113
102113
112113
122113
132113
142112
152012
162012
172012
182011
192011
201911
211911
221910
231910
241910
251810
261810
27189
28189
29189
30179

How September really feels in Mombetsu

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.

Mombetsu 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° / -11°6410.312.290.0
Feb-3° / -11°499.211.710.20.0
Mar / -6°6111.611.611.60.0
Apr / -0°6711.56.313.21.7
May15° / 8111.61.314.64.2
Jun18° / 10°8011.4015.35.4
Jul22° / 15°11012.10156.0
Aug23° / 16°13313.4013.86.1
Sep20° / 12°12112.3012.35.8
Oct14° / 85110.410.84.0
Nov / -1°7211.25.79.40.7
Dec-1° / -7°729.710.58.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23664
33763
43664
53763
63763
73763
83862
93862
103862
113961
123961
134159
144159
154258
164258
174357
184357
194357
204357
214654
224654
234654
244753
254753
264753
274753
284852
294951
304951

Chance of precipitation in September

Any precipitation

Mombetsu gets around 121 mm of rain over 12.3 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 41% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
239
339
439
539
639
740
840
940
1041
1141
1241
1342
1442
1542
1642
1742
1842
1942
2042
2142
2242
2342
2441
2541
2640
2740
2839
2939
3039

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 57% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1233527141
2243626131
3263625121
4273624111
5293722111
6313721101
733372091
836371891
938361781
1040361671
1143351471
1246341361
1349331250
1452321150
1556301040
165829940
176227830
186525730
196923620
207221520
217320520
227618420
238016310
248115310
258314210
268413210
278712100
288811100
298910100
30919000

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min 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 90 minutes over September. Sunrise moves from 4:54 AM to 5:29 AM, and sunset from 5:59 PM to 5:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.14:545:59
213.04:555:57
313.04:565:55
412.94:575:53
512.94:595:51
612.85:005:49
712.85:015:47
812.75:025:45
912.75:035:44
1012.65:055:42
1112.65:065:40
1212.55:075:38
1312.55:085:36
1412.45:095:34
1512.45:115:32
1612.35:125:30
1712.25:135:28
1812.25:145:26
1912.15:155:24
2012.15:175:22
2112.05:185:20
2212.05:195:18
2311.95:205:16
2411.95:225:14
2511.85:235:12
2611.85:245:11
2711.75:255:09
2811.75:265:07
2911.65:285:05
3011.65:295:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.81 kWh/m².

For context, solar energy here swings from a low near 1.58 kWh/m² to a high of 5.48 kWh/m² in May across the year — September's 3.81 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.1Bright
54.1Bright
64.1Bright
74.0Bright
84.0Bright
94.0Moderate
104.0Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.8Moderate
153.8Moderate
163.8Moderate
173.7Moderate
183.7Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.6Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.4Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Hazard calendar for Mombetsu

In seasonPeak

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

Mombetsu 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 Mombetsu?

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

5.8
Sightseeing
3rd-best month of the year
3.1
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Mombetsu for sightseeing.

What to pack for Mombetsu in September

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

In September, Mombetsu sees daytime highs around 20°C and nights near 12°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Mombetsu in September

The nearest coast averages about 17°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 17°C and coldest in February near -1°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan0Bracing
Feb-1Bracing
Mar0Bracing
Apr2Bracing
May5Bracing
Jun10Bracing
Jul14Bracing
Aug17Cool
Sep17Cool
Oct13Bracing
Nov7Bracing
Dec3Bracing

UV index in Mombetsu 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 Mombetsu peaks around August 14 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowAug 14UV 8Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May7High
Jun7High
Jul7High
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Mombetsu?

Mombetsu sits at 44.4°N, 143.4°E, 16 m above sea level, in Japan. The nearest listed city is Engaru, 37 km away.

Fukagawa

Topography around Mombetsu

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

Within 3 km, the terrain around Mombetsu has significant variations in elevation — a maximum elevation change of 340 m around an average of 40 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 420 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,956 m.

The land around Mombetsu is covered by water (41%), trees (28%) and artificial surfaces (22%) within 3 km, water (50%) and trees (37%) within 16 km, and trees (58%) and water (32%) within 80 km.

3 km
340 m
16 km
420 m
80 km
1,956 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Engaru 37 km · Nayoro 71 km · Kitami 75 km · Minamishibetsuchō 81 km · Abashiri 82 km · Motomachi 83 km · Asahikawa 102 km · Fukagawa 127 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 Mombetsu (44.3525°, 143.3525°, elevation 16 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).