Sarubetsu weather in September

In September, Sarubetsu sees average daytime highs of 21°C and overnight lows near 12°C, with 171 mm of rain across 12.5 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 19°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 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Sarubetsu's 9th-clearest and 9th-windiest month. For the whole year in context, see Sarubetsu's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
171 mm
12.5 wet days
Daylight
12 h 18 min
5:12 AM – 5:30 PM
Cloud cover
68%
9th clearest
Wind
7 km/h
9th windiest
Solar energy
3.42 kWh/m²
Travel score
5.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 19°C by the end.

A typical September day in Sarubetsu reaches about 21°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 25°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52215
62215
72214
82214
92214
102214
112214
122213
132113
142113
152113
162112
172112
182012
192012
202011
212011
222011
232011
241910
251910
261910
271910
281910
29189
30189

How September really feels in Sarubetsu

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.

Sarubetsu 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-2° / -13°616.77.19.20.0
Feb-1° / -12°487.27.710.20.0
Mar / -6°779.78.211.60.1
Apr11° / 8810.84.113.12.6
May16° / 10010.80.414.45.0
Jun19° / 11°899.8015.15.9
Jul22° / 15°11411.3014.86.2
Aug24° / 17°15913.1013.86.2
Sep21° / 12°17112.5012.35.9
Oct15° / 11510.20.110.84.7
Nov / -1°819.42.29.51.5
Dec / -9°7686.68.90.0

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 12% of September, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33367
43367
53466
63367
73367
83466
93466
103367
113466
123565
133664
143664
153664
163763
173862
183862
193961
203961
213961
224159
234159
244159
254357
264357
274456
284456
294555
304555

Chance of precipitation in September

Any precipitation

Sarubetsu gets around 171 mm of rain over 12.5 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 42% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
144
244
344
445
545
645
745
845
945
1045
1145
1244
1344
1443
1543
1642
1741
1841
1940
2040
2140
2239
2339
2438
2538
2638
2737
2837
2937
3037

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 49% 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 (%)
1163232172
2173332172
3183431162
4193430152
5213529142
6223527132
7243526132
8263525122
9293523112
10313522102
1134352092
1237341892
1340341781
1444331571
1547321361
1650311261
1754301051
185729941
196027841
206326731
216525631
226823531
237022521
247321420
257620310
267719310
277918210
288017210
298216200
308315200

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
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 4:56 AM to 5:28 AM, and sunset from 5:57 PM to 5:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.04:565:57
213.04:575:55
312.94:585:54
412.94:595:52
512.85:005:50
612.85:015:48
712.75:025:46
812.75:035:44
912.65:055:43
1012.65:065:41
1112.55:075:39
1212.55:085:37
1312.45:095:35
1412.45:105:33
1512.35:115:31
1612.35:125:30
1712.25:135:28
1812.25:155:26
1912.15:165:24
2012.15:175:22
2112.05:185:20
2212.05:195:18
2311.95:205:17
2411.95:215:15
2511.85:235:13
2611.85:245:11
2711.75:255:09
2811.75:265:07
2911.65:275:05
3011.65:285:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.42 kWh/m².

For context, solar energy here swings from a low near 1.93 kWh/m² to a high of 5.16 kWh/m² in May across the year — September's 3.42 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.5Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.4Moderate
143.4Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.3Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Sarubetsu

In seasonPeak

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

Sarubetsu 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 Sarubetsu?

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

5.9
Sightseeing
3rd-best month of the year
3.5
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Sarubetsu for sightseeing.

What to pack for Sarubetsu in September

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

In September, Sarubetsu sees daytime highs around 21°C and nights near 12°C. Worth packing: rain gear. About 13 days see rain.

rain gear

Sea temperature near Sarubetsu 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 at the nearest coast (about 36 km away) is warmest in August at about 18°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
Jan3Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May6Bracing
Jun11Bracing
Jul15Cool
Aug18Cool
Sep17Cool
Oct14Bracing
Nov10Bracing
Dec7Bracing

UV index in Sarubetsu 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 Sarubetsu 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
May7Very high
Jun7Very high
Jul5Moderate
Aug9Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Sarubetsu 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 Sarubetsu is worst in April — around 15 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1315 µg/m³Dec 176 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb10Good
Mar14Moderate
Apr15Moderate
May13Moderate
Jun9Good
Jul9Good
Aug8Good
Sep7Good
Oct8Good
Nov7Good
Dec6Good
Location & terrain

Where is Sarubetsu?

Sarubetsu sits at 42.9°N, 143.3°E, 25 m above sea level, in Japan. The nearest listed city is Obihiro, 12 km away.

Topography around Sarubetsu

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

Within 3 km, the terrain around Sarubetsu has only modest variations in elevation — a maximum elevation change of 155 m around an average of 86 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 333 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,032 m.

The land around Sarubetsu is covered by cropland (52%) and trees (40%) within 3 km, trees (43%) and cropland (42%) within 16 km, and trees (65%) within 80 km.

3 km
155 m
16 km
333 m
80 km
2,032 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Obihiro 12 km · Otofuke 17 km · Memuro-minami 25 km · Kushiro 85 km · Furano 94 km · Shimo-furano 94 km · Shizunai-furukawachō 99 km · Kitami 113 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 Sarubetsu (42.8724°, 143.3376°, elevation 25 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).