Wakkanai weather in September

In September, Wakkanai sees average daytime highs of 19°C and overnight lows near 14°C, with 114 mm of rain across 12 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 21°C in the first days to 17°C by the end. The sky is clear or mostly clear about 33% 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 Wakkanai's 2nd-clearest and 9th-windiest month. For the whole year in context, see Wakkanai's year-round climate.

Daytime high
19°
3rd warmest
Overnight low
14°
10th coldest
Rainfall
114 mm
12 wet days
Daylight
12 h 18 min
5:18 AM – 5:37 PM
Cloud cover
58%
2nd clearest
Wind
18 km/h
9th windiest
Solar energy
3.95 kWh/m²
Travel score
5.8
out of 10

Wakkanai is city in Sōya Subprefecture, Hokkaido, Japan.

Density
44/km²
people per km²
Founded
1949

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 21°C in the first days to 17°C by the end.

A typical September day in Wakkanai reaches about 19°C in the afternoon and slips back to 14°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 22°C. Set against its neighbours, September runs about 2°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12117
22117
32116
42116
52116
62116
72116
82016
92016
102016
112015
122015
132015
142015
151915
161914
171914
181914
191914
201814
211814
221813
231813
241813
251813
261713
271712
281712
291712
301712

How September really feels in Wakkanai

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.

Wakkanai 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-3° / -7°5613.320.88.90.0
Feb-3° / -7°4310.515.710.10.0
Mar / -3°5410.71211.60.0
Apr / 589.74.413.20.8
May11° / 7110.30.514.72.9
Jun15° / 10°629.1015.44.6
Jul19° / 15°969.4015.16.0
Aug22° / 17°11510.7013.96.3
Sep19° / 14°11412012.35.8
Oct13° / 9613.50.110.73.5
Nov / 9114.89.49.30.6
Dec-0° / -4°7616.420.38.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24357
34456
44456
54456
64456
74555
84555
94555
104555
114654
124654
134654
144753
154753
164951
174951
185050
194951
205050
215149
225149
235149
245149
255248
265248
275248
285347
295347
305347

Chance of precipitation in September

Any precipitation

Wakkanai gets around 114 mm of rain over 12 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 40% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
336
436
536
637
737
837
938
1038
1139
1239
1339
1439
1540
1640
1740
1841
1941
2041
2142
2242
2342
2442
2542
2642
2742
2843
2943
3043

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 48% 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 (%)
1172934172
2193034161
3203034151
4223033141
5243032131
6253032121
7273031111
8293029101
932312891
1034312781
1137312570
1239312360
1342302250
1445302050
1548301840
1651301630
1752301530
1856291320
1958291120
2060281020
216227920
226427810
236626710
246825610
257024510
267223410
277522300
287621300
297820200
308018200

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2920light breeze
3020light breeze

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 4:59 AM to 5:36 AM, and sunset from 6:07 PM to 5:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.14:596:07
213.15:016:05
313.05:026:03
413.05:036:01
512.95:045:59
612.95:065:57
712.85:075:55
812.75:085:53
912.75:095:51
1012.65:115:49
1112.65:125:47
1212.55:135:45
1312.55:145:43
1412.45:165:41
1512.45:175:39
1612.35:185:37
1712.35:195:35
1812.25:215:33
1912.25:225:31
2012.15:235:29
2112.05:255:27
2212.05:265:25
2311.95:275:23
2411.95:285:21
2511.85:305:19
2611.85:315:17
2711.75:325:15
2811.75:345:13
2911.65:355:11
3011.65:365:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.95 kWh/m².

For context, solar energy here swings from a low near 1.29 kWh/m² to a high of 5.62 kWh/m² in May across the year — September's 3.95 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.1Bright
134.0Bright
144.0Bright
154.0Moderate
164.0Moderate
173.9Moderate
183.9Moderate
193.9Moderate
203.8Moderate
213.8Moderate
223.7Moderate
233.7Moderate
243.6Moderate
253.6Moderate
263.6Moderate
273.5Moderate
283.5Moderate
293.5Moderate
303.4Moderate
Planning a trip in September

Is September a good time to visit Wakkanai?

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
2.6
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Wakkanai for sightseeing.

What to pack for Wakkanai in September

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

In September, Wakkanai sees daytime highs around 19°C and nights near 14°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Wakkanai in September

The nearest coast averages about 20°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 20°C and coldest in February near 3°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
Jan4Bracing
Feb3Bracing
Mar4Bracing
Apr6Bracing
May9Bracing
Jun12Bracing
Jul17Cool
Aug20Cool
Sep20Cool
Oct16Cool
Nov11Bracing
Dec7Bracing

UV index in Wakkanai in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wakkanai peaks around August 13 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 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 highModerateLowAug 13UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar2Moderate
Apr5Moderate
May7High
Jun6High
Jul7High
Aug8Very high
Sep5High
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Wakkanai 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 Wakkanai is worst in April — around 15 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (December, 5 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1115 µg/m³Dec 235 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb9Good
Mar15Moderate
Apr15Moderate
May12Moderate
Jun7Good
Jul7Good
Aug7Good
Sep6Good
Oct8Good
Nov8Good
Dec5Good
Location & terrain

Where is Wakkanai?

Wakkanai sits at 45.4°N, 141.7°E, 7 m above sea level, in Japan. The nearest listed city is Makubetsu, 12 km away.

NayoroNevel’skMinamishibetsuchōKorsakovRumoiMombetsu

Topography around Wakkanai

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

Within 3 km, the terrain around Wakkanai has only modest variations in elevation — a maximum elevation change of 206 m around an average of 49 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 208 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,669 m.

The land around Wakkanai is covered by trees (40%) and water (32%) within 3 km, water (68%) within 16 km, and water (74%) and trees (20%) within 80 km.

3 km
206 m
16 km
208 m
80 km
1,669 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Makubetsu 12 km · Nayoro 133 km · Nevel’sk 142 km · Minamishibetsuchō 150 km · Korsakov 161 km · Rumoi 164 km · Mombetsu 177 km · Kholmsk 184 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 Wakkanai (45.4094°, 141.6739°, elevation 7 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).