Niseko weather in August

In August, Niseko sees average daytime highs of 24°C and overnight lows near 17°C, with 182 mm of rain across 13.8 wet days and about 13.7 hours of daylight. It is the 1st-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 17% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Niseko's 8th-clearest and 11th-windiest month. For the whole year in context, see Niseko's year-round climate.

Daytime high
24°
1st warmest
Overnight low
17°
12th coldest
Rainfall
182 mm
13.8 wet days
Daylight
13 h 48 min
4:49 AM – 6:34 PM
Cloud cover
72%
8th clearest
Wind
6 km/h
11th windiest
Solar energy
4.39 kWh/m²
Travel score
6.1
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical August day in Niseko reaches about 24°C in the afternoon and slips back to 17°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 27°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12418
22418
32418
42418
52518
62418
72418
82418
92418
102418
112418
122418
132418
142418
152418
162417
172417
182417
192417
202417
212417
222417
232317
242317
252316
262316
272316
282316
292316
302316
312316

How August really feels in Niseko

Once humidity and wind are folded in, August 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

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

Niseko weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -10°5812.618.59.20.0
Feb-2° / -9°5110.415.610.30.0
Mar / -6°7113.213.911.60.0
Apr / 7511.95.213.11.7
May15° / 9412.60.314.44.3
Jun19° / 11°7710.6015.15.8
Jul23° / 16°13613.9014.86.0
Aug24° / 17°18213.8013.76.1
Sep20° / 12°14113.9012.35.6
Oct14° / 9913.70.610.83.7
Nov / -1°9214.810.19.60.6
Dec-1° / -7°7614.518.88.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 14% of August, with mostly cloudy or overcast conditions the remaining 69%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
42971
52971
62971
72971
82971
92971
102971
112971
122971
132971
142971
152872
162971
172971
183070
193070
203070
213169
223169
233169
243367
253466
263466
273466
283565
293565
303664
313664

Chance of precipitation in August

Any precipitation

Niseko gets around 182 mm of rain over 13.8 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 45% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
144
244
344
445
545
645
745
845
945
1045
1145
1245
1345
1445
1545
1645
1745
1845
1945
2045
2145
2245
2344
2445
2545
2645
2745
2845
2945
3045
3146

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1215333713
2215333713
3214333714
4214333714
5114333714
6114333714
7115343713
8115343613
9215353613
10215363512
11215363512
12215373411
13316383311
14316393210
15316393210
1641740319
1741740308
1851841298
1951841287
2061941277
2172041267
2272041256
2382141246
2482241245
2592241235
2692340235
27102439224
28112538224
29112637214
30122736214
31132935203

Wind in August

Winds average 6 km/h in August.

Across August, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 4:32 AM to 5:05 AM, and sunset from 6:54 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.44:326:54
214.34:336:53
314.34:346:52
414.34:356:51
514.24:366:50
614.24:386:48
714.14:396:47
814.14:406:46
914.14:416:44
1014.04:426:43
1114.04:436:42
1213.94:446:40
1313.94:456:39
1413.84:466:37
1513.84:476:36
1613.84:496:34
1713.74:506:33
1813.74:516:31
1913.64:526:30
2013.64:536:28
2113.54:546:26
2213.54:556:25
2313.44:566:23
2413.44:576:21
2513.44:596:20
2613.35:006:18
2713.35:016:16
2813.25:026:15
2913.25:036:13
3013.15:046:11
3113.15:056:09

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.39 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 5.48 kWh/m² in May across the year — August's 4.39 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
314.1Bright
Planning a trip in August

Hazard calendar for Niseko

In seasonPeak

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

Niseko 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 August a good time to visit Niseko?

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

6.1
Sightseeing
1st-best month of the year
5.1
Beach & pool
1st-best month of the year

August is a reasonable time to visit Niseko for sightseeing.

What to pack for Niseko in August

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

In August, Niseko sees daytime highs around 24°C and nights near 17°C. Worth packing: light clothes and rain gear. About 14 days see rain.

light clothesrain gear

Sea temperature near Niseko in August

The nearest coast averages about 22°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 26 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 Niseko in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Niseko 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 Niseko in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Niseko 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 Niseko?

Niseko sits at 42.8°N, 140.7°E, 0 m above sea level, in Japan. The nearest listed city is Kutchan, 11 km away.

Topography around Niseko

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

Within 3 km, the terrain around Niseko has only modest variations in elevation — a maximum elevation change of 199 m around an average of 161 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,881 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,867 m.

The land around Niseko is covered by trees (56%) and cropland (31%) within 3 km, trees (80%) within 16 km, and water (47%) and trees (44%) within 80 km.

3 km
199 m
16 km
1,881 m
80 km
1,867 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Kutchan 11 km · Date 41 km · Yoichi 44 km · Otaru 50 km · Noboribetsu 57 km · Muroran 60 km · Sapporo 61 km · Shiraoi 61 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 Niseko (42.8089°, 140.686°, elevation 0 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).