Sukumo weather in August

In August, Sukumo sees average daytime highs of 30°C and overnight lows near 25°C, with 192 mm of rain across 15.4 wet days and about 13.2 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 29% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 36 min at the start of August to 12 h 42 min by month's end. Set against the rest of the year, August is Sukumo's 8th-clearest and 9th-windiest month. For the whole year in context, see Sukumo's year-round climate.

Daytime high
30°
1st warmest
Overnight low
25°
12th coldest
Rainfall
192 mm
15.4 wet days
Daylight
13 h 12 min
5:36 AM – 6:50 PM
Cloud cover
61%
8th clearest
Wind
11 km/h
9th windiest
Solar energy
5.21 kWh/m²
Travel score
4.4
out of 10

Sukumo is city in Kōchi Prefecture, Japan.

Density
67/km²
people per km²
Founded
1954

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical August day in Sukumo reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 3°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13025
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243024
253024
263024
273024
283024
292924
302924
312924

How August really feels in Sukumo

Once humidity and wind are folded in, August averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Sukumo weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan11° / 666.310.12.8
Feb12° / 848.210.83.1
Mar15° / 13611.311.74.4
Apr19° / 12°1601112.86.0
May23° / 16°1891213.76.4
Jun25° / 20°32816.614.15.4
Jul29° / 24°25215.8144.6
Aug30° / 25°19215.413.24.4
Sep28° / 22°23914.912.25.4
Oct23° / 17°18310.111.27.0
Nov18° / 12°1088.710.36.1
Dec13° / 806.79.94.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24555
34456
44555
54654
64555
74555
84555
94555
104555
114555
124456
134456
144456
154555
164555
174456
184456
194555
204555
214555
224555
234555
244456
254555
264456
274456
284357
294357
304357
314357

Chance of precipitation in August

Any precipitation

Sukumo gets around 192 mm of rain over 15.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 50% and peaks near 56% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
149
249
349
449
549
649
749
849
949
1048
1148
1248
1347
1447
1547
1647
1747
1847
1948
2048
2149
2250
2350
2451
2552
2653
2754
2854
2955
3055
3156

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1025444
2025345
3025345
4025246
5025246
6025246
7025246
8025246
9025246
10035146
11035245
12035245
13045145
14145045
15145144
16155044
17155143
18165142
19175042
20275041
21285040
22295039
232105038
243105136
253115135
263125134
273135232
283145231
294155130
304165228
314185226

Wind in August

Winds average 11 km/h in August.

Across August, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 36 min at the start of August to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over August. Sunrise moves from 5:26 AM to 5:47 AM, and sunset from 7:04 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:267:04
213.65:277:04
313.65:277:03
413.65:287:02
513.55:297:01
613.55:297:00
713.55:306:59
813.55:316:58
913.45:316:57
1013.45:326:56
1113.45:336:55
1213.35:346:54
1313.35:346:53
1413.35:356:52
1513.35:366:51
1613.25:366:50
1713.25:376:49
1813.25:386:48
1913.15:386:47
2013.15:396:45
2113.15:406:44
2213.05:416:43
2313.05:416:42
2413.05:426:41
2512.95:436:39
2612.95:436:38
2712.95:446:37
2812.85:456:35
2912.85:456:34
3012.85:466:33
3112.75:476:32

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.21 kWh/m².

For context, solar energy here swings from a low near 2.56 kWh/m² to a high of 5.46 kWh/m² in May across the year — August's 5.21 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Sukumo

In seasonPeak

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

Sukumo sits in the Pacific typhoon belt; the season peaks July–October.

Sukumo's rainy season runs April–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Sukumo?

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

4.4
Sightseeing
8th-best month of the year
6.0
Beach & pool
1st-best month of the year

August is a reasonable time to visit Sukumo for sightseeing.

What to pack for Sukumo in August

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

In August, Sukumo sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Sukumo in August

The nearest coast averages about 28°C in August — 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 28°C and coldest in February near 18°C.

It's comfortable for a long swim from May 1 to Dec 23 — about 7.8 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb18Cool
Mar18Cool
Apr19Cool
May21Refreshing
Jun23Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec20Refreshing

UV index in Sukumo in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sukumo peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJun 23UV 11Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Sukumo 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 Sukumo is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1420 µg/m³Oct 1410 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Sukumo?

Sukumo sits at 32.9°N, 132.7°E, 12 m above sea level, in Japan. The nearest listed city is Mishōhirajō, 16 km away.

Topography around Sukumo

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

Within 3 km, the terrain around Sukumo has significant variations in elevation — a maximum elevation change of 454 m around an average of 116 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,052 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,528 m.

The land around Sukumo is covered by trees (76%) within 3 km, trees (79%) within 16 km, and water (62%) and trees (36%) within 80 km.

3 km
454 m
16 km
1,052 m
80 km
1,528 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Mishōhirajō 16 km · Nakamura 19 km · Shimoda 24 km · Uwajima 36 km · Uwa 52 km · Yawatahama 65 km · Ōzu 65 km · Uchiko 69 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 Sukumo (32.9333°, 132.7333°, elevation 12 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).