Tsushima weather in August

In August, Tsushima sees average daytime highs of 27°C and overnight lows near 26°C, with 189 mm of rain across 11.7 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 37% of the time in August, and the air most often feels miserable.

Daylight stretches from about 13 h 42 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Tsushima's 5th-clearest and 9th-windiest month. For the whole year in context, see Tsushima's year-round climate.

Daytime high
27°
1st warmest
Overnight low
26°
12th coldest
Rainfall
189 mm
11.7 wet days
Daylight
13 h 18 min
5:48 AM – 7:06 PM
Cloud cover
57%
5th clearest
Wind
23 km/h
9th windiest
Solar energy
5.3 kWh/m²
Travel score
6.3
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical August day in Tsushima reaches about 27°C in the afternoon and slips back to 26°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, August runs about 2°C warmer than July and about 2°C warmer than September.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12726
22726
32726
42726
52726
62726
72726
82726
92726
102726
112726
122726
132726
142726
152726
162726
172726
182726
192726
202726
212726
222726
232726
242726
252725
262725
272725
282725
292625
302625
312625

Tsushima weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 658.60.8101.9
Feb10° / 658.40.410.72.2
Mar12° / 10°1139.80.111.73.3
Apr15° / 13°1249.3012.84.7
May18° / 17°1298.3013.86.1
Jun21° / 20°20210.8014.26.2
Jul25° / 24°21511.8014.16.4
Aug27° / 26°18911.7013.36.3
Sep25° / 23°17110.6012.26.8
Oct21° / 19°916.9011.17.1
Nov16° / 14°828.3010.25.5
Dec12° / 638.50.39.83.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 13% of August, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25446
35446
45446
55446
65248
75248
85248
95050
105050
115050
124951
134951
144951
154852
164852
174852
184951
194951
204951
215050
225050
235050
244951
254951
264852
274852
284753
294852
304852
314753

Chance of precipitation in August

Any precipitation

Tsushima gets around 189 mm of rain over 11.7 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 38% and peaks near 41% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
129
229
330
431
532
632
733
834
935
1036
1137
1237
1338
1439
1539
1640
1740
1841
1941
2041
2141
2241
2341
2441
2541
2641
2741
2841
2941
3041
3140

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the miserable band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1062569
2062470
3052471
4052471
5052471
6052570
7042670
8042769
9042868
10043066
11043165
12053362
13053560
14053659
15063757
16163954
17173953
18184051
191104049
201114048
211124046
221144045
232164043
242174041
252193940
262213938
273223936
283243834
293263832
304283830
314303728

Wind in August

Winds average 23 km/h in August.

Across August, daily wind ranges from about 22 km/h on the calmest days to 25 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
122breezy
222breezy
322breezy
422breezy
522breezy
622breezy
722breezy
822breezy
922breezy
1023breezy
1123breezy
1223breezy
1323breezy
1423breezy
1523breezy
1623breezy
1723breezy
1823breezy
1923breezy
2023breezy
2123breezy
2223breezy
2324breezy
2424breezy
2524breezy
2624breezy
2724breezy
2824breezy
2924breezy
3025breezy
3125breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 42 min at the start of August to 12 h 48 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 5:37 AM to 5:59 AM, and sunset from 7:21 PM to 6:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:377:21
213.75:387:20
313.75:397:19
413.65:397:18
513.65:407:17
613.65:417:16
713.65:427:15
813.55:427:14
913.55:437:13
1013.55:447:12
1113.45:457:11
1213.45:457:10
1313.45:467:09
1413.45:477:08
1513.35:487:07
1613.35:487:06
1713.35:497:04
1813.25:507:03
1913.25:517:02
2013.25:517:01
2113.15:527:00
2213.15:536:58
2313.15:546:57
2413.05:546:56
2513.05:556:54
2613.05:566:53
2712.95:566:52
2812.95:576:50
2912.95:586:49
3012.85:596:48
3112.85:596:46

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.3 kWh/m².

For context, solar energy here swings from a low near 2.41 kWh/m² to a high of 5.87 kWh/m² in May across the year — August's 5.3 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.7Bright
45.7Bright
55.7Bright
65.6Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Tsushima

In seasonPeak

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

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

Tsushima's rainy season runs March–September, 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 Tsushima?

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

6.3
Sightseeing
4th-best month of the year
6.4
Beach & pool
1st-best month of the year

August is a reasonable time to visit Tsushima for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Tsushima in August

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

In August, Tsushima sees daytime highs around 27°C and nights near 26°C. Pack light clothes. Worth having: rain gear, sun protection and a windbreaker. About 12 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Tsushima in August

The nearest coast averages about 27°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 27°C and coldest in March near 15°C.

It's comfortable for a long swim from Jun 6 to Nov 28 — about 5.8 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec19Cool

UV index in Tsushima 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 Tsushima peaks around August 24 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateAug 24UV 9Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Tsushima 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 Tsushima is worst in April — around 37 µg/m³ PM2.5 (poor), about 2.2× the cleanest month (September, 17 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateApr 1637 µg/m³Sep 2117 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb27Moderate
Mar35Poor
Apr37Poor
May35Poor
Jun27Moderate
Jul20Moderate
Aug19Moderate
Sep17Moderate
Oct17Moderate
Nov21Moderate
Dec19Moderate
Location & terrain

Where is Tsushima?

Tsushima sits at 34.2°N, 129.3°E, 6 m above sea level, in Japan. The nearest listed city is Iki, 62 km away.

Topography around Tsushima

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

Within 3 km, the terrain around Tsushima has significant variations in elevation — a maximum elevation change of 554 m around an average of 116 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 640 m; within 80 km, large variations in elevation — a maximum elevation change of 628 m.

The land around Tsushima is covered by trees (60%) and water (33%) within 3 km, water (67%) and trees (31%) within 16 km, and water (95%) within 80 km.

3 km
554 m
16 km
640 m
80 km
628 m
treesgrasslandartificial surfaceswater
August weather nearby: Iki 62 km · Geoje 86 km · Hirado 96 km · Kyosai 96 km · Sinhyeon 97 km · Busan 102 km · Matsuura 103 km · Karatsu 106 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 Tsushima (34.2063°, 129.2908°, elevation 6 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).