Sasebo weather in August

In August, Sasebo sees average daytime highs of 31°C and overnight lows near 25°C, with 178 mm of rain across 14.7 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 31°C through the month. The sky is clear or mostly clear about 31% of the time in August, and the air most often feels oppressive.

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 Sasebo's 5th-clearest and 10th-windiest month. For the whole year in context, see Sasebo's year-round climate.

Daytime high
31°
1st warmest
Overnight low
25°
12th coldest
Rainfall
178 mm
14.7 wet days
Daylight
13 h 12 min
5:48 AM – 7:02 PM
Cloud cover
62%
5th clearest
Wind
11 km/h
10th windiest
Solar energy
4.96 kWh/m²
Travel score
4.0
out of 10

Sasebo is city in Nagasaki Prefecture, Japan.

Density
571/km²
people per km²
Founded
1902

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 31°C through the month.

A typical August day in Sasebo reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°C. Set against its neighbours, August runs about 2°C warmer than July and about 3°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13126
23126
33126
43126
53126
63126
73126
83126
93126
103126
113126
123126
133126
143125
153125
163125
173125
183125
193125
203125
213125
223125
233025
243025
253025
263024
273024
283024
293024
303024
313024

How August really feels in Sasebo

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.

Sasebo 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 daysSnow daysDaylight (hours)Travel score
Jan10° / 618.40.710.12.3
Feb11° / 728.40.510.82.8
Mar15° / 11810.50.111.74.3
Apr19° / 12°13810.4012.86.0
May23° / 16°14910.1013.76.7
Jun26° / 20°30815.7014.15.5
Jul29° / 24°28516.30144.4
Aug31° / 25°17814.7013.24.0
Sep28° / 22°18612.3012.25.8
Oct23° / 17°1026.9011.27.4
Nov18° / 11°908.1010.36.0
Dec12° / 697.50.19.83.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 (%)
15149
25050
35050
44852
54753
64753
74753
84654
94555
104456
114456
124357
134357
144258
154258
164258
174258
184357
194357
204456
214456
224456
234555
244555
254555
264654
274654
284654
294753
304753
314852

Chance of precipitation in August

Any precipitation

Sasebo gets around 178 mm of rain over 14.7 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 48% and peaks near 50% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
143
243
343
444
544
645
745
846
946
1047
1147
1248
1348
1448
1549
1649
1749
1849
1950
2050
2150
2250
2350
2449
2549
2649
2749
2849
2949
3049
3149

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10034651
20034552
30034552
40034552
50034552
60034651
70034651
80034651
90034651
100034651
110034651
120034651
130044750
140044749
150044748
160154748
170154747
180164646
190174645
200184743
2101104742
2202114740
2302124838
2402134836
2503154934
2603164931
2703175129
2804185127
2904205125
3005215123
3115225121

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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

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 7:17 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:377:17
213.65:387:16
313.65:397:15
413.65:407:14
513.65:407:13
613.55:417:13
713.55:427:12
813.55:427:11
913.45:437:10
1013.45:447:09
1113.45:457:08
1213.45:457:07
1313.35:467:06
1413.35:477:05
1513.35:477:03
1613.25:487:02
1713.25:497:01
1813.25:497:00
1913.15:506:59
2013.15:516:58
2113.15:526:56
2213.05:526:55
2313.05:536:54
2413.05:546:53
2513.05:546:52
2612.95:556:50
2712.95:566:49
2812.95:566:48
2912.85:576:46
3012.85:586:45
3112.85:596:44

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.96 kWh/m².

For context, solar energy here swings from a low near 2.13 kWh/m² to a high of 5.4 kWh/m² in May across the year — August's 4.96 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.2Bright
85.2Bright
95.2Bright
105.1Bright
115.1Bright
125.1Bright
135.0Bright
145.0Bright
155.0Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.6Bright
314.5Bright
Planning a trip in August

Hazard calendar for Sasebo

In seasonPeak

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

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

Sasebo's rainy season runs May–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 Sasebo?

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

4.0
Sightseeing
9th-best month of the year
6.0
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Sasebo for sightseeing.

What to pack for Sasebo in August

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

In August, Sasebo sees daytime highs around 31°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 Sasebo 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 February near 15°C.

It's comfortable for a long swim from Jun 1 to Nov 26 — about 5.9 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Cool
Apr16Cool
May19Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec18Cool

UV index in Sasebo 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 Sasebo peaks around July 18 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 18UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Sasebo 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 Sasebo is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateGoodModerateApr 1324 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May21Moderate
Jun17Moderate
Jul12Good
Aug12Moderate
Sep12Good
Oct11Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Sasebo?

Sasebo sits at 33.2°N, 129.7°E, 8 m above sea level, in Japan. The nearest listed city is Arita, 16 km away.

Topography around Sasebo

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

Within 3 km, the terrain around Sasebo has significant variations in elevation — a maximum elevation change of 561 m around an average of 104 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 779 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,455 m.

The land around Sasebo is covered by trees (46%) and artificial surfaces (38%) within 3 km, trees (58%) and water (28%) within 16 km, and water (66%) and trees (24%) within 80 km.

3 km
561 m
16 km
779 m
80 km
1,455 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Arita 16 km · Imarichō-kō 18 km · Matsuura 19 km · Saikai 21 km · Ureshinomachi-shimojuku 27 km · Hirado 27 km · Takeo 28 km · Kashima 35 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 Sasebo (33.1683°, 129.725°, elevation 8 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).