Oshima weather in August

In August, Oshima sees average daytime highs of 28°C and overnight lows near 25°C, with 148 mm of rain across 11.3 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 36% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 54 min at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Oshima's 1st-clearest and 11th-windiest month. For the whole year in context, see Oshima's year-round climate.

Daytime high
28°
1st warmest
Overnight low
25°
12th coldest
Rainfall
148 mm
11.3 wet days
Daylight
13 h 24 min
5:14 AM – 6:40 PM
Cloud cover
56%
1st clearest
Wind
13 km/h
11th windiest
Solar energy
5.38 kWh/m²
Travel score
5.9
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical August day in Oshima reaches about 28°C in the afternoon and slips back to 25°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°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)
12825
22825
32825
42825
52825
62825
72825
82825
92825
102825
112825
122825
132825
142825
152825
162825
172825
182825
192825
202825
212825
222825
232825
242824
252824
262824
272724
282724
292724
302724
312724

How August really feels in Oshima

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.

Oshima weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 19624.18.89.80.5
Feb / 13218.97.310.60.6
Mar / 13416.12.211.71.7
Apr14° / 11712.10.112.93.8
May18° / 14°11811.50145.8
Jun22° / 19°14711014.56.3
Jul26° / 23°22314.1014.35.9
Aug28° / 25°14811.3013.45.9
Sep25° / 22°18813.2012.36.2
Oct20° / 16°15013.10115.8
Nov15° / 11°17417.50103.6
Dec / 22323.44.49.51.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% 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 (%)
15248
25248
35248
45347
55347
65248
75248
85248
95347
105248
115248
125149
135149
145149
155149
165149
175149
185149
195050
205050
215050
225050
234951
244852
254852
264753
274654
284753
294654
304654
314654

Chance of precipitation in August

Any precipitation

Oshima gets around 148 mm of rain over 11.3 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 37% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
131
231
331
432
532
632
732
833
933
1034
1134
1235
1336
1436
1537
1638
1738
1839
1939
2039
2140
2240
2340
2440
2541
2641
2741
2842
2942
3043
3143

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
101116226
201106227
301106128
401106029
501106029
601105930
701105930
801105930
902105830
1002115730
1102115730
1202115829
1302115829
1402125828
1502135728
1602135827
1703145726
1803155626
1913175425
2013185424
2113205323
2214215321
2314235220
2415255019
2515265018
2616284916
2716304815
2817314714
2918334613
3019344511
31110364310

Wind in August

Winds average 13 km/h in August.

Across August, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 54 min at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over August. Sunrise moves from 5:02 AM to 5:27 AM, and sunset from 6:56 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:026:56
213.95:026:55
313.95:036:55
413.85:046:54
513.85:056:52
613.85:066:51
713.75:076:50
813.75:076:49
913.75:086:48
1013.65:096:47
1113.65:106:46
1213.65:116:45
1313.55:126:44
1413.55:126:42
1513.55:136:41
1613.45:146:40
1713.45:156:39
1813.45:166:37
1913.35:176:36
2013.35:186:35
2113.25:186:33
2213.25:196:32
2313.25:206:31
2413.15:216:29
2513.15:226:28
2613.15:236:26
2713.05:246:25
2813.05:246:23
2912.95:256:22
3012.95:266:21
3112.95:276:19

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.38 kWh/m².

For context, solar energy here swings from a low near 1.89 kWh/m² to a high of 5.85 kWh/m² in May across the year — August's 5.38 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.6Bright
115.5Bright
125.5Bright
135.5Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.2Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Oshima

In seasonPeak

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

Oshima 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 Oshima?

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

5.9
Sightseeing
3rd-best month of the year
6.6
Beach & pool
1st-best month of the year

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

What to pack for Oshima in August

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

In August, Oshima sees daytime highs around 28°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Oshima 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 at the nearest coast (about 18 km away) is warmest in August at about 27°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 17 to Nov 3 — about 4.6 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb11Bracing
Mar11Bracing
Apr12Bracing
May16Cool
Jun20Cool
Jul24Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Oshima 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 Oshima peaks around August 14 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 14UV 10Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug10Very high
Sep9Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Oshima 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 Oshima is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1722 µg/m³Oct 1110 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar21Moderate
Apr23Moderate
May21Moderate
Jun18Moderate
Jul15Moderate
Aug12Good
Sep10Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Oshima?

Oshima sits at 37.0°N, 136.8°E, 11 m above sea level, in Japan. The nearest listed city is Hakui, 12 km away.

Topography around Oshima

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

Within 3 km, the terrain around Oshima has only modest variations in elevation — a maximum elevation change of 84 m around an average of 11 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 478 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,375 m.

The land around Oshima is covered by water (40%) and trees (30%) within 3 km, water (44%) and trees (40%) within 16 km, and water (55%) and trees (34%) within 80 km.

3 km
84 m
16 km
478 m
80 km
2,375 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Hakui 12 km · Hitoto 12 km · Nanao 19 km · Himimachi 24 km · Himi 24 km · Kahoku 26 km · Anamizu 30 km · Takaoka 34 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 Oshima (36.9871°, 136.7725°, elevation 11 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).