Tosa weather in August

In August, Tosa sees average daytime highs of 29°C and overnight lows near 24°C, with 298 mm of rain across 20.6 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 29°C through the month. The sky is clear or mostly clear about 27% 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 Tosa's 9th-clearest and 10th-windiest month. For the whole year in context, see Tosa's year-round climate.

Daytime high
29°
1st warmest
Overnight low
24°
12th coldest
Rainfall
298 mm
20.6 wet days
Daylight
13 h 18 min
5:33 AM – 6:48 PM
Cloud cover
62%
9th clearest
Wind
7 km/h
10th windiest
Solar energy
5.36 kWh/m²
Travel score
4.1
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical August day in Tosa reaches about 29°C in the afternoon and slips back to 24°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 2°C warmer than September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12925
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
152925
162925
172925
182925
192924
202924
212924
222924
232924
242924
252924
262924
272924
282924
292924
302924
312924

How August really feels in Tosa

Once humidity and wind are folded in, August averages 28 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
28
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.

Tosa 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° / 726.30.3102.6
Feb11° / 987.90.510.82.9
Mar14° / 16411.6011.74.2
Apr19° / 11°20311.6012.85.7
May22° / 16°24213.2013.76.1
Jun25° / 20°35819.1014.25.0
Jul28° / 24°37421.60144.2
Aug29° / 24°29820.6013.24.1
Sep27° / 22°32317.1012.25.4
Oct23° / 16°23011.2011.26.7
Nov18° / 11°1188.4010.36.0
Dec13° / 906.309.83.8

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24456
34456
44456
54456
64456
74555
84555
94555
104555
114555
124456
134258
144258
154357
164357
174456
184456
194456
204456
214456
224456
234456
244456
254456
264357
274357
284456
294456
304456
314555

Chance of precipitation in August

Any precipitation

Tosa gets around 298 mm of rain over 20.6 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 66% and peaks near 69% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
164
264
364
463
563
663
763
863
963
1063
1164
1264
1364
1465
1565
1666
1767
1867
1968
2068
2169
2269
2369
2469
2569
2669
2769
2869
2968
3068
3167

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 60% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1026236
2026236
3026137
4026137
5016138
6016138
7016138
8026038
9026038
10026038
11026038
12035938
13035938
14035938
15035938
16045937
17145936
18155935
19165934
20166033
21176032
22186130
23196129
242106127
252116225
262126224
272136322
283156220
293166318
303176317
313196216

Wind in August

Winds average 7 km/h in August.

Across August, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 5:22 AM to 5:43 AM, and sunset from 7:03 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:227:03
213.75:237:02
313.65:237:01
413.65:247:00
513.65:256:59
613.55:256:58
713.55:266:57
813.55:276:56
913.55:286:55
1013.45:286:54
1113.45:296:53
1213.45:306:52
1313.35:316:51
1413.35:316:50
1513.35:326:49
1613.35:336:48
1713.25:336:47
1813.25:346:46
1913.25:356:44
2013.15:366:43
2113.15:366:42
2213.15:376:41
2313.05:386:40
2413.05:386:38
2513.05:396:37
2612.95:406:36
2712.95:416:34
2812.95:416:33
2912.85:426:32
3012.85:436:31
3112.85:436:29

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.36 kWh/m².

For context, solar energy here swings from a low near 2.59 kWh/m² to a high of 5.6 kWh/m² in May across the year — August's 5.36 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.1Bright
265.1Bright
275.1Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in August

Hazard calendar for Tosa

In seasonPeak

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

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

Tosa'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 Tosa?

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

4.1
Sightseeing
9th-best month of the year
5.3
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Tosa for sightseeing.

What to pack for Tosa in August

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

In August, Tosa sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near Tosa 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 at the nearest coast (about 16 km away) is warmest in August at about 28°C and coldest in February near 17°C.

It's comfortable for a long swim from May 8 to Dec 15 — about 7.3 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan18Cool
Feb17Cool
Mar17Cool
Apr18Cool
May21Refreshing
Jun23Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec20Cool

UV index in Tosa 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 Tosa peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highExtremeVery highModerateJun 23UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Tosa 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 Tosa is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1321 µg/m³Oct 1311 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar20Moderate
Apr22Moderate
May19Moderate
Jun16Moderate
Jul13Moderate
Aug12Moderate
Sep11Good
Oct11Good
Nov12Good
Dec11Good
Location & terrain

Where is Tosa?

Tosa sits at 33.5°N, 133.4°E, 13 m above sea level, in Japan. The nearest listed city is Ino, 5.0 km away.

Topography around Tosa

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

Within 3 km, the terrain around Tosa has significant variations in elevation — a maximum elevation change of 253 m around an average of 39 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 931 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,939 m.

The land around Tosa is covered by trees (44%), artificial surfaces (25%) and cropland (20%) within 3 km, trees (56%) and water (28%) within 16 km, and trees (61%) and water (34%) within 80 km.

3 km
253 m
16 km
931 m
80 km
1,939 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Ino 5.0 km · Kochi 10 km · Susaki 19 km · Nankoku 20 km · Tosayamadachō-nakano 25 km · Yamashita 25 km · Aki 42 km · Shinagawa 43 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 Tosa (33.5048°, 133.4447°, elevation 13 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).