Tomioka weather in August

In August, Tomioka sees average daytime highs of 29°C and overnight lows near 22°C, with 225 mm of rain across 22.1 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 29°C in the first days to 27°C by the end. The sky is clear or mostly clear about 19% 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 48 min by month's end. Set against the rest of the year, August is Tomioka's 9th-clearest and 12th-windiest month. For the whole year in context, see Tomioka's year-round climate.

Daytime high
29°
1st warmest
Overnight low
22°
12th coldest
Rainfall
225 mm
22.1 wet days
Daylight
13 h 24 min
5:07 AM – 6:30 PM
Cloud cover
68%
9th clearest
Wind
5 km/h
12th windiest
Solar energy
4.59 kWh/m²
Travel score
4.1
out of 10

Tomioka is city in Gunma Prefecture, Japan.

Density
390/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

Highs ease over the month, from about 29°C in the first days to 27°C by the end.

A typical August day in Tomioka reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12922
22922
32922
42922
52922
62922
72922
82922
92922
102922
112922
122922
132922
142922
152922
162922
172922
182922
192822
202822
212822
222822
232822
242822
252821
262821
272821
282821
292721
302721
312721

How August really feels in Tomioka

Once humidity and wind are folded in, August averages 7 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
7
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.

Tomioka 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
Jan / -1°688.53.89.81.4
Feb / -0°719.64.110.61.6
Mar12° / 13114.43.311.73.0
Apr17° / 14814.70.412.94.9
May22° / 13°17816013.95.6
Jun24° / 17°23920.7014.44.9
Jul28° / 21°28823.2014.24.2
Aug29° / 22°22522.1013.44.1
Sep25° / 18°25719.8012.25.1
Oct20° / 12°22516.9011.15.3
Nov15° / 859.90.110.14.6
Dec10° / 618.31.19.62.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33862
43961
53961
63862
73961
83961
93961
103961
113763
123763
133664
143664
153664
163664
173565
183565
193565
203565
213565
223565
233466
243466
253466
263565
273565
283664
293565
303565
313466

Chance of precipitation in August

Any precipitation

Tomioka gets around 225 mm of rain over 22.1 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 71% and peaks near 73% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
168
268
368
468
569
669
769
870
970
1071
1171
1272
1372
1472
1573
1673
1773
1873
1973
2073
2173
2273
2372
2472
2572
2672
2773
2873
2973
3073
3173

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 89% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10722692
20622702
30622702
40621712
50621712
60621712
70621712
80621712
90621712
101721692
111722682
121722682
131723672
141724662
151725652
161726642
171826632
181828612
191928602
201930582
2121031552
2221132532
2321133522
2421235492
2521336482
2621337462
2721438442
2821540422
2931541401
3031642381
3131742361

Wind in August

Winds average 5 km/h in August, the calmest month.

Across August, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 54 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 66 minutes over August. Sunrise moves from 4:55 AM to 5:19 AM, and sunset from 6:46 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:556:46
213.84:556:45
313.84:566:45
413.84:576:44
513.74:586:43
613.74:596:42
713.74:596:41
813.75:006:39
913.65:016:38
1013.65:026:37
1113.65:036:36
1213.55:046:35
1313.55:046:34
1413.55:056:33
1513.45:066:31
1613.45:076:30
1713.45:086:29
1813.35:086:28
1913.35:096:26
2013.35:106:25
2113.25:116:24
2213.25:126:22
2313.15:136:21
2413.15:136:20
2513.15:146:18
2613.05:156:17
2713.05:166:16
2813.05:176:14
2912.95:176:13
3012.95:186:11
3112.85:196:10

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.59 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.31 kWh/m² in May across the year — August's 4.59 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
314.1Bright
Planning a trip in August

Hazard calendar for Tomioka

In seasonPeak

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

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

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

Is August a good time to visit Tomioka?

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

4.1
Sightseeing
8th-best month of the year
5.0
Beach & pool
1st-best month of the year

August is a reasonable time to visit Tomioka for sightseeing.

What to pack for Tomioka in August

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

In August, Tomioka sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Tomioka 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 Tomioka peaks around July 18 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highModerateJul 18UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Tomioka 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 Tomioka is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug14Moderate
Sep13Moderate
Oct12Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Tomioka?

Tomioka sits at 36.3°N, 138.9°E, 158 m above sea level, in Japan. The nearest listed city is Yoshii, 8.0 km away.

Topography around Tomioka

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

Within 3 km, the terrain around Tomioka has only modest variations in elevation — a maximum elevation change of 162 m around an average of 178 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,454 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,854 m.

The land around Tomioka is covered by artificial surfaces (41%) and trees (33%) within 3 km, trees (68%) within 16 km, and trees (73%) within 80 km.

3 km
162 m
16 km
1,454 m
80 km
2,854 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Yoshii 8.0 km · Annaka 8.0 km · Takasaki 14 km · Fujioka 16 km · Kanekomachi 20 km · Tamamura 20 km · Kodamachō-kodamaminami 22 km · Ishigami 23 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 Tomioka (36.2541°, 138.8981°, elevation 158 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. 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).