Numata weather in August

In August, Numata sees average daytime highs of 25°C and overnight lows near 18°C, with 145 mm of rain across 17.1 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 24°C by the end. The sky is clear or mostly clear about 17% of the time in August, and the air most often feels muggy.

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 Numata's 7th-clearest and 11th-windiest month. For the whole year in context, see Numata's year-round climate.

Daytime high
25°
1st warmest
Overnight low
18°
12th coldest
Rainfall
145 mm
17.1 wet days
Daylight
13 h 24 min
5:06 AM – 6:30 PM
Cloud cover
69%
7th clearest
Wind
4 km/h
11th windiest
Solar energy
4.77 kWh/m²
Travel score
5.6
out of 10

Numata is city in Gunma prefecture, Japan.

Density
106/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 26°C in the first days to 24°C by the end.

A typical August day in Numata reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12619
22619
32619
42619
52619
62619
72619
82619
92619
102619
112619
122619
132619
142619
152619
162518
172518
182518
192518
202518
212518
222518
232518
242518
252518
262518
272418
282418
292417
302417
312417

How August really feels in Numata

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.

Numata weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°11020.621.89.80.0
Feb / -6°9417.418.410.60.0
Mar / -3°12317.914.811.70.3
Apr12° / 11614.94.212.92.7
May17° / 12914.90.313.94.9
Jun21° / 13°15517.1014.55.0
Jul24° / 18°20520.4014.25.0
Aug25° / 18°14517.1013.45.6
Sep21° / 15°17615.8012.25.4
Oct16° / 15313.70.311.14.4
Nov10° / 8513.44.8102.0
Dec / -3°9618.216.69.50.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 66%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23565
33565
43565
53565
63565
73565
83466
93466
103466
113466
123466
133367
143367
153268
163268
173268
183367
193367
203268
213367
223367
233466
243466
253466
263565
273565
283466
293466
303565
313565

Chance of precipitation in August

Any precipitation

Numata gets around 145 mm of rain over 17.1 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 55% and peaks near 57% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
154
254
353
453
553
653
753
853
954
1054
1154
1255
1355
1455
1555
1656
1756
1856
1957
2057
2157
2257
2357
2457
2557
2657
2757
2857
2957
3057
3157

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 56% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
10628642
20627652
30627652
40626662
50626662
60626662
70626662
80626662
90726652
101726642
111727632
121728622
131728622
141729612
151730602
161830592
172831572
182932552
192932552
2021033532
2131034512
2231135492
2331236482
2431237462
2531338441
2631440421
2731541401
2831642381
2931742361
3041843351
3141944331

Wind in August

Winds average 4 km/h in August.

Across August, daily wind ranges from about 4 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
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
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 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 4:53 AM to 5:18 AM, and sunset from 6:47 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:536:47
213.94:546:46
313.84:556:45
413.84:566:44
513.84:566:43
613.74:576:42
713.74:586:41
813.74:596:40
913.65:006:38
1013.65:016:37
1113.65:016:36
1213.55:026:35
1313.55:036:34
1413.55:046:33
1513.45:056:31
1613.45:066:30
1713.45:066:29
1813.35:076:28
1913.35:086:26
2013.35:096:25
2113.25:106:24
2213.25:116:22
2313.25:116:21
2413.15:126:20
2513.15:136:18
2613.05:146:17
2713.05:156:15
2813.05:166:14
2912.95:166:13
3012.95:176:11
3112.95:186:10

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.77 kWh/m².

For context, solar energy here swings from a low near 2.2 kWh/m² to a high of 5.51 kWh/m² in May across the year — August's 4.77 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
114.9Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.7Bright
204.6Bright
214.6Bright
224.6Bright
234.5Bright
244.5Bright
254.5Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
314.3Bright
Planning a trip in August

Is August a good time to visit Numata?

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

5.6
Sightseeing
1st-best month of the year
5.1
Beach & pool
1st-best month of the year

August is a reasonable time to visit Numata for sightseeing.

What to pack for Numata in August

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

In August, Numata sees daytime highs around 25°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

UV index in Numata 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 Numata peaks around July 24 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 24UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5High
Apr7Very high
May9Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Numata 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 Numata is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug13Moderate
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Numata?

Numata sits at 36.6°N, 139.1°E, 376 m above sea level, in Japan. The nearest listed city is Minakami, 8.0 km away.

Topography around Numata

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

Within 3 km, the terrain around Numata has significant variations in elevation — a maximum elevation change of 266 m around an average of 400 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,659 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,544 m.

The land around Numata is covered by artificial surfaces (35%), trees (32%) and cropland (28%) within 3 km, trees (78%) within 16 km, and trees (77%) within 80 km.

3 km
266 m
16 km
1,659 m
80 km
2,544 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Minakami 8.0 km · Shibukawa 17 km · Nakanojō 19 km · Ogura 20 km · Kanekomachi 25 km · Maebashi 26 km · Midori 30 km · Ōmamachō-ōmama 30 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 Numata (36.6333°, 139.05°, elevation 376 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).