Isesaki weather in August

In August, Isesaki sees average daytime highs of 30°C and overnight lows near 23°C, with 152 mm of rain across 16.1 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 31°C in the first days to 29°C by the end. The sky is clear or mostly clear about 21% 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 Isesaki's 9th-clearest and 11th-windiest month. For the whole year in context, see Isesaki's year-round climate.

Daytime high
30°
1st warmest
Overnight low
23°
12th coldest
Rainfall
152 mm
16.1 wet days
Daylight
13 h 24 min
5:06 AM – 6:29 PM
Cloud cover
67%
9th clearest
Wind
5 km/h
11th windiest
Solar energy
4.48 kWh/m²
Travel score
4.2
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 31°C in the first days to 29°C by the end.

A typical August day in Isesaki reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 34°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)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
242923
252923
262923
272923
282922
292922
302922
312922

How August really feels in Isesaki

Once humidity and wind are folded in, August averages 23 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
23
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.

Isesaki 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 / 546.52.39.81.6
Feb / 537.22.510.62.0
Mar13° / 9911.91.511.73.4
Apr18° / 11111.70.212.95.5
May23° / 14°13212.9013.96.2
Jun25° / 18°17316.4014.45.4
Jul29° / 22°19917.8014.24.4
Aug30° / 23°15216.1013.44.2
Sep26° / 20°19916.1012.25.5
Oct21° / 14°18712.8011.16.0
Nov15° / 697.8010.15.1
Dec11° / 476.60.49.62.9

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
24060
33961
43961
53961
63961
74060
84060
94060
103961
113862
123862
133763
143763
153664
163664
173664
183664
193763
203664
213664
223763
233763
243664
253664
263664
273763
283763
293763
303763
313862

Chance of precipitation in August

Any precipitation

Isesaki gets around 152 mm of rain over 16.1 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 52% and peaks near 56% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
149
249
349
449
549
650
750
850
951
1051
1151
1252
1352
1452
1552
1652
1752
1852
1952
2052
2152
2253
2353
2453
2553
2654
2754
2855
2955
3056
3156

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 92% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
106156712
206156613
306156613
405156713
505156614
605156614
705156614
805156614
905166613
1006166513
1106166513
1206176512
1316186312
1416186411
1516196311
1616206310
171621639
181722619
191723618
201724617
211825597
221826596
231827586
242929555
252930545
2621031534
2721032524
2821133513
2921135493
3021236473
3121237463

Wind in August

Winds average 5 km/h in August.

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 4:53 AM to 5:18 AM, and sunset from 6:45 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:536:45
213.84:546:44
313.84:556:43
413.84:566:42
513.84:566:41
613.74:576:40
713.74:586:39
813.74:596:38
913.65:006:37
1013.65:016:36
1113.65:016:35
1213.55:026:34
1313.55:036:33
1413.55:046:32
1513.45:056:30
1613.45:066:29
1713.45:066:28
1813.35:076:27
1913.35:086:25
2013.35:096:24
2113.25:106:23
2213.25:106:21
2313.15:116:20
2413.15:126:19
2513.15:136:17
2613.05:146:16
2713.05:156:14
2813.05:156:13
2912.95:166:12
3012.95:176:10
3112.85:186:09

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.48 kWh/m².

For context, solar energy here swings from a low near 2.41 kWh/m² to a high of 5.18 kWh/m² in May across the year — August's 4.48 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.7Bright
114.6Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.1Bright
294.0Bright
304.0Bright
314.0Moderate
Planning a trip in August

Is August a good time to visit Isesaki?

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

4.2
Sightseeing
8th-best month of the year
5.8
Beach & pool
1st-best month of the year

August is a reasonable time to visit Isesaki for sightseeing.

What to pack for Isesaki in August

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

In August, Isesaki sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. About 16 days see rain.

light clothesrain gear

UV index in Isesaki 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 Isesaki peaks around July 16 at about 9 (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 16UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Isesaki 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 Isesaki is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Isesaki?

Isesaki sits at 36.3°N, 139.2°E, 62 m above sea level, in Japan. The nearest listed city is Sakai-nakajima, 7.0 km away.

Topography around Isesaki

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

Within 3 km, the terrain around Isesaki has only modest variations in elevation — a maximum elevation change of 44 m around an average of 62 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 409 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,579 m.

The land around Isesaki is covered by artificial surfaces (75%) within 3 km, artificial surfaces (50%) and cropland (32%) within 16 km, and trees (66%) within 80 km.

3 km
44 m
16 km
409 m
80 km
2,579 m
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Sakai-nakajima 7.0 km · Tamamura 8.0 km · Ishigami 9.0 km · Honjō 9.0 km · Fujioka 14 km · Maebashi 14 km · Ōmamachō-ōmama 14 km · Fukayachō 15 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 Isesaki (36.3167°, 139.2°, elevation 62 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).