Isesaki weather in May

In May, Isesaki sees average daytime highs of 23°C and overnight lows near 14°C, with 132 mm of rain across 12.9 wet days and about 13.9 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 21°C in the first days to 24°C by the end. The sky is clear or mostly clear about 26% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of May to 14 h 18 min by month's end. Set against the rest of the year, May is Isesaki's 8th-clearest and 6th-windiest month. For the whole year in context, see Isesaki's year-round climate.

Daytime high
23°
5th warmest
Overnight low
14°
8th coldest
Rainfall
132 mm
12.9 wet days
Daylight
13 h 54 min
4:42 AM – 6:37 PM
Cloud cover
66%
8th clearest
Wind
6 km/h
6th windiest
Solar energy
5.18 kWh/m²
Travel score
6.2
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 21°C in the first days to 24°C by the end.

A typical May day in Isesaki reaches about 23°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 27°C. Set against its neighbours, May runs about 5°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12111
22112
32112
42112
52112
62112
72212
82213
92213
102213
112213
122213
132213
142214
152214
162314
172314
182314
192314
202314
212315
222315
232315
242415
252415
262415
272415
282416
292416
302416
312416

How May really feels in Isesaki

Once humidity and wind are folded in, May 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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Isesaki weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 6th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24654
34654
44555
54357
64357
74258
84159
94060
103961
114060
124060
133961
143961
153961
163961
173961
183961
194060
204060
214060
223961
233862
243862
253763
263862
273763
283664
293565
303565
313367

Chance of precipitation in May

Any precipitation

Isesaki gets around 132 mm of rain over 12.9 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 43% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
338
438
539
639
740
840
941
1042
1142
1242
1343
1443
1543
1643
1743
1843
1943
2043
2142
2242
2342
2441
2541
2640
2740
2840
2939
3040
3140

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1831520
2821620
3811720
4791920
5782020
6762130
7742231
8732331
9722341
10712441
11712441
12692551
13692551
14682561
15662671
16652771
17642781
18622891
196029101
205830111
215631121
225432131
235233141
245033152
254834162
264635172
274336182
284137202
293938212
303638233
313439243

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over May. Sunrise moves from 4:57 AM to 4:33 AM, and sunset from 6:24 PM to 6:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:576:24
213.54:556:25
313.54:546:26
413.64:536:27
513.64:526:28
613.64:516:29
713.74:506:29
813.74:496:30
913.74:486:31
1013.84:476:32
1113.84:466:33
1213.84:456:34
1313.84:446:35
1413.94:436:35
1513.94:436:36
1613.94:426:37
1714.04:416:38
1814.04:406:39
1914.04:396:40
2014.04:396:40
2114.14:386:41
2214.14:376:42
2314.14:376:43
2414.14:366:44
2514.14:356:44
2614.24:356:45
2714.24:346:46
2814.24:346:47
2914.24:336:47
3014.24:336:48
3114.34:336:49

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.18 kWh/m² — the sunniest month for solar.

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 — May's 5.18 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.1Bright
315.1Bright
Planning a trip in May

Is May a good time to visit Isesaki?

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

6.2
Sightseeing
1st-best month of the year
4.6
Beach & pool
5th-best month of the year

May is a reasonable time to visit Isesaki for sightseeing.

What to pack for Isesaki in May

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

In May, Isesaki sees daytime highs around 23°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Isesaki in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).