Isehara weather in May

In May, Isehara sees average daytime highs of 21°C and overnight lows near 13°C, with 158 mm of rain across 13.6 wet days and about 13.8 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 22°C by the end. The sky is clear or mostly clear about 21% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of May to 14 h 12 min by month's end. Set against the rest of the year, May is Isehara's 10th-clearest and 3rd-windiest month. For the whole year in context, see Isehara's year-round climate.

Daytime high
21°
5th warmest
Overnight low
13°
7th coldest
Rainfall
158 mm
13.6 wet days
Daylight
13 h 54 min
4:43 AM – 6:35 PM
Cloud cover
71%
10th clearest
Wind
8 km/h
3rd windiest
Solar energy
5.09 kWh/m²
Travel score
5.8
out of 10

Isehara is city in Kanagawa Prefecture, Japan.

Density
1,861/km²
people per km²
Founded
1971

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 22°C by the end.

A typical May day in Isehara reaches about 21°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 25°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
11911
21911
32012
42012
52012
62012
72012
82012
92013
102013
112013
122113
132113
142113
152113
162114
172114
182114
192114
202114
212214
222214
232214
242215
252215
262215
272215
282215
292215
302215
312216

How May really feels in Isehara

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.

Isehara 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 / -0°828.53.39.91.5
Feb / 8410.13.510.71.7
Mar12° / 15415.42.311.72.8
Apr17° / 14714.40.312.94.7
May21° / 13°15813.6013.85.8
Jun24° / 18°20316.4014.35.4
Jul28° / 22°20517.4014.15.0
Aug29° / 23°16116.3013.34.8
Sep25° / 19°22916.1012.25.6
Oct20° / 14°23114.6011.15.6
Nov15° / 11011.7010.14.5
Dec11° / 768.80.59.72.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24060
34060
43961
53862
63763
73565
83565
93466
103367
113268
123169
133268
143169
153169
163169
173070
183070
193268
203169
213268
223169
233169
243268
253169
263169
273169
283169
293169
302971
312872

Chance of precipitation in May

Any precipitation

Isehara gets around 158 mm of rain over 13.6 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 43% and peaks near 45% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
141
241
341
441
541
641
742
842
943
1043
1144
1244
1345
1445
1545
1645
1745
1845
1945
2045
2145
2244
2344
2444
2544
2643
2743
2843
2943
3043
3143

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 52% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1791830
2761941
3752140
4732250
5722350
6692461
7682561
8662671
9652771
10632881
11622981
12603091
13593191
145732101
155633101
165434111
175235121
185136121
194837131
204638151
214439162
224240172
234040182
243841192
253642212
263342222
273143232
282943252
292744273
302544283
312343303

Wind in May

Winds average 8 km/h in May.

Across May, 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.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 24 min at the start of May to 14 h 12 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 4:58 AM to 4:34 AM, and sunset from 6:22 PM to 6:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.44:586:22
213.44:566:23
313.54:556:24
413.54:546:25
513.54:536:26
613.64:526:27
713.64:516:27
813.64:506:28
913.74:496:29
1013.74:486:30
1113.74:476:31
1213.74:476:32
1313.84:466:32
1413.84:456:33
1513.84:446:34
1613.94:436:35
1713.94:426:36
1813.94:426:36
1913.94:416:37
2014.04:406:38
2114.04:406:39
2214.04:396:39
2314.04:386:40
2414.14:386:41
2514.14:376:42
2614.14:376:42
2714.14:366:43
2814.14:366:44
2914.24:356:45
3014.24:356:45
3114.24:346:46

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.09 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.33 kWh/m² to a high of 5.09 kWh/m² in May across the year — May's 5.09 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
315.0Bright
Planning a trip in May

Hazard calendar for Isehara

In seasonPeak

In May, Isehara sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

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

Pacific typhoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Isehara?

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

5.8
Sightseeing
1st-best month of the year
3.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit Isehara for sightseeing.

What to pack for Isehara in May

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

In May, Isehara sees daytime highs around 21°C and nights near 13°C. Worth packing: rain gear and sun protection. About 14 days see rain.

rain gearsun protection

Sea temperature near Isehara in May

The nearest coast averages about 19°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 31 km away) is warmest in August at about 26°C and coldest in February near 15°C.

It's comfortable for a long swim from May 31 to Nov 26 — about 5.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun21Refreshing
Jul24Refreshing
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Isehara in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Isehara peaks around July 20 at about 10 (extreme) — 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 highExtremeVery highHighModerateJul 20UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun9Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Isehara 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 Isehara is worst in April — around 26 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1525 µg/m³Dec 1612 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb25Moderate
Mar23Moderate
Apr26Moderate
May21Moderate
Jun18Moderate
Jul13Moderate
Aug12Moderate
Sep12Moderate
Oct14Moderate
Nov14Moderate
Dec12Good
Location & terrain

Where is Isehara?

Isehara sits at 35.4°N, 139.3°E, 35 m above sea level, in Japan. The nearest listed city is Atsugi, 7.0 km away.

Topography around Isehara

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

Within 3 km, the terrain around Isehara has only modest variations in elevation — a maximum elevation change of 195 m around an average of 39 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,561 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Isehara is covered by artificial surfaces (51%) and trees (25%) within 3 km, trees (42%) and artificial surfaces (36%) within 16 km, and trees (44%), water (29%) and artificial surfaces (21%) within 80 km.

3 km
195 m
16 km
1,561 m
80 km
3,737 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Atsugi 7.0 km · Nihammatsu 8.0 km · Ebina 8.0 km · Hiratsuka 8.0 km · Hadano 8.0 km · Ōiso 9.0 km · Chigasaki 11 km · Ayase 11 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 Isehara (35.3993°, 139.3102°, elevation 35 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).