Isahaya weather in June

In June, Isahaya sees average daytime highs of 24°C and overnight lows near 21°C, with 444 mm of rain across 16.5 wet days and about 14.1 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 23°C in the first days to 25°C by the end. The sky is clear or mostly clear about 15% of the time in June, and the air most often feels muggy.

Daylight stretches from about 14 hours at the start of June to 14 h 06 min by month's end. Set against the rest of the year, June is Isahaya's 12th-clearest and 12th-windiest month. For the whole year in context, see Isahaya's year-round climate.

Daytime high
24°
4th warmest
Overnight low
21°
9th coldest
Rainfall
444 mm
16.5 wet days
Daylight
14 h 12 min
5:16 AM – 7:25 PM
Cloud cover
78%
12th clearest
Wind
12 km/h
12th windiest
Solar energy
4.5 kWh/m²
Travel score
5.5
out of 10

Isahaya is city in Nagasaki Prefecture, Japan.

Density
422/km²
people per km²
Founded
2005

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

Temperature in June

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 23°C in the first days to 25°C by the end.

A typical June day in Isahaya reaches about 24°C in the afternoon and slips back to 21°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 25°C. Set against its neighbours, June runs about 3°C warmer than May and about 3°C cooler than July.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12219
22319
32319
42319
52319
62319
72319
82320
92320
102320
112320
122320
132320
142420
152420
162421
172421
182421
192421
202421
212421
222421
232421
242422
252422
262522
272522
282522
292522
302522

How June really feels in Isahaya

Once humidity and wind are folded in, June 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

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

Isahaya weather by month

How June compares with the rest of the year at a glance. June is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 8010.80.610.12.1
Feb11° / 97100.410.82.5
Mar13° / 14912011.83.7
Apr17° / 13°16711.4012.85.3
May21° / 17°19710.8013.76.2
Jun24° / 21°44416.5014.15.5
Jul27° / 24°34616.6013.95.3
Aug29° / 25°18513.7013.25.2
Sep26° / 23°20211.9012.26.4
Oct22° / 18°1127.5011.27.3
Nov17° / 13°1069.1010.35.7
Dec12° / 9210.309.93.3

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in June, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of June, with mostly cloudy or overcast conditions the remaining 75%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13862
23763
33664
43565
53466
63367
73367
83169
93070
102971
112773
122773
132674
142575
152575
162377
172179
182179
192179
202080
212080
221981
231882
241882
251882
261783
271981
281981
291981
301981

Chance of precipitation in June

Any precipitation

Isahaya gets around 444 mm of rain over 16.5 wet days in June, the wettest month. 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 72% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
136
237
338
439
540
641
742
843
944
1045
1147
1248
1350
1452
1554
1656
1758
1859
1961
2063
2165
2266
2368
2469
2570
2671
2772
2872
2972
3072

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, June lands in the muggy band about 45% of days. Sticky, muggy-or-worse air turns up on roughly 71% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1417502810
2316493120
3314473420
4213463630
5211443940
6110424250
719404460
818384770
917364980
10163350100
11053153110
12042954130
13042655150
14032456170
15032255200
16032055220
17021855250
18021654280
19021553300
20021351331
21011250361
22011048391
2301946422
2401843452
2501741483
2601639504
2701536535
2801433557
2901431568
3001328599

Wind in June

Winds average 12 km/h in June, the calmest month.

Across June, daily wind ranges from about 11 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1412calm
1512calm
1612calm
1712light breeze
1812light breeze
1912light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in June

DaylightNight

Daylight runs from about 14 hours at the start of June to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over June. Sunrise moves from 5:17 AM to 5:19 AM, and sunset from 7:17 PM to 7:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:177:17
214.05:177:18
314.05:177:19
414.05:177:19
514.15:167:20
614.15:167:20
714.15:167:21
814.15:167:21
914.15:167:22
1014.15:167:22
1114.15:167:23
1214.15:157:23
1314.15:157:23
1414.15:157:24
1514.15:157:24
1614.25:167:25
1714.25:167:25
1814.25:167:25
1914.25:167:26
2014.25:167:26
2114.25:167:26
2214.25:167:26
2314.25:177:27
2414.25:177:27
2514.25:177:27
2614.25:177:27
2714.25:187:27
2814.25:187:27
2914.25:187:27
3014.15:197:27

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 4.5 kWh/m².

For context, solar energy here swings from a low near 2.17 kWh/m² to a high of 5.36 kWh/m² in May across the year — June's 4.5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.2Bright
35.2Bright
45.2Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
94.9Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in June

Hazard calendar for Isahaya

In seasonPeak

In June, Isahaya sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.

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

Isahaya's rainy season runs June–July, when most of the year's rain falls.

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

Is June a good time to visit Isahaya?

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

5.5
Sightseeing
5th-best month of the year
4.6
Beach & pool
5th-best month of the year

June is a reasonable time to visit Isahaya for sightseeing.

What to pack for Isahaya in June

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

In June, Isahaya sees daytime highs around 24°C and nights near 21°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

Sea temperature near Isahaya in June

The nearest coast averages about 22°C in June — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from May 24 to Nov 24 — about 6.1 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec18Cool

UV index in Isahaya in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June 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 Isahaya peaks around July 16 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 16UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Isahaya in June

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where June falls, not just the annual average.

Air quality in Isahaya is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateGoodModerateApr 1324 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May21Moderate
Jun17Moderate
Jul12Good
Aug12Moderate
Sep12Good
Oct11Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Isahaya?

Isahaya sits at 32.8°N, 130.0°E, 104 m above sea level, in Japan. The nearest listed city is Ōmura, 12 km away.

Topography around Isahaya

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

Within 3 km, the terrain around Isahaya has only modest variations in elevation — a maximum elevation change of 166 m around an average of 37 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,042 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,455 m.

The land around Isahaya is covered by artificial surfaces (44%) and trees (39%) within 3 km, trees (46%) and water (33%) within 16 km, and water (50%) and trees (37%) within 80 km.

3 km
166 m
16 km
1,042 m
80 km
1,455 m
treesgrasslandcroplandartificial surfacesbare terrainwater
June weather nearby: Ōmura 12 km · Obita 15 km · Nagasaki 18 km · Togitsu 18 km · Unzen 21 km · Minamishimabara 28 km · Kashima 30 km · Ureshinomachi-shimojuku 31 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 Isahaya (32.8411°, 130.0431°, elevation 104 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).