Unzen weather in June

In June, Unzen sees average daytime highs of 27°C and overnight lows near 21°C, with 429 mm of rain across 17 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 26°C in the first days to 28°C by the end. The sky is clear or mostly clear about 12% 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 Unzen's 12th-clearest and 11th-windiest month. For the whole year in context, see Unzen's year-round climate.

Daytime high
27°
4th warmest
Overnight low
21°
9th coldest
Rainfall
429 mm
17 wet days
Daylight
14 h 06 min
5:15 AM – 7:24 PM
Cloud cover
81%
12th clearest
Wind
8 km/h
11th windiest
Solar energy
4.35 kWh/m²
Travel score
5.2
out of 10

Temperature in June

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 26°C in the first days to 28°C by the end.

A typical June day in Unzen reaches about 27°C in the afternoon and slips back to 21°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, June runs about 3°C warmer than May and about 4°C cooler than July.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12618
22618
32619
42619
52619
62619
72619
82619
92620
102620
112620
122620
132620
142620
152620
162721
172721
182721
192721
202721
212721
222721
232722
242722
252722
262722
272722
282822
292823
302823

How June really feels in Unzen

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.

Unzen 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 daysDaylight (hours)Travel score
Jan11° / 707.710.12.7
Feb12° / 88910.83.2
Mar15° / 13411.611.84.6
Apr20° / 12°15110.912.86.1
May24° / 16°18211.113.76.6
Jun27° / 21°4291714.15.2
Jul30° / 24°34818.513.93.7
Aug32° / 25°17914.513.23.5
Sep29° / 22°20312.412.25.3
Oct24° / 17°1127.911.27.3
Nov18° / 12°1028.410.36.2
Dec13° / 817.69.93.9

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in June, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 9% of June, with mostly cloudy or overcast conditions the remaining 79%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23367
33169
43169
53070
62872
72773
82773
92575
102476
112377
122278
132179
142080
151981
161882
171882
181783
191684
201684
211684
221585
231486
241486
251486
261486
271486
281486
291486
301486

Chance of precipitation in June

Any precipitation

Unzen gets around 429 mm of rain over 17 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 57% and peaks near 75% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
138
239
339
440
541
642
743
844
945
1047
1148
1250
1352
1454
1556
1658
1760
1862
1963
2065
2167
2268
2370
2471
2573
2674
2774
2875
2975
3075

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 37% of days. Sticky, muggy-or-worse air turns up on roughly 66% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1925392430
2823402640
3722392740
4620392960
5518393170
6417383280
7415383491
83133735111
93123637121
102103538141
11293340151
12183241171
13173042182
14162843202
15152644223
16142444243
17042244254
18032044275
19031844296
20031643307
21021542329
220213413410
230211403512
24029393713
25028373915
26016354117
27015334218
28014314420
29014294522
30013274624

Wind in June

Winds average 8 km/h in June.

Across June, daily wind ranges from about 7 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
2710calm
2810calm
2910calm
3010calm

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 5:18 AM, and sunset from 7:16 PM to 7:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:177:16
214.05:167:17
314.05:167:18
414.05:167:18
514.05:167:19
614.15:157:19
714.15:157:20
814.15:157:20
914.15:157:21
1014.15:157:21
1114.15:157:22
1214.15:157:22
1314.15:157:22
1414.15:157:23
1514.15:157:23
1614.15:157:24
1714.15:157:24
1814.25:157:24
1914.25:157:25
2014.25:157:25
2114.25:157:25
2214.25:167:25
2314.25:167:26
2414.25:167:26
2514.25:167:26
2614.25:177:26
2714.25:177:26
2814.15:177:26
2914.15:187:26
3014.15:187:26

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 4.35 kWh/m².

For context, solar energy here swings from a low near 2.2 kWh/m² to a high of 5.28 kWh/m² in May across the year — June's 4.35 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.7Bright
114.6Bright
124.6Bright
134.5Bright
144.5Bright
154.4Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.1Bright
214.0Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in June

Hazard calendar for Unzen

In seasonPeak

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

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

Unzen'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 Unzen?

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

5.2
Sightseeing
6th-best month of the year
5.2
Beach & pool
6th-best month of the year

June is a reasonable time to visit Unzen for sightseeing.

What to pack for Unzen in June

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

In June, Unzen sees daytime highs around 27°C and nights near 21°C. Pack rain gear. Worth having: light clothes. About 17 days see rain.

rain gearlight clothes

Sea temperature near Unzen 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 17 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from May 27 to Nov 14 — about 5.7 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Cool
Dec17Cool

UV index in Unzen in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June 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 Unzen peaks around July 13 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 13UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Unzen 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 Unzen is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (July, 13 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2325 µg/m³Jul 2114 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar25Moderate
Apr25Moderate
May23Moderate
Jun19Moderate
Jul13Moderate
Aug15Moderate
Sep14Moderate
Oct14Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Unzen?

Unzen sits at 32.8°N, 130.2°E, 546 m above sea level, in Japan. The nearest listed city is Minamishimabara, 11 km away.

Topography around Unzen

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

Within 3 km, the terrain around Unzen has large variations in elevation — a maximum elevation change of 954 m around an average of 559 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,450 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,724 m.

The land around Unzen is covered by trees (96%) within 3 km, water (42%) and trees (37%) within 16 km, and trees (46%) and water (39%) within 80 km.

3 km
954 m
16 km
1,450 m
80 km
1,724 m
treesgrasslandcroplandartificial surfaceswater
June weather nearby: Minamishimabara 11 km · Shimabara 11 km · Isahaya 21 km · Nagasu 26 km · Ōyanomachi-noboritate 26 km · Arao 30 km · Ōmura 32 km · Nagasaki 34 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 Unzen (32.7711°, 130.2484°, elevation 546 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).