Koesan weather in June

In June, Koesan sees average daytime highs of 27°C and overnight lows near 17°C, with 125 mm of rain across 8.8 wet days and about 14.5 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 24% of the time in June, and the air most often feels comfortable.

Daylight stretches from about 14 h 18 min at the start of June to 14 h 30 min by month's end. Set against the rest of the year, June is Koesan's 10th-clearest and 11th-windiest month. For the whole year in context, see Koesan's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
125 mm
8.8 wet days
Daylight
14 h 30 min
5:14 AM – 7:44 PM
Cloud cover
66%
10th clearest
Wind
8 km/h
11th windiest
Solar energy
5.56 kWh/m²
Travel score
6.5
out of 10

Temperature in June

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical June day in Koesan reaches about 27°C in the afternoon and slips back to 17°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 31°C. Set against its neighbours, June runs about 4°C warmer than May and about 2°C cooler than July.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12615
22615
32615
42615
52615
62616
72616
82716
92716
102716
112717
122717
132717
142717
152717
162717
172718
182718
192718
202718
212718
222718
232718
242719
252719
262719
272719
282719
292719
302720

How June really feels in Koesan

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.

Koesan weather by month

How June compares with the rest of the year at a glance. June is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°234.73.39.80.0
Feb / -4°334.62.110.60.4
Mar11° / 547.12.111.73.0
Apr18° / 837.70.212.96.1
May23° / 12°948013.97.1
Jun27° / 17°1258.8014.56.5
Jul28° / 21°25816.7014.34.8
Aug29° / 22°21915.5013.44.8
Sep25° / 16°1398.9012.26.9
Oct19° / 585.20117.0
Nov12° / 446.60.4103.4
Dec / -4°264.62.19.50.2

Cloud cover in June

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in June.

Beyond those clear spells, partly cloudy skies cover about 14% of June, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24753
34753
44654
54555
64456
74456
84456
94258
104258
114258
124159
134159
144060
153961
163961
173862
183862
193763
203565
213466
223367
233268
243268
253070
263070
272971
282872
292773
302674

Chance of precipitation in June

Any precipitation

Koesan gets around 125 mm of rain over 8.8 wet days in June. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 47% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
121
221
321
422
522
623
723
824
924
1025
1125
1226
1326
1427
1528
1629
1729
1830
1931
2032
2133
2235
2336
2438
2540
2642
2743
2845
2946
3047

Humidity in June

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, June lands in the comfortable band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
155321210
253331310
351341410
447361520
545371620
642381730
739391930
836402040
933412140
1030412350
1128412560
1225412770
1323412980
1421403090
15193832100
16183734111
17163536121
18153337141
19133238151
20123039172
21102840193
2292641214
2382341235
2472140256
2561940278
26518392910
27416383111
28414373213
29313353415
30312343517

Wind in June

Winds average 8 km/h in June.

Across June, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in June

DaylightNight

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

Days grow by about 12 minutes over June. Sunrise moves from 5:16 AM to 5:17 AM, and sunset from 7:36 PM to 7:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
114.35:167:36
214.35:167:37
314.45:167:38
414.45:157:38
514.45:157:39
614.45:157:39
714.45:157:40
814.45:147:41
914.45:147:41
1014.55:147:42
1114.55:147:42
1214.55:147:43
1314.55:147:43
1414.55:147:43
1514.55:147:44
1614.55:147:44
1714.55:147:45
1814.55:147:45
1914.55:147:45
2014.55:147:46
2114.55:147:46
2214.55:157:46
2314.55:157:46
2414.55:157:46
2514.55:157:47
2614.55:167:47
2714.55:167:47
2814.55:167:47
2914.55:177:47
3014.55:177:47

Solar energy in June

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in June, about 5.56 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.83 kWh/m² in May across the year — June's 5.56 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Intense
46.0Intense
56.0Intense
66.0Bright
76.0Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
125.8Bright
135.8Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.5Bright
195.5Bright
205.4Bright
215.3Bright
225.2Bright
235.1Bright
245.0Bright
255.0Bright
264.9Bright
274.8Bright
284.7Bright
294.7Bright
304.6Bright
Planning a trip in June

Hazard calendar for Koesan

In seasonPeak

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

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

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

Is June a good time to visit Koesan?

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

6.5
Sightseeing
4th-best month of the year
6.5
Beach & pool
1st-best month of the year

June is a reasonable time to visit Koesan for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Koesan in June

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

In June, Koesan sees daytime highs around 27°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Koesan in June

LowModerateHighVery highExtreme

Clear-sky midday UV in June peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Koesan peaks around August 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateAug 14UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun7Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Koesan 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 Koesan is worst in March — around 80 µg/m³ PM2.5 (unhealthy), about 1.8× the cleanest month (July, 45 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyMar 1479 µg/m³Jul 2345 µg/m³
PM2.5 (µg/m³)Level
Jan69Unhealthy
Feb72Unhealthy
Mar80Unhealthy
Apr65Unhealthy
May58Unhealthy
Jun54Poor
Jul45Poor
Aug45Poor
Sep56Unhealthy
Oct67Unhealthy
Nov72Unhealthy
Dec65Unhealthy
Location & terrain

Where is Koesan?

Koesan sits at 36.8°N, 127.8°E, 116 m above sea level, in South Korea. The nearest listed city is Jungpyong, 19 km away.

MungyeongSejongAnseongSangju

Topography around Koesan

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

Within 3 km, the terrain around Koesan has significant variations in elevation — a maximum elevation change of 298 m around an average of 173 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 866 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,408 m.

The land around Koesan is covered by trees (58%) within 3 km, trees (74%) within 16 km, and trees (72%) within 80 km.

3 km
298 m
16 km
866 m
80 km
1,408 m
treesgrasslandcroplandartificial surfacesbare terrainwater
June weather nearby: Jungpyong 19 km · Chungju 22 km · Chinch'ŏn 32 km · Cheongju-si 33 km · Mungyeong 43 km · Sejong 51 km · Anseong 52 km · Sangju 55 km

South Korea travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
220 V · 60 Hz
Prices
≈ 57% of US
price level, 2025
GDP per capita
$36,227
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.5
per 100k, 2023
Road deaths
8.6
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 522
Religion
none 60%Protestant 17%Buddhist 16%Catholic 6%

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 Koesan (36.8108°, 127.7947°, elevation 116 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).