Jumunjin weather in May

In May, Jumunjin sees average daytime highs of 20°C and overnight lows near 12°C, with 78 mm of rain across 7.7 wet days and about 14 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 22°C by the end. The sky is clear or mostly clear about 37% 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 24 min by month's end. Set against the rest of the year, May is Jumunjin's 8th-clearest and 7th-windiest month. For the whole year in context, see Jumunjin's year-round climate.

Daytime high
20°
5th warmest
Overnight low
12°
8th coldest
Rainfall
78 mm
7.7 wet days
Daylight
14 hours
5:20 AM – 7:22 PM
Cloud cover
55%
8th clearest
Wind
10 km/h
7th windiest
Solar energy
5.9 kWh/m²
Travel score
6.7
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 18°C in the first days to 22°C by the end.

A typical May day in Jumunjin reaches about 20°C in the afternoon and slips back to 12°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 25°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)
11810
21810
31810
41810
51911
61911
71911
81911
91911
101911
111912
121912
132012
142012
152012
162012
172013
182013
192013
202113
212113
222113
232113
242114
252114
262114
272114
282214
292214
302214
312215

How May really feels in Jumunjin

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.

Jumunjin weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°4465.19.70.0
Feb / -4°425.64.710.50.1
Mar / 598.14.411.72.0
Apr15° / 707.70.9134.9
May20° / 12°787.70146.7
Jun23° / 17°989.7014.66.7
Jul26° / 21°20014.2014.45.9
Aug26° / 21°20515.6013.55.7
Sep23° / 16°16611.1012.36.5
Oct18° / 10°767.80116.2
Nov11° / 637.71.4103.2
Dec / -2°375.22.99.40.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% 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 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25248
35149
45149
55050
64951
74951
84852
94852
104951
115050
124951
135050
145050
155050
165149
175149
185248
195248
205248
215347
225347
235347
245446
255446
265347
275347
285248
295149
305149
315050

Chance of precipitation in May

Any precipitation

Jumunjin gets around 78 mm of rain over 7.7 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 25% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
125
226
326
426
526
627
727
827
927
1027
1128
1228
1328
1428
1527
1627
1727
1826
1926
2025
2125
2224
2324
2423
2523
2622
2722
2822
2922
3022
3122

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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19541
29451
39550
49460
59460
69370
79370
89370
99280
109280
119280
129190
139190
1490100
1589101
1688111
1787121
1886131
1984151
2082162
2181172
2279192
2378202
2475223
2573243
2670264
2768284
2864315
2961336
3058357
3155378

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
299calm
309calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 5:35 AM to 5:10 AM, and sunset from 7:08 PM to 7:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:357:08
213.65:347:09
313.65:337:10
413.75:327:11
513.75:317:12
613.75:307:13
713.85:297:14
813.85:277:15
913.85:267:16
1013.95:257:17
1113.95:247:18
1213.95:237:19
1313.95:227:19
1414.05:227:20
1514.05:217:21
1614.05:207:22
1714.15:197:23
1814.15:187:24
1914.15:177:25
2014.25:177:26
2114.25:167:26
2214.25:157:27
2314.25:147:28
2414.35:147:29
2514.35:137:30
2614.35:127:31
2714.35:127:31
2814.35:117:32
2914.45:117:33
3014.45:107:34
3114.45:107:34

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.9 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 5.9 kWh/m² in May across the year — May's 5.9 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
206.0Bright
216.0Bright
226.0Intense
236.0Intense
246.1Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.2Intense
316.2Intense
Planning a trip in May

Hazard calendar for Jumunjin

In seasonPeak

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

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

Jumunjin's rainy season runs June–September, 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 May a good time to visit Jumunjin?

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

6.7
Sightseeing
1st-best month of the year
3.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit Jumunjin for sightseeing.

What to pack for Jumunjin in May

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

In May, Jumunjin sees daytime highs around 20°C and nights near 12°C. Worth packing: sun protection. About 8 days see rain.

sun protection

Sea temperature near Jumunjin in May

The nearest coast averages about 14°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 24°C and coldest in February near 9°C.

It's comfortable for a long swim from Jul 1 to Oct 7 — about 3.3 months when the water holds above 20°C.

5°10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan10Bracing
Feb9Bracing
Mar9Bracing
Apr12Bracing
May14Bracing
Jun18Cool
Jul22Refreshing
Aug24Warm
Sep22Refreshing
Oct19Cool
Nov16Cool
Dec13Bracing

UV index in Jumunjin in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jumunjin peaks around August 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateLowAug 16UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May6High
Jun8Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Jumunjin 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 Jumunjin is worst in March — around 36 µg/m³ PM2.5 (poor), about 2.8× the cleanest month (September, 13 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateMar 2136 µg/m³Sep 1513 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb28Moderate
Mar36Poor
Apr34Moderate
May29Moderate
Jun21Moderate
Jul18Moderate
Aug16Moderate
Sep13Moderate
Oct17Moderate
Nov21Moderate
Dec19Moderate
Location & terrain

Where is Jumunjin?

Jumunjin sits at 37.9°N, 128.8°E, 9 m above sea level, in South Korea. The nearest listed city is Gangneung, 16 km away.

SokchoDonghae CitySantyokuKosongPyeongchangYangguT’aebaek

Topography around Jumunjin

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

Within 3 km, the terrain around Jumunjin has only modest variations in elevation — a maximum elevation change of 96 m around an average of 12 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,006 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,646 m.

The land around Jumunjin is covered by water (43%) and trees (30%) within 3 km, water (49%) and trees (43%) within 16 km, and trees (64%) and water (31%) within 80 km.

3 km
96 m
16 km
1,006 m
80 km
1,646 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Gangneung 16 km · Sokcho 41 km · Donghae City 46 km · Santyoku 59 km · Kosong 63 km · Pyeongchang 69 km · Yanggu 77 km · T’aebaek 81 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 Jumunjin (37.8914°, 128.8258°, elevation 9 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).