Asan weather in April

In April, Asan sees average daytime highs of 18°C and overnight lows near 7°C, with 71 mm of rain across 7 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 21°C by the end. The sky is clear or mostly clear about 43% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 30 min by month's end. Set against the rest of the year, April is Asan's 4th-clearest and 2nd-windiest month. For the whole year in context, see Asan's year-round climate.

Daytime high
18°
7th warmest
Overnight low
6th coldest
Rainfall
71 mm
7 wet days
Daylight
12 h 54 min
6:04 AM – 7:00 PM
Cloud cover
50%
4th clearest
Wind
10 km/h
2nd windiest
Solar energy
5.52 kWh/m²
Travel score
6.3
out of 10

Asan is city in South Chungcheong Province, South Korea.

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 15°C in the first days to 21°C by the end.

A typical April day in Asan reaches about 18°C in the afternoon and slips back to 7°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 24°C. Set against its neighbours, April runs about 7°C warmer than March and about 6°C cooler than May.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1154
2154
3164
4164
5164
6165
7175
8175
9175
10175
11176
12186
13186
14186
15187
16197
17197
18197
19197
20198
21208
22208
23208
24208
25209
26219
27219
28219
29219
302110

How April really feels in Asan

Once humidity and wind are folded in, April 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

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

Asan weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°214.12.59.80.0
Feb / -3°284.21.710.60.5
Mar11° / 436.11.211.73.3
Apr18° / 717012.96.3
May24° / 13°807.3013.97.3
Jun28° / 18°1218.3014.56.4
Jul29° / 22°25016014.34.5
Aug30° / 22°23415013.44.5
Sep26° / 17°1378.1012.27.0
Oct20° / 10°565.10117.2
Nov12° / 456.20.3103.8
Dec / -3°234.929.50.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
36040
45941
55941
65941
75941
85941
95941
105842
115842
125842
135842
145644
155644
165644
175545
185545
195545
205545
215545
225545
235446
245545
255446
265446
275545
285446
295446
305446

Chance of precipitation in April

Any precipitation

Asan gets around 71 mm of rain over 7 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 23% and peaks near 26% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
119
219
319
420
520
620
721
821
921
1021
1122
1222
1322
1423
1523
1623
1723
1824
1924
2024
2124
2225
2325
2425
2526
2626
2726
2826
2926
3026

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
110000
210000
310000
410000
510000
69910
79910
89910
99910
109910
119910
129910
139910
149820
159820
169820
179820
189820
199730
209730
219631
229541
239541
249451
259451
269262
279262
289172
299082
308983

Wind in April

Winds average 10 km/h in April.

Across April, daily wind ranges from about 10 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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 6:26 AM to 5:46 AM, and sunset from 6:47 PM to 7:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:266:47
212.46:256:48
312.46:236:49
412.56:226:50
512.56:206:51
612.66:196:52
712.66:176:52
812.66:166:53
912.76:146:54
1012.76:136:55
1112.76:116:56
1212.86:106:57
1312.86:086:58
1412.96:076:59
1512.96:057:00
1612.96:047:00
1713.06:037:01
1813.06:017:02
1913.16:007:03
2013.15:597:04
2113.15:577:05
2213.25:567:06
2313.25:557:07
2413.25:537:08
2513.35:527:08
2613.35:517:09
2713.35:497:10
2813.45:487:11
2913.45:477:12
3013.55:467:13

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.52 kWh/m².

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 5.9 kWh/m² in May across the year — April's 5.52 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in April

Hazard calendar for Asan

In seasonPeak

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

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

Asan'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 April a good time to visit Asan?

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

6.3
Sightseeing
5th-best month of the year
2.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Asan for sightseeing.

What to pack for Asan in April

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

In April, Asan sees daytime highs around 18°C and nights near 7°C. Worth packing: a warm layer and sun protection. About 7 days see rain.

a warm layersun protection

Sea temperature near Asan in April

The nearest coast averages about 8°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 51 km away) is warmest in August at about 23°C and coldest in February near 4°C.

It's comfortable for a long swim from Jul 12 to Oct 14 — about 3.1 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan6Bracing
Feb4Bracing
Mar5Bracing
Apr8Bracing
May12Bracing
Jun16Cool
Jul21Refreshing
Aug23Refreshing
Sep23Refreshing
Oct20Cool
Nov15Cool
Dec10Bracing

UV index in Asan in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April 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 Asan peaks around August 13 at about 8 (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 13UV 8Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May6High
Jun7High
Jul8Very high
Aug8Very high
Sep7Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Asan in April

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Asan is worst in March — around 92 µg/m³ PM2.5 (unhealthy), about 2.0× the cleanest month (July, 46 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyMar 1391 µg/m³Jul 2246 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb85Unhealthy
Mar92Unhealthy
Apr75Unhealthy
May62Unhealthy
Jun57Unhealthy
Jul46Poor
Aug47Poor
Sep61Unhealthy
Oct74Unhealthy
Nov79Unhealthy
Dec73Unhealthy
Location & terrain

Where is Asan?

Asan sits at 36.8°N, 127.0°E, 27 m above sea level, in South Korea. The nearest listed city is Cheonan, 13 km away.

AnseongTangjinHongseong

Topography around Asan

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

Within 3 km, the terrain around Asan has only modest variations in elevation — a maximum elevation change of 178 m around an average of 30 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 689 m; within 80 km, large variations in elevation — a maximum elevation change of 1,006 m.

The land around Asan is covered by artificial surfaces (35%), cropland (34%) and trees (21%) within 3 km, trees (47%) and cropland (26%) within 16 km, and trees (49%) and cropland (22%) within 80 km.

3 km
178 m
16 km
689 m
80 km
1,006 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Cheonan 13 km · Seonghwan 19 km · Yesan 19 km · Pyeongtaek 25 km · Sejong 33 km · Anseong 35 km · Tangjin 36 km · Hongseong 36 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 Asan (36.7836°, 127.0042°, elevation 27 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).