Donghae City weather in September

In September, Donghae City sees average daytime highs of 22°C and overnight lows near 16°C, with 185 mm of rain across 11.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Donghae City's 9th-clearest and 10th-windiest month. For the whole year in context, see Donghae City's year-round climate.

Daytime high
22°
4th warmest
Overnight low
16°
9th coldest
Rainfall
185 mm
11.6 wet days
Daylight
12 h 12 min
6:11 AM – 6:25 PM
Cloud cover
63%
9th clearest
Wind
8 km/h
10th windiest
Solar energy
4.12 kWh/m²
Travel score
6.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 20°C by the end.

A typical September day in Donghae City reaches about 22°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12518
22418
32418
42418
52418
62418
72417
82317
92317
102317
112317
122316
132316
142316
152216
162216
172215
182215
192215
202215
212114
222114
232114
242114
252114
262113
272113
282013
292013
302013

How September really feels in Donghae City

Once humidity and wind are folded in, September 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

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

Donghae City weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°455.859.70.0
Feb / -5°445.74.610.60.1
Mar / 688.64.811.72.0
Apr16° / 758.40.812.95.1
May21° / 12°757.80146.7
Jun23° / 16°1079.6014.56.8
Jul26° / 20°19713.4014.35.9
Aug26° / 21°21515.4013.45.7
Sep22° / 16°18511.6012.36.3
Oct18° / 8280116.1
Nov11° / 617.30.7103.1
Dec / -3°3552.79.50.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33565
43763
53763
63664
73763
83763
93862
103961
113961
123961
134060
144060
154258
164258
174357
184357
194456
204555
214555
224555
234555
244555
254654
264654
274654
284753
294753
304852

Chance of precipitation in September

Any precipitation

Donghae City gets around 185 mm of rain over 11.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 48% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
247
346
446
545
645
745
844
944
1043
1143
1242
1342
1441
1540
1639
1739
1838
1937
2036
2135
2234
2333
2433
2532
2631
2731
2831
2930
3030

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 32% 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 (%)
1118373311
2120373210
312138309
422338298
522438287
632638276
742739255
852938244
963038223
1073238213
1193337202
12103436182
13133535171
14153633151
15173632141
16203730130
17223828110
18253827100
1927382590
2030392480
2133392270
2236382060
2338381950
2441381740
2544371630
2647361430
2749351320
2852341220
2954331120
3058311010

Wind in September

Winds average 8 km/h in September.

Across September, 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 September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:58 AM to 6:23 AM, and sunset from 6:49 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:586:49
212.85:596:47
312.86:006:46
412.76:006:44
512.76:016:43
612.66:026:41
712.66:036:39
812.66:046:38
912.56:056:36
1012.56:066:35
1112.46:066:33
1212.46:076:31
1312.46:086:30
1412.36:096:28
1512.36:106:27
1612.26:116:25
1712.26:126:23
1812.26:136:22
1912.16:136:20
2012.16:146:19
2112.06:156:17
2212.06:166:15
2311.96:176:14
2411.96:186:12
2511.96:196:11
2611.86:206:09
2711.86:206:07
2811.76:216:06
2911.76:226:04
3011.76:236:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.12 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 5.97 kWh/m² in May across the year — September's 4.12 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.2Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.0Bright
214.0Bright
224.0Bright
234.0Bright
244.0Bright
254.0Bright
264.0Moderate
274.0Moderate
284.0Moderate
294.0Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Donghae City

In seasonPeak

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

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

Donghae City'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 September a good time to visit Donghae City?

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

6.3
Sightseeing
3rd-best month of the year
4.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Donghae City for sightseeing.

What to pack for Donghae City in September

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

In September, Donghae City sees daytime highs around 22°C and nights near 16°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Donghae City in September

The nearest coast averages about 22°C in September — 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 10°C.

It's comfortable for a long swim from Jul 1 to Oct 11 — about 3.4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb10Bracing
Mar10Bracing
Apr12Bracing
May15Bracing
Jun18Cool
Jul22Refreshing
Aug24Warm
Sep22Refreshing
Oct20Cool
Nov16Cool
Dec14Bracing

UV index in Donghae City in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Donghae City peaks around August 16 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateAug 16UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7High
Jun7High
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Donghae City in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Donghae City is worst in March — around 40 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (September, 17 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 2239 µg/m³Sep 1817 µg/m³
PM2.5 (µg/m³)Level
Jan26Moderate
Feb30Moderate
Mar40Poor
Apr38Poor
May35Moderate
Jun30Moderate
Jul24Moderate
Aug21Moderate
Sep17Moderate
Oct20Moderate
Nov24Moderate
Dec22Moderate
Location & terrain

Where is Donghae City?

Donghae City sits at 37.5°N, 129.1°E, 24 m above sea level, in South Korea. The nearest listed city is Santyoku, 13 km away.

T’aebaekJumunjinPyeongchangNeietsuSokchoYeongju

Topography around Donghae City

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

Within 3 km, the terrain around Donghae City has significant variations in elevation — a maximum elevation change of 358 m around an average of 72 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,347 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,550 m.

The land around Donghae City is covered by trees (47%) and water (30%) within 3 km, water (47%) and trees (44%) within 16 km, and trees (62%) and water (33%) within 80 km.

3 km
358 m
16 km
1,347 m
80 km
1,550 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Santyoku 13 km · Gangneung 31 km · T’aebaek 42 km · Jumunjin 46 km · Pyeongchang 66 km · Neietsu 69 km · Sokcho 86 km · Yeongju 91 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 Donghae City (37.5439°, 129.1069°, elevation 24 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).