Wŏnsan weather in September

In September, Wŏnsan sees average daytime highs of 22°C and overnight lows near 18°C, with 151 mm of rain across 9.9 wet days and about 12.3 hours of daylight. It is the 3rd-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 38% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Wŏnsan's 9th-clearest and 10th-windiest month. For the whole year in context, see Wŏnsan's year-round climate.

Daytime high
22°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
151 mm
9.9 wet days
Daylight
12 h 18 min
6:17 AM – 6:32 PM
Cloud cover
55%
9th clearest
Wind
10 km/h
10th windiest
Solar energy
4.08 kWh/m²
Travel score
6.7
out of 10

Wŏnsan is port city and naval base located in Kangwŏn Province, North Korea.

Founded
1800

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

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 Wŏnsan reaches about 22°C in the afternoon and slips back to 18°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°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)
12420
22420
32420
42419
52419
62319
72319
82319
92319
102319
112318
122318
132218
142218
152218
162217
172217
182217
192217
202117
212117
222116
232116
242116
252116
262116
272015
282015
292015
302015

How September really feels in Wŏnsan

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.

Wŏnsan weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°365.24.79.60.0
Feb / -4°334.73.910.50.0
Mar / 426.43.611.71.1
Apr13° / 657.20.8133.9
May18° / 12°1048.3014.16.2
Jun22° / 17°11610014.76.5
Jul25° / 21°25314.6014.56.0
Aug26° / 22°25515.5013.55.8
Sep22° / 18°1519.9012.36.7
Oct17° / 11°777.90115.9
Nov10° / 848.11.29.92.4
Dec / -2°425.23.29.30.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34654
44654
54654
64654
74654
84654
94654
104654
114654
124753
134753
144852
154852
165050
175149
185248
195248
205347
215347
225347
235446
245446
255545
265545
275644
285644
295842
305842

Chance of precipitation in September

Any precipitation

Wŏnsan gets around 151 mm of rain over 9.9 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 34% and peaks near 41% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
141
240
340
439
538
637
736
836
935
1035
1135
1235
1334
1434
1534
1634
1733
1833
1932
2032
2131
2231
2330
2430
2530
2630
2729
2829
2929
3029

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 20% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1211324014
2213343913
3314353712
4315363511
5317373310
641938328
742038307
852238286
962439275
1072639254
1182739233
1292938213
13113038192
14123237171
15143336161
16163535141
17173634121
18193733110
19213831100
2023393080
2125402970
2227402760
2329412650
2431412440
2533412230
2636412120
2738411920
2840411710
2943401610
3045401410

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 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
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 6:03 AM to 6:30 AM, and sunset from 6:57 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:036:57
212.96:046:55
312.86:056:54
412.86:066:52
512.76:076:50
612.76:086:49
712.66:096:47
812.66:106:45
912.66:106:44
1012.56:116:42
1112.56:126:40
1212.46:136:39
1312.46:146:37
1412.36:156:35
1512.36:166:34
1612.36:176:32
1712.26:186:30
1812.26:196:29
1912.16:206:27
2012.16:216:25
2112.06:226:24
2212.06:236:22
2311.96:246:20
2411.96:256:19
2511.96:266:17
2611.86:266:15
2711.86:276:14
2811.76:286:12
2911.76:296:10
3011.66:306:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.08 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 5.77 kWh/m² in May across the year — September's 4.08 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.0Bright
194.0Bright
204.0Bright
214.0Bright
224.0Bright
234.0Bright
244.0Moderate
254.0Moderate
264.0Moderate
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Wŏnsan

In seasonPeak

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

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

Wŏnsan'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 Wŏnsan?

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

6.7
Sightseeing
1st-best month of the year
4.6
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Wŏnsan for sightseeing.

What to pack for Wŏnsan in September

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

In September, Wŏnsan sees daytime highs around 22°C and nights near 18°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Wŏnsan 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 at the nearest coast (about 16 km away) is warmest in August at about 24°C and coldest in February near 4°C.

It's comfortable for a long swim from Jul 1 to Sep 30 — about 3 months when the water holds above 20°C.

0°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan5Bracing
Feb4Bracing
Mar5Bracing
Apr8Bracing
May13Bracing
Jun18Cool
Jul22Refreshing
Aug24Warm
Sep22Refreshing
Oct18Cool
Nov13Bracing
Dec9Bracing

UV index in Wŏnsan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Wŏnsan peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighHighVery highHighModerateLowAug 18UV 8Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar3Moderate
Apr6High
May6High
Jun7Very high
Jul6High
Aug8Very high
Sep7High
Oct5Moderate
Nov2Moderate
Dec2Low

Air quality in Wŏnsan 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 Wŏnsan is worst in March — around 67 µg/m³ PM2.5 (unhealthy), about 2.4× the cleanest month (July, 28 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorMar 1467 µg/m³Jul 2428 µg/m³
PM2.5 (µg/m³)Level
Jan66Unhealthy
Feb63Unhealthy
Mar67Unhealthy
Apr59Unhealthy
May47Poor
Jun36Poor
Jul28Moderate
Aug28Moderate
Sep34Moderate
Oct49Poor
Nov53Poor
Dec52Poor
Location & terrain

Where is Wŏnsan?

Wŏnsan sits at 39.2°N, 127.4°E, 7 m above sea level, in North Korea. The nearest listed city is Anbyŏn-ŭp, 14 km away.

KosanKowŏn-ŭpT’ongch’ŏn-ŭpHoeyangHŭngnamHamhŭngSamho-rodongjagu

Topography around Wŏnsan

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

Within 3 km, the terrain around Wŏnsan has significant variations in elevation — a maximum elevation change of 323 m around an average of 43 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,086 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,626 m.

The land around Wŏnsan is covered by artificial surfaces (38%), trees (26%) and water (24%) within 3 km, water (35%), trees (32%) and cropland (23%) within 16 km, and trees (54%) and water (25%) within 80 km.

3 km
323 m
16 km
1,086 m
80 km
1,626 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Anbyŏn-ŭp 14 km · Kosan 33 km · Kowŏn-ŭp 36 km · T’ongch’ŏn-ŭp 45 km · Hoeyang 51 km · Hŭngnam 78 km · Hamhŭng 85 km · Samho-rodongjagu 96 km

North Korea travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / F
220 V · 50 Hz
Safe drinking water
67%
of population, 2023
Road deaths
24.2
per 100k/yr, 2019
Income group
Low
World Bank

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 Wŏnsan (39.1528°, 127.4436°, elevation 7 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).