Seoul Sat 9/26: Clear, 27°C / 18°C, rain chance 30%. A normal September in Seoul: 27°C by day, 19°C at night, rain on about 6.5 days. What to wear: warm — short sleeves, a light layer for air-conditioning.
10-day forecast across Korea
| City | Sat 9/26 | Sun 9/27 | Mon 9/28 | Tue 9/29 | Wed 9/30 | Thu 10/1 | Fri 10/2 | Sat 10/3 | Sun 10/4 | Mon 10/5 |
|---|---|---|---|---|---|---|---|---|---|---|
| Seoul | 27° / 18° Clear · 30% |
27° / 18° Clear · 0% |
27° / 18° Clear · 30% |
27° / 17° Clear · 0% |
24° / 16° Cloudy, rain · 60% |
20° / 12° Clear · 20% |
21° / 9° Clear · 10% |
23° / 10° Clear · 10% |
23° / 10° Mostly cloudy · 20% |
22° / 11° Mostly cloudy · 20% |
| Busan | 25° / 20° Cloudy, rain · 60% |
27° / 20° Clear · 30% |
27° / 21° Cloudy · 30% |
27° / 20° Clear · 30% |
26° / 19° Mostly cloudy · 20% |
24° / 16° Clear · 10% |
23° / 13° Clear · 10% |
23° / 13° Clear · 10% |
25° / 16° Mostly cloudy · 20% |
24° / 15° Mostly cloudy · 20% |
| Gyeongju | 25° / 17° Cloudy, rain · 60% |
29° / 16° Clear · 30% |
29° / 18° Clear · 30% |
28° / 17° Clear · 30% |
28° / 17° Mostly cloudy · 20% |
23° / 15° Clear · 10% |
23° / 10° Clear · 10% |
23° / 11° Clear · 10% |
23° / 12° Mostly cloudy · 20% |
22° / 12° Mostly cloudy · 20% |
| Jeonju | 26° / 18° Cloudy, rain · 60% |
28° / 17° Clear · 30% |
27° / 18° Cloudy · 30% |
26° / 16° Clear · 30% |
26° / 17° Mostly cloudy · 20% |
22° / 13° Clear · 10% |
23° / 11° Clear · 10% |
24° / 10° Clear · 10% |
24° / 13° Mostly cloudy · 20% |
23° / 13° Mostly cloudy · 20% |
| Gangneung | 25° / 17° Clear · 30% |
26° / 16° Clear · 0% |
24° / 16° Mostly cloudy · 30% |
24° / 15° Clear · 10% |
26° / 17° Cloudy · 30% |
22° / 13° Clear · 10% |
21° / 12° Clear · 10% |
21° / 13° Clear · 10% |
22° / 14° Mostly cloudy · 20% |
21° / 13° Mostly cloudy · 20% |
| Jeju City | 28° / 22° Cloudy, rain · 90% |
27° / 22° Cloudy · 30% |
26° / 22° Cloudy · 30% |
26° / 21° Clear · 30% |
26° / 20° Mostly cloudy · 20% |
23° / 19° Clear · 10% |
23° / 17° Clear · 10% |
24° / 17° Clear · 10% |
23° / 18° Mostly cloudy · 30% |
23° / 17° Mostly cloudy · 30% |
| Seogwipo | 27° / 23° Cloudy, rain · 90% |
27° / 23° Cloudy, rain · 60% |
26° / 22° Cloudy · 30% |
27° / 22° Clear · 30% |
25° / 20° Mostly cloudy · 20% |
22° / 17° Clear · 10% |
22° / 16° Clear · 10% |
23° / 16° Clear · 10% |
23° / 17° Mostly cloudy · 30% |
23° / 17° Mostly cloudy · 30% |
High / low °C, sky and chance of rain. Days 1–3 are the KMA short-range forecast, days 4–10 the medium-range forecast issued 09/25 18:00 KST. Beyond three days, read it as a trend.
Also: Seoul weather this week · Air quality today (PM2.5) · Does it snow in Korea?
September across Korea
| City | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Seoul | 27° / 19° | 129 | 6.5 | 0.0 |
| Incheon | 26° / 19° | 123 | 6.1 | 0.0 |
| Busan | 27° / 21° | 229 | 7.9 | 0.0 |
| Gyeongju | 27° / 17° | 189 | 9.3 | — |
| Daegu | 27° / 18° | 136 | 8.0 | 0.0 |
| Jeonju | 28° / 18° | 149 | 7.3 | 0.0 |
| Yeosu | 26° / 21° | 175 | 7.7 | 0.0 |
| Gangneung | 24° / 17° | 234 | 9.7 | 0.0 |
| Daegwallyeong (Pyeongchang) | 21° / 11° | 193 | 11.0 | — |
| Jeju City | 27° / 22° | 243 | 9.5 | 0.0 |
| Seogwipo | 28° / 22° | 274 | 10.2 | 0.0 |
Seoul weather by month
| Month | High / Low °C | Rain mm | Rain days (≥1 mm) | Snow days (≥1 cm) | Humidity % | Sunshine hours | What to wear |
|---|---|---|---|---|---|---|---|
| Jan | 2° / -6° | 17 | 2.9 | 2.0 | 55 | 191 | Cold — winter coat, warm layers |
| Feb | 5° / -3° | 27 | 3.5 | 1.5 | 54 | 187 | Cold — winter coat, warm layers |
| Mar | 13° / 2° | 36 | 4.3 | 0.4 | 53 | 226 | Cool — jacket or coat, layers for cold mornings |
| Apr | 19° / 8° | 77 | 6.7 | 0.0 | 55 | 223 | Mild — long sleeves or a light jacket |
| May | 24° / 14° | 95 | 7.0 | 0.0 | 58 | 252 | Mild — long sleeves or a light jacket |
| Jun | 28° / 19° | 142 | 7.7 | 0.0 | 65 | 217 | Warm — short sleeves, a light layer for air-conditioning |
| Jul | 30° / 23° | 403 | 13.1 | 0.0 | 75 | 147 | Hot — light, breathable clothes, sun protection |
| Aug | 31° / 24° | 260 | 11.5 | 0.0 | 73 | 167 | Hot — light, breathable clothes, sun protection |
| Sep | 27° / 19° | 129 | 6.5 | 0.0 | 66 | 191 | Warm — short sleeves, a light layer for air-conditioning |
| Oct | 21° / 11° | 69 | 4.9 | 0.0 | 63 | 212 | Mild — long sleeves or a light jacket |
| Nov | 13° / 4° | 64 | 6.6 | 0.3 | 61 | 173 | Cool — jacket or coat, layers for cold mornings |
| Dec | 4° / -4° | 28 | 4.5 | 2.3 | 58 | 184 | Cold — winter coat, warm layers |
Averages of daily records at the Seoul weather station, 2011–2025.
Seasons at a glance
Hottest: August (31°C highs). Coldest: January (-6°C lows). Wettest: July (403 mm) — June to September bring 69% of Seoul’s yearly rain, the summer monsoon (jangma) and typhoon season.
Mild and dry: April (19°C, 6.7 rain days), May (24°C, 7.0 rain days), October (21°C, 4.9 rain days) — the months with highs between 17 and 27°C and the fewest rainy days in Seoul.
Snow: Seoul gets about 5.8 days a winter with 1 cm or more of new snow; of the stations that still measure snow, Jeonju gets the most (6.7). Gyeongju measured snow only 2011–2014 (3.5 days a winter then); Daegwallyeong (Pyeongchang) measured snow only 2011–2015 (12.8 days a winter then) — KMA stopped measuring snow depth there, so “—” in the tables. Snow by month →
Other cities, month by month
Incheon — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 2° / -5° | 16 | 2.9 | 1.9 |
| Feb | 4° / -3° | 25 | 3.1 | 1.4 |
| Mar | 11° / 3° | 33 | 3.9 | 0.3 |
| Apr | 16° / 8° | 69 | 5.9 | 0.0 |
| May | 21° / 14° | 87 | 6.1 | 0.0 |
| Jun | 26° / 19° | 108 | 6.3 | 0.0 |
| Jul | 28° / 23° | 320 | 10.9 | 0.0 |
| Aug | 29° / 24° | 239 | 9.5 | 0.0 |
| Sep | 26° / 19° | 123 | 6.1 | 0.0 |
| Oct | 20° / 12° | 60 | 4.9 | 0.0 |
| Nov | 12° / 5° | 63 | 6.2 | 0.3 |
| Dec | 4° / -3° | 29 | 4.8 | 2.0 |
Busan — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 8° / 0° | 34 | 2.7 | 0.1 |
| Feb | 10° / 2° | 51 | 4.7 | 0.1 |
| Mar | 14° / 6° | 100 | 6.9 | 0.0 |
| Apr | 18° / 11° | 138 | 7.1 | 0.0 |
| May | 23° / 15° | 129 | 6.6 | 0.0 |
| Jun | 25° / 19° | 180 | 8.2 | 0.0 |
| Jul | 29° / 23° | 326 | 10.0 | 0.0 |
| Aug | 30° / 25° | 223 | 8.9 | 0.0 |
| Sep | 27° / 21° | 229 | 7.9 | 0.0 |
| Oct | 23° / 15° | 105 | 4.6 | 0.0 |
| Nov | 17° / 9° | 62 | 4.5 | 0.0 |
| Dec | 10° / 2° | 42 | 3.6 | 0.0 |
Gyeongju — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 6° / -5° | 26 | 3.1 | — |
| Feb | 9° / -3° | 29 | 4.3 | — |
| Mar | 15° / 1° | 61 | 5.9 | — |
| Apr | 20° / 6° | 79 | 6.5 | — |
| May | 25° / 12° | 61 | 5.9 | — |
| Jun | 28° / 17° | 100 | 6.9 | — |
| Jul | 31° / 22° | 194 | 9.5 | — |
| Aug | 32° / 22° | 197 | 9.8 | — |
| Sep | 27° / 17° | 189 | 9.3 | — |
| Oct | 22° / 10° | 94 | 5.1 | — |
| Nov | 16° / 3° | 36 | 3.3 | — |
| Dec | 8° / -3° | 29 | 3.0 | — |
Daegu — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 6° / -3° | 15 | 2.5 | 0.5 |
| Feb | 9° / -1° | 24 | 3.3 | 0.2 |
| Mar | 15° / 4° | 55 | 5.4 | 0.2 |
| Apr | 21° / 9° | 72 | 6.4 | 0.0 |
| May | 26° / 14° | 70 | 6.2 | 0.0 |
| Jun | 29° / 19° | 105 | 7.1 | 0.0 |
| Jul | 32° / 23° | 226 | 10.5 | 0.0 |
| Aug | 32° / 24° | 233 | 10.7 | 0.0 |
| Sep | 27° / 18° | 136 | 8.0 | 0.0 |
| Oct | 22° / 11° | 77 | 4.7 | 0.0 |
| Nov | 15° / 5° | 34 | 3.5 | 0.1 |
| Dec | 7° / -2° | 21 | 3.2 | 0.3 |
Jeonju — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 5° / -4° | 27 | 4.9 | 2.2 |
| Feb | 8° / -2° | 33 | 4.3 | 1.4 |
| Mar | 14° / 2° | 59 | 5.8 | 0.2 |
| Apr | 20° / 8° | 73 | 7.3 | 0.0 |
| May | 25° / 13° | 92 | 6.6 | 0.0 |
| Jun | 29° / 19° | 137 | 7.5 | 0.0 |
| Jul | 31° / 23° | 313 | 13.6 | 0.0 |
| Aug | 32° / 24° | 279 | 11.5 | 0.0 |
| Sep | 28° / 18° | 149 | 7.3 | 0.0 |
| Oct | 22° / 11° | 67 | 5.9 | 0.0 |
| Nov | 15° / 5° | 62 | 6.8 | 0.4 |
| Dec | 7° / -2° | 39 | 6.2 | 3.1 |
Yeosu — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 7° / 0° | 26 | 3.1 | 0.1 |
| Feb | 8° / 1° | 54 | 4.4 | 0.1 |
| Mar | 13° / 5° | 91 | 5.7 | 0.0 |
| Apr | 18° / 10° | 128 | 6.7 | 0.0 |
| May | 22° / 15° | 138 | 6.6 | 0.0 |
| Jun | 25° / 20° | 177 | 7.9 | 0.0 |
| Jul | 28° / 23° | 272 | 10.8 | 0.0 |
| Aug | 30° / 25° | 257 | 8.7 | 0.0 |
| Sep | 26° / 21° | 175 | 7.7 | 0.0 |
| Oct | 21° / 15° | 94 | 3.7 | 0.0 |
| Nov | 16° / 9° | 57 | 4.6 | 0.0 |
| Dec | 9° / 2° | 29 | 2.8 | 0.1 |
Gangneung — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 5° / -4° | 38 | 3.4 | 1.8 |
| Feb | 6° / -2° | 56 | 4.2 | 2.8 |
| Mar | 12° / 2° | 63 | 5.9 | 1.8 |
| Apr | 18° / 7° | 82 | 6.7 | 0.1 |
| May | 23° / 13° | 64 | 5.5 | 0.0 |
| Jun | 25° / 17° | 103 | 7.3 | 0.0 |
| Jul | 28° / 21° | 215 | 11.3 | 0.0 |
| Aug | 29° / 22° | 265 | 11.5 | 0.0 |
| Sep | 24° / 17° | 234 | 9.7 | 0.0 |
| Oct | 19° / 11° | 161 | 7.5 | 0.0 |
| Nov | 14° / 5° | 73 | 5.0 | 0.1 |
| Dec | 7° / -2° | 40 | 2.7 | 0.9 |
Daegwallyeong (Pyeongchang) — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | -1° / -12° | 22 | 3.5 | — |
| Feb | 1° / -10° | 35 | 3.8 | — |
| Mar | 7° / -4° | 52 | 6.6 | — |
| Apr | 14° / 1° | 82 | 8.0 | — |
| May | 20° / 7° | 74 | 7.6 | — |
| Jun | 23° / 12° | 134 | 9.3 | — |
| Jul | 25° / 17° | 253 | 13.0 | — |
| Aug | 25° / 17° | 258 | 12.9 | — |
| Sep | 21° / 11° | 193 | 11.0 | — |
| Oct | 15° / 4° | 101 | 7.8 | — |
| Nov | 8° / -2° | 50 | 6.1 | — |
| Dec | 0° / -10° | 29 | 3.4 | — |
Jeju City — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 9° / 4° | 59 | 6.7 | 1.4 |
| Feb | 10° / 4° | 70 | 7.9 | 1.1 |
| Mar | 14° / 7° | 82 | 7.1 | 0.0 |
| Apr | 19° / 12° | 82 | 7.3 | 0.0 |
| May | 23° / 16° | 85 | 6.7 | 0.0 |
| Jun | 26° / 20° | 170 | 8.3 | 0.0 |
| Jul | 30° / 25° | 184 | 7.5 | 0.0 |
| Aug | 31° / 26° | 230 | 8.7 | 0.0 |
| Sep | 27° / 22° | 243 | 9.5 | 0.0 |
| Oct | 22° / 17° | 112 | 5.5 | 0.0 |
| Nov | 17° / 11° | 97 | 7.8 | 0.0 |
| Dec | 11° / 6° | 53 | 7.7 | 0.7 |
Seogwipo — month by month
| Month | High / Low °C | Rain mm | Rain days | Snow days |
|---|---|---|---|---|
| Jan | 11° / 4° | 47 | 5.3 | 0.5 |
| Feb | 12° / 5° | 83 | 7.1 | 0.4 |
| Mar | 15° / 8° | 122 | 7.5 | 0.0 |
| Apr | 19° / 12° | 208 | 8.1 | 0.0 |
| May | 23° / 16° | 246 | 8.3 | 0.0 |
| Jun | 25° / 20° | 309 | 9.5 | 0.0 |
| Jul | 29° / 24° | 221 | 10.0 | 0.0 |
| Aug | 30° / 25° | 275 | 10.4 | 0.0 |
| Sep | 28° / 22° | 274 | 10.2 | 0.0 |
| Oct | 24° / 17° | 107 | 4.9 | 0.0 |
| Nov | 19° / 12° | 102 | 6.8 | 0.0 |
| Dec | 13° / 6° | 50 | 5.7 | 0.7 |
Forecasts and records are from the Korea Meteorological Administration (KMA). Monthly figures are 15-year averages (2011–2025) of each city’s main weather station, not the official 1991–2020 normals, so they can differ slightly from KMA climate tables. “What to wear” is a rule of thumb from the average high only.
Frequently asked questions
What is the weather like in Korea in September?
In Seoul, September averages 27°C by day and 19°C at night, with about 6.5 rainy days and 129 mm of rain. Busan averages 27°C / 21°C and Jeju City 27°C / 22°C.
When is the rainy season in Korea?
The summer monsoon (jangma) and typhoons fall in June to September, which bring 69% of Seoul’s yearly rain. July is the wettest month, with 403 mm on average.
What is the best time to visit Korea for weather?
By the numbers, April, May, October: highs between 17 and 27°C in Seoul and the fewest rainy days of the mild months.
How cold does Korea get in winter?
January is the coldest month in Seoul, with average lows of -6°C and highs of 2°C. Daegwallyeong in the Gangwon mountains averages -12°C lows.
Where does this forecast come from?
The Korea Meteorological Administration, via its public data service. The page refreshes every morning and evening Korea time; the 10-day table updates with each new forecast.
Source: Korea Meteorological Administration — ASOS daily observations (stations 108, 112, 159, 283, 143, 146, 168, 104, 100, 184, 189), short-range and medium-range forecasts (data.go.kr). Updated 2026-09-25 12:01 UTC.