Seoul weather
World cities · South Korea · 37.57°N 126.98°E
Seoul, in South Korea, has its warmest weather in August, when daytime temperatures average 28.9°C, while January nights are the coldest at around -6.6°C. The city sees roughly 1516mm of rain a year; August is normally the wettest month and December the driest. Figures are averaged from 2020–2024 observations.
Climate averages
| Month | Avg high | Avg low | Rain | Rain days |
|---|---|---|---|---|
| Jan | 2.5° | -6.6° | 28mm | 4 |
| Feb | 5.6° | -4.3° | 28mm | 5 |
| Mar | 12.1° | 0.5° | 53mm | 7 |
| Apr | 17.9° | 6.6° | 58mm | 6 |
| May | 22.2° | 11.6° | 128mm | 9 |
| Jun | 26.9° | 17.8° | 177mm | 12 |
| Jul | 28.8° | 22° | 324mm | 20 |
| Aug | 28.9° | 22.5° | 358mm | 19 |
| Sep | 25.5° | 17.7° | 199mm | 11 |
| Oct | 18.5° | 9.1° | 75mm | 7 |
| Nov | 11.7° | 2.1° | 66mm | 7 |
| Dec | 2.7° | -5.7° | 22mm | 3 |
Seasons in Seoul
Spring (March–May). Daytime highs in Seoul climb from 12.1°C in March to 22.2°C by May, while nights ease from 0.5°C to 11.6°C. The season brings around 239mm of rain in total.
Summer (June–August). The warmest stretch of the year: afternoons average 28.2°C, peaking in August at 28.9°C. June is usually the driest of the summer months (177mm over ~12 rainy days). Around the June solstice, Seoul gets roughly 14.6 hours of daylight.
Autumn (September–November). Daytime temperatures fall from 25.5°C in September to 11.7°C by November, with around 340mm of rain across the season.
Winter (December–February). Nights average -5.5°C, with January the coldest month (average low -6.6°C, daytime high 2.5°C). Expect about 12 days with measurable rain over the three months, and only around 9.4 hours of daylight in mid-December.
How Seoul compares
| Seoul | UK town average | |
|---|---|---|
| Annual rainfall | 1516mm | 1054mm |
| Rainy days per year | 110 | 167 |
| Summer daytime high | 28.2°C | 19.7°C |
| Winter night low | -5.5°C | 3.4°C |
Seoul is about 44% wetter than the average for the 121 UK towns tracked on this site (1054mm), based on 2020–2024 monthly normals.
Seoul weather FAQs
What is the warmest month in Seoul?
August is typically the warmest month in Seoul, with average daytime highs of 28.9°C. Summer afternoons (June–August) average around 28.2°C.
What is the wettest month in Seoul?
August is usually the wettest month, with around 358mm of rain over roughly 19 rainy days. December is typically the driest (22mm).
How much does it rain in Seoul per year?
Seoul receives roughly 1516mm of precipitation per year, spread over about 110 days with at least 1mm of rain (based on 2020–2024 observations).
How cold are winters in Seoul?
Winter nights (December–February) in Seoul average around -5.5°C, with January typically the coldest month (average low -6.6°C).
When is the best time to visit Seoul for good weather?
Late spring and summer offer the most reliable weather in Seoul. June is typically the driest of the warm months (177mm of rain), while August is the warmest, averaging 28.9°C by day — and near the June solstice there are around 15 hours of daylight to enjoy.
How does Seoul's weather compare with the UK?
Seoul receives 1516mm of rain a year, about 44% wetter than the average for the 121 UK towns tracked on this site (1054mm). Summer daytime highs average 28.2°C against a UK-town average of 19.7°C, and winter nights average -5.5°C versus 3.4°C.