South Korea · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Seoul are April, May and October, when daytime temperatures are agreeable and rainfall is relatively low.
Seoul sees its warmest weather in August, when daytime highs average around 30°C, and its coolest in January (around 2°C).
Annual precipitation totals roughly 1418mm — July is typically the wettest month (~414mm) and January the driest (~17mm).
A distinctly wetter period runs from June to September — worth planning around if you prefer dry days.
May is the sunniest month, with about 223 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 61 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 2° / -5°C | 17mm | 🤔 Fair |
| February | 5° / -3°C | 28mm | 🤔 Fair |
| March | 11° / 2°C | 37mm | 🤔 Fair |
| April | 18° / 8°C | 73mm | 👍 Good |
| May | 24° / 14°C | 104mm | 🌟 Great |
| June | 28° / 19°C | 130mm | 👍 Good |
| July | 29° / 22°C | 414mm | 🤔 Fair |
| August | 30° / 23°C | 348mm | ⚠️ Challenging |
| September | 26° / 18°C | 142mm | 👍 Good |
| October | 20° / 11°C | 52mm | 🌟 Great |
| November | 12° / 4°C | 51mm | 🤔 Fair |
| December | 4° / -3°C | 23mm | 🤔 Fair |
January in Seoul is cold, with average daytime highs around 2°C (36°F) and nighttime lows near -5°C (22°F). Expect roughly 17mm of precipitation spread over about 3 rainy days, and rain is rare.
☀️ About 170 hours of sunshine over the month (~6h/day).
🎒 What to pack — warm coat · sweaters and layers · scarf
February in Seoul is cold, with average daytime highs around 5°C (41°F) and nighttime lows near -3°C (26°F). Expect roughly 28mm of precipitation spread over about 3 rainy days, with little rainfall.
☀️ About 171 hours of sunshine over the month (~6h/day).
🎒 What to pack — warm coat · sweaters and layers · scarf
March in Seoul is chilly, with average daytime highs around 11°C (52°F) and nighttime lows near 2°C (35°F). Expect roughly 37mm of precipitation spread over about 5 rainy days, with little rainfall.
☀️ About 198 hours of sunshine over the month (~7h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
April in Seoul is mild, with average daytime highs around 18°C (64°F) and nighttime lows near 8°C (46°F). Expect roughly 73mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
☀️ About 206 hours of sunshine over the month (~7h/day).
🎒 What to pack — light jacket · layers for cool evenings
May in Seoul is pleasantly warm, with average daytime highs around 24°C (74°F) and nighttime lows near 14°C (56°F). Expect roughly 104mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
☀️ About 223 hours of sunshine over the month (~7h/day).
🎒 What to pack — light layers · comfortable walking shoes
June in Seoul is warm, with average daytime highs around 28°C (82°F) and nighttime lows near 19°C (66°F). Expect roughly 130mm of precipitation spread over about 8 rainy days, and this is one of the wetter months.
☀️ About 189 hours of sunshine over the month (~6h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
July in Seoul is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 22°C (72°F). Expect roughly 414mm of precipitation spread over about 13 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 124 hours of sunshine over the month (~4h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
August in Seoul is hot, with average daytime highs around 30°C (86°F) and nighttime lows near 23°C (73°F). Expect roughly 348mm of precipitation spread over about 12 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 156 hours of sunshine over the month (~5h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Seoul is warm, with average daytime highs around 26°C (79°F) and nighttime lows near 18°C (64°F). Expect roughly 142mm of precipitation spread over about 7 rainy days, and this is one of the wetter months.
☀️ About 180 hours of sunshine over the month (~6h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
October in Seoul is pleasantly warm, with average daytime highs around 20°C (68°F) and nighttime lows near 11°C (51°F). Expect roughly 52mm of precipitation spread over about 5 rainy days, with little rainfall.
☀️ About 207 hours of sunshine over the month (~7h/day).
🎒 What to pack — light layers · comfortable walking shoes
November in Seoul is chilly, with average daytime highs around 12°C (53°F) and nighttime lows near 4°C (38°F). Expect roughly 51mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 157 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
December in Seoul is cold, with average daytime highs around 4°C (40°F) and nighttime lows near -3°C (26°F). Expect roughly 23mm of precipitation spread over about 4 rainy days, with little rainfall.
☀️ About 163 hours of sunshine over the month (~5h/day).
🎒 What to pack — warm coat · sweaters and layers · scarf