| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 1.8° | — | 3mm | 1 | 43 |
| February | 5.2° | — | 0.8mm | 2 | 49 |
| March | 10.9° | — | 45.7mm | 4 | 63 |
| April | 17.8° | — | 78.8mm | 6 | 81 |
| May | 23.7° | — | 158.4mm | 13 | 74 |
| June | 27.8° | — | 66.6mm | 5 | 87 |
| July | 29.1° | — | 501.2mm | 18 | 62 |
| August | 29.9° | — | 548.5mm | 15.3 | 58 |
| September | 26.3° | — | 253.7mm | 21 | 70 |
| October | 20.3° | — | — | — | 94 |
| November | 12° | — | — | — | 68 |
| December | 3.9° | — | — | — | 42 |
January in Seoul averages a daily high of 1.8°C. Rain is rare — about 1 wet days and 3mm across the month. Demanding conditions — pack for it and plan indoor options.
February in Seoul averages a daily high of 5.2°C. Rain is rare — about 2 wet days and 0.8mm across the month. Demanding conditions — pack for it and plan indoor options.
March in Seoul averages a daily high of 10.9°C. Expect roughly 4 wet days totalling 45.7mm. Generally workable, with some weather to plan around.
April in Seoul averages a daily high of 17.8°C. Expect roughly 6 wet days totalling 78.8mm. Comfortable conditions for being outdoors all day.
May in Seoul averages a daily high of 23.7°C. Expect roughly 13 wet days totalling 158.4mm. Generally workable, with some weather to plan around.
June in Seoul averages a daily high of 27.8°C. Expect roughly 5 wet days totalling 66.6mm. Comfortable conditions for being outdoors all day.
July in Seoul averages a daily high of 29.1°C. Expect roughly 18 wet days totalling 501.2mm. Generally workable, with some weather to plan around.
August in Seoul averages a daily high of 29.9°C. Expect roughly 15.3 wet days totalling 548.5mm. Generally workable, with some weather to plan around.
September in Seoul averages a daily high of 26.3°C. Expect roughly 21 wet days totalling 253.7mm. Generally workable, with some weather to plan around.
October in Seoul averages a daily high of 20.3°C. Comfortable conditions for being outdoors all day.
November in Seoul averages a daily high of 12°C. Generally workable, with some weather to plan around.
December in Seoul averages a daily high of 3.9°C. Demanding conditions — pack for it and plan indoor options.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Seoul peaks at 94.
Based on 30 years of records, June scores highest for comfort in Seoul, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 29.9°C.
August is the wettest, averaging 548.5mm of rain across roughly 15.3 wet days.
January is the coolest month, with average daily highs around 1.8°C.