| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 2.1° | -5.4° | 14.2mm | 4.6 | 25 |
| February | 5.1° | -3.3° | 16mm | 3.2 | 38 |
| March | 10.1° | 1.7° | 50.6mm | 4.8 | 58 |
| April | 16.4° | 7.4° | 68.4mm | 5.8 | 77 |
| May | 21.8° | 12.3° | 112.4mm | 7.6 | 85 |
| June | 25.8° | 17.5° | 130.8mm | 8.8 | 82 |
| July | 27.9° | 21.3° | 357.6mm | 15.6 | 66 |
| August | 29.2° | 22.6° | 433.4mm | 10.8 | 70 |
| September | 26.1° | 17.4° | 131.9mm | 8.8 | 82 |
| October | 20.2° | 10.6° | 46.8mm | 5 | 90 |
| November | 12.1° | 3.5° | 50.4mm | 7 | 61 |
| December | 4.2° | -2.5° | 14mm | 3 | 37 |
January in Gimpo-si averages a daily high of 2.1°C with nights around -5.4°C. Expect roughly 4.6 wet days totalling 14.2mm. A hard month to visit for comfort alone.
February in Gimpo-si averages a daily high of 5.1°C with nights around -3.3°C. Expect roughly 3.2 wet days totalling 16mm. Demanding conditions — pack for it and plan indoor options.
March in Gimpo-si averages a daily high of 10.1°C with nights around 1.7°C. Expect roughly 4.8 wet days totalling 50.6mm. Generally workable, with some weather to plan around.
April in Gimpo-si averages a daily high of 16.4°C with nights around 7.4°C. Expect roughly 5.8 wet days totalling 68.4mm. Comfortable conditions for being outdoors all day.
May in Gimpo-si averages a daily high of 21.8°C with nights around 12.3°C. Expect roughly 7.6 wet days totalling 112.4mm. Comfortable conditions for being outdoors all day.
June in Gimpo-si averages a daily high of 25.8°C with nights around 17.5°C. Expect roughly 8.8 wet days totalling 130.8mm. Comfortable conditions for being outdoors all day.
July in Gimpo-si averages a daily high of 27.9°C with nights around 21.3°C. Expect roughly 15.6 wet days totalling 357.6mm. Generally workable, with some weather to plan around.
August in Gimpo-si averages a daily high of 29.2°C with nights around 22.6°C. Expect roughly 10.8 wet days totalling 433.4mm. Generally workable, with some weather to plan around.
September in Gimpo-si averages a daily high of 26.1°C with nights around 17.4°C. Expect roughly 8.8 wet days totalling 131.9mm. Comfortable conditions for being outdoors all day.
October in Gimpo-si averages a daily high of 20.2°C with nights around 10.6°C. Expect roughly 5 wet days totalling 46.8mm. Comfortable conditions for being outdoors all day.
November in Gimpo-si averages a daily high of 12.1°C with nights around 3.5°C. Expect roughly 7 wet days totalling 50.4mm. Generally workable, with some weather to plan around.
December in Gimpo-si averages a daily high of 4.2°C with nights around -2.5°C. Expect roughly 3 wet days totalling 14mm. 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. Gimpo-si peaks at 90.
Based on 30 years of records, May–June scores highest for comfort in Gimpo-si, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 29.2°C.
August is the wettest, averaging 433.4mm of rain across roughly 10.8 wet days.
January is the coolest month, with average daily highs around 2.1°C.