| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 8° | — | 37.9mm | 3 | 56 |
| February | 10.2° | — | 17.8mm | 2 | 65 |
| March | 13.8° | — | 57mm | 5 | 70 |
| April | 18.3° | — | 62.6mm | 6 | 83 |
| May | 22.2° | — | 79.2mm | 4 | 92 |
| June | 24.7° | — | 265.4mm | 9 | 82 |
| July | 27.8° | — | 578.9mm | 18 | 67 |
| August | 29.8° | — | 433.3mm | 13 | 63 |
| September | 26.6° | — | 205.1mm | 10 | 80 |
| October | 22.7° | — | — | — | 94 |
| November | 16.5° | — | — | — | 83 |
| December | 10.3° | — | — | — | 63 |
January in Busan averages a daily high of 8°C. Expect roughly 3 wet days totalling 37.9mm. Generally workable, with some weather to plan around.
February in Busan averages a daily high of 10.2°C. Rain is rare — about 2 wet days and 17.8mm across the month. Generally workable, with some weather to plan around.
March in Busan averages a daily high of 13.8°C. Expect roughly 5 wet days totalling 57mm. Generally workable, with some weather to plan around.
April in Busan averages a daily high of 18.3°C. Expect roughly 6 wet days totalling 62.6mm. Comfortable conditions for being outdoors all day.
May in Busan averages a daily high of 22.2°C. Expect roughly 4 wet days totalling 79.2mm. Comfortable conditions for being outdoors all day.
June in Busan averages a daily high of 24.7°C. Expect roughly 9 wet days totalling 265.4mm. Comfortable conditions for being outdoors all day.
July in Busan averages a daily high of 27.8°C. Expect roughly 18 wet days totalling 578.9mm. Generally workable, with some weather to plan around.
August in Busan averages a daily high of 29.8°C. Expect roughly 13 wet days totalling 433.3mm. Generally workable, with some weather to plan around.
September in Busan averages a daily high of 26.6°C. Expect roughly 10 wet days totalling 205.1mm. Comfortable conditions for being outdoors all day.
October in Busan averages a daily high of 22.7°C. Comfortable conditions for being outdoors all day.
November in Busan averages a daily high of 16.5°C. Comfortable conditions for being outdoors all day.
December in Busan averages a daily high of 10.3°C. Generally workable, with some weather to plan around.
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. Busan peaks at 94.
Based on 30 years of records, May scores highest for comfort in Busan, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 29.8°C.
July is the wettest, averaging 578.9mm of rain across roughly 18 wet days.
January is the coolest month, with average daily highs around 8°C.