| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -1.1° | -10.6° | — | — | 24 |
| February | 3° | -7.4° | 3.9mm | 4 | 23 |
| March | 8.8° | -1.3° | 22.7mm | 6 | 47 |
| April | 16.1° | 5.6° | 77.9mm | 11 | 66 |
| May | 22° | 10.8° | — | — | 94 |
| June | 25.9° | 17.2° | 29.2mm | 13 | 74 |
| July | 28.3° | 20.7° | 278.5mm | 15 | 65 |
| August | 29° | 20.4° | 314.3mm | 9 | 74 |
| September | 25.6° | 15° | — | — | 94 |
| October | 18.7° | 7.5° | — | — | 90 |
| November | 8.7° | -0.7° | — | — | 54 |
| December | 0.5° | -8.1° | — | — | 24 |
January in Sinŭiju averages a daily high of -1.1°C with nights around -10.6°C. A hard month to visit for comfort alone.
February in Sinŭiju averages a daily high of 3°C with nights around -7.4°C. Expect roughly 4 wet days totalling 3.9mm. A hard month to visit for comfort alone.
March in Sinŭiju averages a daily high of 8.8°C with nights around -1.3°C. Expect roughly 6 wet days totalling 22.7mm. Demanding conditions — pack for it and plan indoor options.
April in Sinŭiju averages a daily high of 16.1°C with nights around 5.6°C. Expect roughly 11 wet days totalling 77.9mm. Generally workable, with some weather to plan around.
May in Sinŭiju averages a daily high of 22°C with nights around 10.8°C. Comfortable conditions for being outdoors all day.
June in Sinŭiju averages a daily high of 25.9°C with nights around 17.2°C. Expect roughly 13 wet days totalling 29.2mm. Generally workable, with some weather to plan around.
July in Sinŭiju averages a daily high of 28.3°C with nights around 20.7°C. Expect roughly 15 wet days totalling 278.5mm. Generally workable, with some weather to plan around.
August in Sinŭiju averages a daily high of 29°C with nights around 20.4°C. Expect roughly 9 wet days totalling 314.3mm. Generally workable, with some weather to plan around.
September in Sinŭiju averages a daily high of 25.6°C with nights around 15°C. Comfortable conditions for being outdoors all day.
October in Sinŭiju averages a daily high of 18.7°C with nights around 7.5°C. Comfortable conditions for being outdoors all day.
November in Sinŭiju averages a daily high of 8.7°C with nights around -0.7°C. Demanding conditions — pack for it and plan indoor options.
December in Sinŭiju averages a daily high of 0.5°C with nights around -8.1°C. A hard month to visit for comfort alone.
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. Sinŭiju peaks at 94.
Based on 30 years of records, September–October scores highest for comfort in Sinŭiju, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 29°C.
August is the wettest, averaging 314.3mm of rain across roughly 9 wet days.
January is the coolest month, with average daily highs around -1.1°C.