| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -6.1° | -16.7° | 58.4mm | 14.7 | 1 |
| February | -5° | -17.6° | 38mm | 12.7 | 5 |
| March | 0.2° | -10.5° | 51.4mm | 13.9 | 2 |
| April | 7.1° | -2.5° | 55.5mm | 10.4 | 31 |
| May | 13.9° | 2.7° | 64.5mm | 10.5 | 59 |
| June | 18° | 7.8° | 68.4mm | 10.4 | 73 |
| July | 21.3° | 12.5° | 90mm | 10.9 | 78 |
| August | 22.5° | 13.7° | 119.4mm | 12.3 | 75 |
| September | 19.7° | 8.7° | 92.3mm | 11.8 | 75 |
| October | 12.4° | 1.8° | 102.4mm | 14.2 | 47 |
| November | 3.7° | -5.1° | 79.9mm | 15.1 | 7 |
| December | -3.5° | -13.2° | 67.4mm | 16.6 | 0 |
January in Yuzhno-Sakhalinsk averages a daily high of -6.1°C with nights around -16.7°C. Expect roughly 14.7 wet days totalling 58.4mm. A hard month to visit for comfort alone.
February in Yuzhno-Sakhalinsk averages a daily high of -5°C with nights around -17.6°C. Expect roughly 12.7 wet days totalling 38mm. A hard month to visit for comfort alone.
March in Yuzhno-Sakhalinsk averages a daily high of 0.2°C with nights around -10.5°C. Expect roughly 13.9 wet days totalling 51.4mm. A hard month to visit for comfort alone.
April in Yuzhno-Sakhalinsk averages a daily high of 7.1°C with nights around -2.5°C. Expect roughly 10.4 wet days totalling 55.5mm. A hard month to visit for comfort alone.
May in Yuzhno-Sakhalinsk averages a daily high of 13.9°C with nights around 2.7°C. Expect roughly 10.5 wet days totalling 64.5mm. Generally workable, with some weather to plan around.
June in Yuzhno-Sakhalinsk averages a daily high of 18°C with nights around 7.8°C. Expect roughly 10.4 wet days totalling 68.4mm. Generally workable, with some weather to plan around.
July in Yuzhno-Sakhalinsk averages a daily high of 21.3°C with nights around 12.5°C. Expect roughly 10.9 wet days totalling 90mm. Comfortable conditions for being outdoors all day.
August in Yuzhno-Sakhalinsk averages a daily high of 22.5°C with nights around 13.7°C. Expect roughly 12.3 wet days totalling 119.4mm. Comfortable conditions for being outdoors all day.
September in Yuzhno-Sakhalinsk averages a daily high of 19.7°C with nights around 8.7°C. Expect roughly 11.8 wet days totalling 92.3mm. Comfortable conditions for being outdoors all day.
October in Yuzhno-Sakhalinsk averages a daily high of 12.4°C with nights around 1.8°C. Expect roughly 14.2 wet days totalling 102.4mm. Demanding conditions — pack for it and plan indoor options.
November in Yuzhno-Sakhalinsk averages a daily high of 3.7°C with nights around -5.1°C. Expect roughly 15.1 wet days totalling 79.9mm. A hard month to visit for comfort alone.
December in Yuzhno-Sakhalinsk averages a daily high of -3.5°C with nights around -13.2°C. Expect roughly 16.6 wet days totalling 67.4mm. 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. Yuzhno-Sakhalinsk peaks at 78.
Based on 30 years of records, June–September scores highest for comfort in Yuzhno-Sakhalinsk, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 22.5°C.
August is the wettest, averaging 119.4mm of rain across roughly 12.3 wet days.
January is the coolest month, with average daily highs around -6.1°C.