| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -0.5° | — | 34.1mm | 6.4 | 32 |
| February | -0.4° | — | 26.6mm | 6.1 | 33 |
| March | 3.2° | — | 60.4mm | 8.9 | 28 |
| April | 8.2° | — | 84.6mm | 11.5 | 39 |
| May | 13.4° | — | 132.2mm | 11.9 | 55 |
| June | 16° | — | 123.5mm | 11.9 | 63 |
| July | 19.7° | — | 131.9mm | 12.6 | 74 |
| August | 21.5° | — | 137.9mm | 12.4 | 75 |
| September | 20.2° | — | 127.4mm | 10.9 | 78 |
| October | 15.1° | — | 110.3mm | 8.6 | 67 |
| November | 8.6° | — | 71.4mm | 8.9 | 46 |
| December | 2.2° | — | 73.9mm | 7.9 | 29 |
January in Kushiro averages a daily high of -0.5°C. Expect roughly 6.4 wet days totalling 34.1mm. A hard month to visit for comfort alone.
February in Kushiro averages a daily high of -0.4°C. Expect roughly 6.1 wet days totalling 26.6mm. A hard month to visit for comfort alone.
March in Kushiro averages a daily high of 3.2°C. Expect roughly 8.9 wet days totalling 60.4mm. A hard month to visit for comfort alone.
April in Kushiro averages a daily high of 8.2°C. Expect roughly 11.5 wet days totalling 84.6mm. Demanding conditions — pack for it and plan indoor options.
May in Kushiro averages a daily high of 13.4°C. Expect roughly 11.9 wet days totalling 132.2mm. Generally workable, with some weather to plan around.
June in Kushiro averages a daily high of 16°C. Expect roughly 11.9 wet days totalling 123.5mm. Generally workable, with some weather to plan around.
July in Kushiro averages a daily high of 19.7°C. Expect roughly 12.6 wet days totalling 131.9mm. Generally workable, with some weather to plan around.
August in Kushiro averages a daily high of 21.5°C. Expect roughly 12.4 wet days totalling 137.9mm. Comfortable conditions for being outdoors all day.
September in Kushiro averages a daily high of 20.2°C. Expect roughly 10.9 wet days totalling 127.4mm. Comfortable conditions for being outdoors all day.
October in Kushiro averages a daily high of 15.1°C. Expect roughly 8.6 wet days totalling 110.3mm. Generally workable, with some weather to plan around.
November in Kushiro averages a daily high of 8.6°C. Expect roughly 8.9 wet days totalling 71.4mm. Demanding conditions — pack for it and plan indoor options.
December in Kushiro averages a daily high of 2.2°C. Expect roughly 7.9 wet days totalling 73.9mm. 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. Kushiro peaks at 78.
Based on 30 years of records, July–September scores highest for comfort in Kushiro, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 21.5°C.
August is the wettest, averaging 137.9mm of rain across roughly 12.4 wet days.
January is the coolest month, with average daily highs around -0.5°C.