| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.6° | — | 77.1mm | 20.1 | 15 |
| February | 1.8° | — | 70.6mm | 18.7 | 15 |
| March | 5.8° | — | 66.9mm | 16.3 | 25 |
| April | 12.2° | — | 78.3mm | 12.2 | 51 |
| May | 17.4° | — | 87.1mm | 11.6 | 68 |
| June | 20.6° | — | 88.3mm | 9.5 | 81 |
| July | 24.4° | — | 123.3mm | 11.1 | 78 |
| August | 26.1° | — | 150.2mm | 11 | 78 |
| September | 23.3° | — | 129.8mm | 10.5 | 79 |
| October | 17.2° | — | 97.4mm | 11.7 | 68 |
| November | 10° | — | 121.9mm | 16.2 | 38 |
| December | 2.8° | — | 128.8mm | 20.1 | 15 |
January in Hakodate averages a daily high of 0.6°C. Expect roughly 20.1 wet days totalling 77.1mm. A hard month to visit for comfort alone.
February in Hakodate averages a daily high of 1.8°C. Expect roughly 18.7 wet days totalling 70.6mm. A hard month to visit for comfort alone.
March in Hakodate averages a daily high of 5.8°C. Expect roughly 16.3 wet days totalling 66.9mm. A hard month to visit for comfort alone.
April in Hakodate averages a daily high of 12.2°C. Expect roughly 12.2 wet days totalling 78.3mm. Demanding conditions — pack for it and plan indoor options.
May in Hakodate averages a daily high of 17.4°C. Expect roughly 11.6 wet days totalling 87.1mm. Generally workable, with some weather to plan around.
June in Hakodate averages a daily high of 20.6°C. Expect roughly 9.5 wet days totalling 88.3mm. Comfortable conditions for being outdoors all day.
July in Hakodate averages a daily high of 24.4°C. Expect roughly 11.1 wet days totalling 123.3mm. Comfortable conditions for being outdoors all day.
August in Hakodate averages a daily high of 26.1°C. Expect roughly 11 wet days totalling 150.2mm. Comfortable conditions for being outdoors all day.
September in Hakodate averages a daily high of 23.3°C. Expect roughly 10.5 wet days totalling 129.8mm. Comfortable conditions for being outdoors all day.
October in Hakodate averages a daily high of 17.2°C. Expect roughly 11.7 wet days totalling 97.4mm. Generally workable, with some weather to plan around.
November in Hakodate averages a daily high of 10°C. Expect roughly 16.2 wet days totalling 121.9mm. Demanding conditions — pack for it and plan indoor options.
December in Hakodate averages a daily high of 2.8°C. Expect roughly 20.1 wet days totalling 128.8mm. 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. Hakodate peaks at 81.
Based on 30 years of records, June–September scores highest for comfort in Hakodate, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 26.1°C.
August is the wettest, averaging 150.2mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 0.6°C.