| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 1.8° | — | 109.1mm | 20.8 | 15 |
| February | 2.5° | — | 92.7mm | 17.8 | 15 |
| March | 6.8° | — | 95.2mm | 13.9 | 30 |
| April | 13.2° | — | 89.5mm | 11.3 | 56 |
| May | 18.3° | — | 91.2mm | 11 | 73 |
| June | 21.3° | — | 89mm | 8.9 | 82 |
| July | 24.8° | — | 125.8mm | 11 | 78 |
| August | 26.3° | — | 227mm | 12.1 | 76 |
| September | 23.5° | — | 126.9mm | 10.5 | 79 |
| October | 17.8° | — | 131.6mm | 13.7 | 66 |
| November | 11.4° | — | 124mm | 17.1 | 42 |
| December | 4° | — | 129mm | 21.6 | 19 |
January in Mutsu averages a daily high of 1.8°C. Expect roughly 20.8 wet days totalling 109.1mm. A hard month to visit for comfort alone.
February in Mutsu averages a daily high of 2.5°C. Expect roughly 17.8 wet days totalling 92.7mm. A hard month to visit for comfort alone.
March in Mutsu averages a daily high of 6.8°C. Expect roughly 13.9 wet days totalling 95.2mm. A hard month to visit for comfort alone.
April in Mutsu averages a daily high of 13.2°C. Expect roughly 11.3 wet days totalling 89.5mm. Generally workable, with some weather to plan around.
May in Mutsu averages a daily high of 18.3°C. Expect roughly 11 wet days totalling 91.2mm. Generally workable, with some weather to plan around.
June in Mutsu averages a daily high of 21.3°C. Expect roughly 8.9 wet days totalling 89mm. Comfortable conditions for being outdoors all day.
July in Mutsu averages a daily high of 24.8°C. Expect roughly 11 wet days totalling 125.8mm. Comfortable conditions for being outdoors all day.
August in Mutsu averages a daily high of 26.3°C. Expect roughly 12.1 wet days totalling 227mm. Comfortable conditions for being outdoors all day.
September in Mutsu averages a daily high of 23.5°C. Expect roughly 10.5 wet days totalling 126.9mm. Comfortable conditions for being outdoors all day.
October in Mutsu averages a daily high of 17.8°C. Expect roughly 13.7 wet days totalling 131.6mm. Generally workable, with some weather to plan around.
November in Mutsu averages a daily high of 11.4°C. Expect roughly 17.1 wet days totalling 124mm. Demanding conditions — pack for it and plan indoor options.
December in Mutsu averages a daily high of 4°C. Expect roughly 21.6 wet days totalling 129mm. 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. Mutsu peaks at 82.
Based on 30 years of records, June–September scores highest for comfort in Mutsu, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 26.3°C.
August is the wettest, averaging 227mm of rain across roughly 12.1 wet days.
January is the coolest month, with average daily highs around 1.8°C.