| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 2.8° | — | 47.5mm | 7.4 | 30 |
| February | 3.7° | — | 37.9mm | 7.6 | 33 |
| March | 8.2° | — | 57.6mm | 8.1 | 46 |
| April | 14.2° | — | 78.6mm | 10.6 | 60 |
| May | 19.6° | — | 82mm | 10.4 | 78 |
| June | 21.9° | — | 88.5mm | 9.6 | 81 |
| July | 25.7° | — | 125.4mm | 12 | 76 |
| August | 26.9° | — | 164.2mm | 12.3 | 75 |
| September | 23.9° | — | 136.4mm | 10.1 | 80 |
| October | 18.3° | — | 131.1mm | 10.3 | 74 |
| November | 12° | — | 51.2mm | 9.1 | 56 |
| December | 5.4° | — | 61.2mm | 9.2 | 35 |
January in Hachinohe averages a daily high of 2.8°C. Expect roughly 7.4 wet days totalling 47.5mm. A hard month to visit for comfort alone.
February in Hachinohe averages a daily high of 3.7°C. Expect roughly 7.6 wet days totalling 37.9mm. A hard month to visit for comfort alone.
March in Hachinohe averages a daily high of 8.2°C. Expect roughly 8.1 wet days totalling 57.6mm. Demanding conditions — pack for it and plan indoor options.
April in Hachinohe averages a daily high of 14.2°C. Expect roughly 10.6 wet days totalling 78.6mm. Generally workable, with some weather to plan around.
May in Hachinohe averages a daily high of 19.6°C. Expect roughly 10.4 wet days totalling 82mm. Comfortable conditions for being outdoors all day.
June in Hachinohe averages a daily high of 21.9°C. Expect roughly 9.6 wet days totalling 88.5mm. Comfortable conditions for being outdoors all day.
July in Hachinohe averages a daily high of 25.7°C. Expect roughly 12 wet days totalling 125.4mm. Comfortable conditions for being outdoors all day.
August in Hachinohe averages a daily high of 26.9°C. Expect roughly 12.3 wet days totalling 164.2mm. Comfortable conditions for being outdoors all day.
September in Hachinohe averages a daily high of 23.9°C. Expect roughly 10.1 wet days totalling 136.4mm. Comfortable conditions for being outdoors all day.
October in Hachinohe averages a daily high of 18.3°C. Expect roughly 10.3 wet days totalling 131.1mm. Generally workable, with some weather to plan around.
November in Hachinohe averages a daily high of 12°C. Expect roughly 9.1 wet days totalling 51.2mm. Generally workable, with some weather to plan around.
December in Hachinohe averages a daily high of 5.4°C. Expect roughly 9.2 wet days totalling 61.2mm. Demanding conditions — pack for it and plan indoor options.
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. Hachinohe peaks at 81.
Based on 30 years of records, May–October scores highest for comfort in Hachinohe, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 26.9°C.
August is the wettest, averaging 164.2mm of rain across roughly 12.3 wet days.
January is the coolest month, with average daily highs around 2.8°C.