| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.8° | — | 31.2mm | 6.1 | 39 |
| February | 5.6° | — | 31.8mm | 6.7 | 41 |
| March | 9.3° | — | 83.1mm | 8.1 | 50 |
| April | 14.6° | — | 107mm | 9.2 | 64 |
| May | 19.3° | — | 99.3mm | 9.1 | 80 |
| June | 22.4° | — | 115.9mm | 9.7 | 81 |
| July | 26.1° | — | 135.4mm | 12.8 | 74 |
| August | 27.4° | — | 128.5mm | 11.2 | 76 |
| September | 24.4° | — | 154.2mm | 10.6 | 79 |
| October | 19.3° | — | 131.6mm | 8.6 | 81 |
| November | 13.5° | — | 56.6mm | 7 | 65 |
| December | 7.4° | — | 53mm | 7.3 | 45 |
January in Ishinomaki averages a daily high of 4.8°C. Expect roughly 6.1 wet days totalling 31.2mm. Demanding conditions — pack for it and plan indoor options.
February in Ishinomaki averages a daily high of 5.6°C. Expect roughly 6.7 wet days totalling 31.8mm. Demanding conditions — pack for it and plan indoor options.
March in Ishinomaki averages a daily high of 9.3°C. Expect roughly 8.1 wet days totalling 83.1mm. Demanding conditions — pack for it and plan indoor options.
April in Ishinomaki averages a daily high of 14.6°C. Expect roughly 9.2 wet days totalling 107mm. Generally workable, with some weather to plan around.
May in Ishinomaki averages a daily high of 19.3°C. Expect roughly 9.1 wet days totalling 99.3mm. Comfortable conditions for being outdoors all day.
June in Ishinomaki averages a daily high of 22.4°C. Expect roughly 9.7 wet days totalling 115.9mm. Comfortable conditions for being outdoors all day.
July in Ishinomaki averages a daily high of 26.1°C. Expect roughly 12.8 wet days totalling 135.4mm. Generally workable, with some weather to plan around.
August in Ishinomaki averages a daily high of 27.4°C. Expect roughly 11.2 wet days totalling 128.5mm. Comfortable conditions for being outdoors all day.
September in Ishinomaki averages a daily high of 24.4°C. Expect roughly 10.6 wet days totalling 154.2mm. Comfortable conditions for being outdoors all day.
October in Ishinomaki averages a daily high of 19.3°C. Expect roughly 8.6 wet days totalling 131.6mm. Comfortable conditions for being outdoors all day.
November in Ishinomaki averages a daily high of 13.5°C. Expect roughly 7 wet days totalling 56.6mm. Generally workable, with some weather to plan around.
December in Ishinomaki averages a daily high of 7.4°C. Expect roughly 7.3 wet days totalling 53mm. 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. Ishinomaki peaks at 81.
Based on 30 years of records, May–October scores highest for comfort in Ishinomaki, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 27.4°C.
September is the wettest, averaging 154.2mm of rain across roughly 10.6 wet days.
January is the coolest month, with average daily highs around 4.8°C.