| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 10.1° | — | 46.3mm | 7.3 | 54 |
| February | 11.1° | — | 71.5mm | 9 | 54 |
| March | 14.5° | — | 102.1mm | 10.5 | 61 |
| April | 19.6° | — | 114.9mm | 10.5 | 78 |
| May | 24.3° | — | 139.7mm | 9.5 | 81 |
| June | 27.2° | — | 215.9mm | 12.4 | 74 |
| July | 31.3° | — | 249.5mm | 12.6 | 58 |
| August | 32.7° | — | 119mm | 9.4 | 58 |
| September | 29.2° | — | 144.9mm | 9.3 | 73 |
| October | 23.9° | — | 126.2mm | 8 | 84 |
| November | 18° | — | 82.2mm | 8.2 | 77 |
| December | 12.5° | — | 64.8mm | 9.3 | 57 |
January in Matsuyama averages a daily high of 10.1°C. Expect roughly 7.3 wet days totalling 46.3mm. Demanding conditions — pack for it and plan indoor options.
February in Matsuyama averages a daily high of 11.1°C. Expect roughly 9 wet days totalling 71.5mm. Demanding conditions — pack for it and plan indoor options.
March in Matsuyama averages a daily high of 14.5°C. Expect roughly 10.5 wet days totalling 102.1mm. Generally workable, with some weather to plan around.
April in Matsuyama averages a daily high of 19.6°C. Expect roughly 10.5 wet days totalling 114.9mm. Comfortable conditions for being outdoors all day.
May in Matsuyama averages a daily high of 24.3°C. Expect roughly 9.5 wet days totalling 139.7mm. Comfortable conditions for being outdoors all day.
June in Matsuyama averages a daily high of 27.2°C. Expect roughly 12.4 wet days totalling 215.9mm. Generally workable, with some weather to plan around.
July in Matsuyama averages a daily high of 31.3°C. Expect roughly 12.6 wet days totalling 249.5mm. Generally workable, with some weather to plan around.
August in Matsuyama averages a daily high of 32.7°C. Expect roughly 9.4 wet days totalling 119mm. Generally workable, with some weather to plan around.
September in Matsuyama averages a daily high of 29.2°C. Expect roughly 9.3 wet days totalling 144.9mm. Generally workable, with some weather to plan around.
October in Matsuyama averages a daily high of 23.9°C. Expect roughly 8 wet days totalling 126.2mm. Comfortable conditions for being outdoors all day.
November in Matsuyama averages a daily high of 18°C. Expect roughly 8.2 wet days totalling 82.2mm. Comfortable conditions for being outdoors all day.
December in Matsuyama averages a daily high of 12.5°C. Expect roughly 9.3 wet days totalling 64.8mm. Generally workable, with some weather to plan around.
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. Matsuyama peaks at 84.
Based on 30 years of records, April–May scores highest for comfort in Matsuyama, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 32.7°C.
July is the wettest, averaging 249.5mm of rain across roughly 12.6 wet days.
January is the coolest month, with average daily highs around 10.1°C.