| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 11.8° | — | 63.6mm | 5.1 | 64 |
| February | 12.6° | — | 125.5mm | 7.4 | 62 |
| March | 16.1° | — | 216.9mm | 10.2 | 67 |
| April | 20.1° | — | 228mm | 11.2 | 78 |
| May | 23.8° | — | 243.6mm | 10.5 | 79 |
| June | 26.7° | — | 270.2mm | 13 | 74 |
| July | 30.3° | — | 292.4mm | 12.8 | 61 |
| August | 31.6° | — | 178.9mm | 11.2 | 59 |
| September | 28.7° | — | 270.3mm | 12.4 | 68 |
| October | 23.9° | — | 251.1mm | 10.1 | 80 |
| November | 19.1° | — | 119.6mm | 7.9 | 81 |
| December | 14.2° | — | 86.8mm | 5.5 | 70 |
January in Yaizu averages a daily high of 11.8°C. Expect roughly 5.1 wet days totalling 63.6mm. Generally workable, with some weather to plan around.
February in Yaizu averages a daily high of 12.6°C. Expect roughly 7.4 wet days totalling 125.5mm. Generally workable, with some weather to plan around.
March in Yaizu averages a daily high of 16.1°C. Expect roughly 10.2 wet days totalling 216.9mm. Generally workable, with some weather to plan around.
April in Yaizu averages a daily high of 20.1°C. Expect roughly 11.2 wet days totalling 228mm. Comfortable conditions for being outdoors all day.
May in Yaizu averages a daily high of 23.8°C. Expect roughly 10.5 wet days totalling 243.6mm. Comfortable conditions for being outdoors all day.
June in Yaizu averages a daily high of 26.7°C. Expect roughly 13 wet days totalling 270.2mm. Generally workable, with some weather to plan around.
July in Yaizu averages a daily high of 30.3°C. Expect roughly 12.8 wet days totalling 292.4mm. Generally workable, with some weather to plan around.
August in Yaizu averages a daily high of 31.6°C. Expect roughly 11.2 wet days totalling 178.9mm. Generally workable, with some weather to plan around.
September in Yaizu averages a daily high of 28.7°C. Expect roughly 12.4 wet days totalling 270.3mm. Generally workable, with some weather to plan around.
October in Yaizu averages a daily high of 23.9°C. Expect roughly 10.1 wet days totalling 251.1mm. Comfortable conditions for being outdoors all day.
November in Yaizu averages a daily high of 19.1°C. Expect roughly 7.9 wet days totalling 119.6mm. Comfortable conditions for being outdoors all day.
December in Yaizu averages a daily high of 14.2°C. Expect roughly 5.5 wet days totalling 86.8mm. 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. Yaizu peaks at 81.
Based on 30 years of records, April–June scores highest for comfort in Yaizu, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 31.6°C.
July is the wettest, averaging 292.4mm of rain across roughly 12.8 wet days.
January is the coolest month, with average daily highs around 11.8°C.