| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9.1° | — | 52mm | 7.8 | 50 |
| February | 10.5° | — | 84.8mm | 8.9 | 52 |
| March | 14.8° | — | 127.1mm | 9.6 | 64 |
| April | 20.3° | — | 175.5mm | 10.2 | 80 |
| May | 25.1° | — | 200.4mm | 10.2 | 80 |
| June | 28.3° | — | 225.5mm | 12.3 | 70 |
| July | 32° | — | 279.6mm | 13.9 | 52 |
| August | 33.7° | — | 186.9mm | 11.9 | 49 |
| September | 29.4° | — | 236.6mm | 12.4 | 66 |
| October | 23.8° | — | 163.4mm | 9.3 | 81 |
| November | 17.9° | — | 89mm | 8.1 | 77 |
| December | 11.7° | — | 81.3mm | 9.7 | 54 |
January in Mizuho averages a daily high of 9.1°C. Expect roughly 7.8 wet days totalling 52mm. Demanding conditions — pack for it and plan indoor options.
February in Mizuho averages a daily high of 10.5°C. Expect roughly 8.9 wet days totalling 84.8mm. Demanding conditions — pack for it and plan indoor options.
March in Mizuho averages a daily high of 14.8°C. Expect roughly 9.6 wet days totalling 127.1mm. Generally workable, with some weather to plan around.
April in Mizuho averages a daily high of 20.3°C. Expect roughly 10.2 wet days totalling 175.5mm. Comfortable conditions for being outdoors all day.
May in Mizuho averages a daily high of 25.1°C. Expect roughly 10.2 wet days totalling 200.4mm. Comfortable conditions for being outdoors all day.
June in Mizuho averages a daily high of 28.3°C. Expect roughly 12.3 wet days totalling 225.5mm. Generally workable, with some weather to plan around.
July in Mizuho averages a daily high of 32°C. Expect roughly 13.9 wet days totalling 279.6mm. Demanding conditions — pack for it and plan indoor options.
August in Mizuho averages a daily high of 33.7°C. Expect roughly 11.9 wet days totalling 186.9mm. Demanding conditions — pack for it and plan indoor options.
September in Mizuho averages a daily high of 29.4°C. Expect roughly 12.4 wet days totalling 236.6mm. Generally workable, with some weather to plan around.
October in Mizuho averages a daily high of 23.8°C. Expect roughly 9.3 wet days totalling 163.4mm. Comfortable conditions for being outdoors all day.
November in Mizuho averages a daily high of 17.9°C. Expect roughly 8.1 wet days totalling 89mm. Comfortable conditions for being outdoors all day.
December in Mizuho averages a daily high of 11.7°C. Expect roughly 9.7 wet days totalling 81.3mm. 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. Mizuho peaks at 81.
Based on 30 years of records, April–May scores highest for comfort in Mizuho, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.7°C.
July is the wettest, averaging 279.6mm of rain across roughly 13.9 wet days.
January is the coolest month, with average daily highs around 9.1°C.