| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 10.4° | — | 65.4mm | 8.2 | 53 |
| February | 12.6° | — | 143.3mm | 11 | 54 |
| March | 16.6° | — | 163.6mm | 11.4 | 66 |
| April | 21.5° | — | 172.3mm | 11.4 | 77 |
| May | 25.7° | — | 238.7mm | 10.1 | 80 |
| June | 27.7° | — | 566.9mm | 16.8 | 67 |
| July | 31.4° | — | 412.4mm | 15.4 | 52 |
| August | 32.4° | — | 233mm | 13.9 | 51 |
| September | 29.5° | — | 273.4mm | 13.3 | 63 |
| October | 24.6° | — | 114.2mm | 8.1 | 84 |
| November | 18.2° | — | 102.1mm | 10.3 | 74 |
| December | 12° | — | 81.5mm | 9.9 | 55 |
January in Honmachi averages a daily high of 10.4°C. Expect roughly 8.2 wet days totalling 65.4mm. Demanding conditions — pack for it and plan indoor options.
February in Honmachi averages a daily high of 12.6°C. Expect roughly 11 wet days totalling 143.3mm. Demanding conditions — pack for it and plan indoor options.
March in Honmachi averages a daily high of 16.6°C. Expect roughly 11.4 wet days totalling 163.6mm. Generally workable, with some weather to plan around.
April in Honmachi averages a daily high of 21.5°C. Expect roughly 11.4 wet days totalling 172.3mm. Comfortable conditions for being outdoors all day.
May in Honmachi averages a daily high of 25.7°C. Expect roughly 10.1 wet days totalling 238.7mm. Comfortable conditions for being outdoors all day.
June in Honmachi averages a daily high of 27.7°C. Expect roughly 16.8 wet days totalling 566.9mm. Generally workable, with some weather to plan around.
July in Honmachi averages a daily high of 31.4°C. Expect roughly 15.4 wet days totalling 412.4mm. Demanding conditions — pack for it and plan indoor options.
August in Honmachi averages a daily high of 32.4°C. Expect roughly 13.9 wet days totalling 233mm. Demanding conditions — pack for it and plan indoor options.
September in Honmachi averages a daily high of 29.5°C. Expect roughly 13.3 wet days totalling 273.4mm. Generally workable, with some weather to plan around.
October in Honmachi averages a daily high of 24.6°C. Expect roughly 8.1 wet days totalling 114.2mm. Comfortable conditions for being outdoors all day.
November in Honmachi averages a daily high of 18.2°C. Expect roughly 10.3 wet days totalling 102.1mm. Generally workable, with some weather to plan around.
December in Honmachi averages a daily high of 12°C. Expect roughly 9.9 wet days totalling 81.5mm. 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. Honmachi peaks at 84.
Based on 30 years of records, April–May scores highest for comfort in Honmachi, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 32.4°C.
June is the wettest, averaging 566.9mm of rain across roughly 16.8 wet days.
January is the coolest month, with average daily highs around 10.4°C.