| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9.3° | — | 37.5mm | 6.2 | 53 |
| February | 10.7° | — | 69.7mm | 7.8 | 55 |
| March | 14.6° | — | 119.7mm | 10 | 63 |
| April | 20.2° | — | 141.7mm | 10.3 | 79 |
| May | 24.9° | — | 171.1mm | 9.6 | 81 |
| June | 27.8° | — | 208.6mm | 12.7 | 71 |
| July | 31.6° | — | 228.7mm | 13.4 | 55 |
| August | 33.3° | — | 165.9mm | 10.5 | 54 |
| September | 29.1° | — | 197.4mm | 12.6 | 66 |
| October | 23.5° | — | 180.9mm | 10.2 | 80 |
| November | 17.3° | — | 82.2mm | 7.2 | 77 |
| December | 11.9° | — | 59.5mm | 6.4 | 61 |
January in Seto averages a daily high of 9.3°C. Expect roughly 6.2 wet days totalling 37.5mm. Demanding conditions — pack for it and plan indoor options.
February in Seto averages a daily high of 10.7°C. Expect roughly 7.8 wet days totalling 69.7mm. Generally workable, with some weather to plan around.
March in Seto averages a daily high of 14.6°C. Expect roughly 10 wet days totalling 119.7mm. Generally workable, with some weather to plan around.
April in Seto averages a daily high of 20.2°C. Expect roughly 10.3 wet days totalling 141.7mm. Comfortable conditions for being outdoors all day.
May in Seto averages a daily high of 24.9°C. Expect roughly 9.6 wet days totalling 171.1mm. Comfortable conditions for being outdoors all day.
June in Seto averages a daily high of 27.8°C. Expect roughly 12.7 wet days totalling 208.6mm. Generally workable, with some weather to plan around.
July in Seto averages a daily high of 31.6°C. Expect roughly 13.4 wet days totalling 228.7mm. Generally workable, with some weather to plan around.
August in Seto averages a daily high of 33.3°C. Expect roughly 10.5 wet days totalling 165.9mm. Demanding conditions — pack for it and plan indoor options.
September in Seto averages a daily high of 29.1°C. Expect roughly 12.6 wet days totalling 197.4mm. Generally workable, with some weather to plan around.
October in Seto averages a daily high of 23.5°C. Expect roughly 10.2 wet days totalling 180.9mm. Comfortable conditions for being outdoors all day.
November in Seto averages a daily high of 17.3°C. Expect roughly 7.2 wet days totalling 82.2mm. Comfortable conditions for being outdoors all day.
December in Seto averages a daily high of 11.9°C. Expect roughly 6.4 wet days totalling 59.5mm. 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. Seto peaks at 81.
Based on 30 years of records, April–May scores highest for comfort in Seto, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.3°C.
July is the wettest, averaging 228.7mm of rain across roughly 13.4 wet days.
January is the coolest month, with average daily highs around 9.3°C.