| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 8.2° | — | 158.6mm | 21.3 | 32 |
| February | 9.4° | — | 118mm | 17.1 | 36 |
| March | 13.1° | — | 129.6mm | 15.6 | 48 |
| April | 18.4° | — | 122.3mm | 12.8 | 69 |
| May | 23.3° | — | 124.6mm | 9.8 | 80 |
| June | 26.2° | — | 156.2mm | 11.8 | 76 |
| July | 30° | — | 206.1mm | 13 | 62 |
| August | 31.9° | — | 125.7mm | 11.1 | 58 |
| September | 27.2° | — | 199.4mm | 12.9 | 73 |
| October | 22.1° | — | 138.1mm | 11.7 | 77 |
| November | 16.5° | — | 116.9mm | 14.6 | 60 |
| December | 11.1° | — | 161.2mm | 21.4 | 42 |
January in Izumo averages a daily high of 8.2°C. Expect roughly 21.3 wet days totalling 158.6mm. A hard month to visit for comfort alone.
February in Izumo averages a daily high of 9.4°C. Expect roughly 17.1 wet days totalling 118mm. Demanding conditions — pack for it and plan indoor options.
March in Izumo averages a daily high of 13.1°C. Expect roughly 15.6 wet days totalling 129.6mm. Demanding conditions — pack for it and plan indoor options.
April in Izumo averages a daily high of 18.4°C. Expect roughly 12.8 wet days totalling 122.3mm. Generally workable, with some weather to plan around.
May in Izumo averages a daily high of 23.3°C. Expect roughly 9.8 wet days totalling 124.6mm. Comfortable conditions for being outdoors all day.
June in Izumo averages a daily high of 26.2°C. Expect roughly 11.8 wet days totalling 156.2mm. Comfortable conditions for being outdoors all day.
July in Izumo averages a daily high of 30°C. Expect roughly 13 wet days totalling 206.1mm. Generally workable, with some weather to plan around.
August in Izumo averages a daily high of 31.9°C. Expect roughly 11.1 wet days totalling 125.7mm. Generally workable, with some weather to plan around.
September in Izumo averages a daily high of 27.2°C. Expect roughly 12.9 wet days totalling 199.4mm. Generally workable, with some weather to plan around.
October in Izumo averages a daily high of 22.1°C. Expect roughly 11.7 wet days totalling 138.1mm. Comfortable conditions for being outdoors all day.
November in Izumo averages a daily high of 16.5°C. Expect roughly 14.6 wet days totalling 116.9mm. Generally workable, with some weather to plan around.
December in Izumo averages a daily high of 11.1°C. Expect roughly 21.4 wet days totalling 161.2mm. 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. Izumo peaks at 80.
Based on 30 years of records, May–June scores highest for comfort in Izumo, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 31.9°C.
July is the wettest, averaging 206.1mm of rain across roughly 13 wet days.
January is the coolest month, with average daily highs around 8.2°C.