| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.8° | — | 54.9mm | 7.5 | 43 |
| February | 8.7° | — | 101mm | 8.7 | 46 |
| March | 13.3° | — | 135.8mm | 10.7 | 57 |
| April | 19° | — | 157.5mm | 11.2 | 74 |
| May | 24° | — | 178.7mm | 10.6 | 79 |
| June | 26.7° | — | 187.6mm | 13.4 | 73 |
| July | 30.4° | — | 253.6mm | 15.3 | 56 |
| August | 31.8° | — | 170.1mm | 12.7 | 55 |
| September | 27.3° | — | 201.4mm | 11.6 | 76 |
| October | 21.2° | — | 167.6mm | 10.1 | 80 |
| November | 15.4° | — | 99.5mm | 8.6 | 68 |
| December | 9.4° | — | 67.6mm | 9.5 | 47 |
January in Iida averages a daily high of 6.8°C. Expect roughly 7.5 wet days totalling 54.9mm. Demanding conditions — pack for it and plan indoor options.
February in Iida averages a daily high of 8.7°C. Expect roughly 8.7 wet days totalling 101mm. Demanding conditions — pack for it and plan indoor options.
March in Iida averages a daily high of 13.3°C. Expect roughly 10.7 wet days totalling 135.8mm. Generally workable, with some weather to plan around.
April in Iida averages a daily high of 19°C. Expect roughly 11.2 wet days totalling 157.5mm. Generally workable, with some weather to plan around.
May in Iida averages a daily high of 24°C. Expect roughly 10.6 wet days totalling 178.7mm. Comfortable conditions for being outdoors all day.
June in Iida averages a daily high of 26.7°C. Expect roughly 13.4 wet days totalling 187.6mm. Generally workable, with some weather to plan around.
July in Iida averages a daily high of 30.4°C. Expect roughly 15.3 wet days totalling 253.6mm. Generally workable, with some weather to plan around.
August in Iida averages a daily high of 31.8°C. Expect roughly 12.7 wet days totalling 170.1mm. Generally workable, with some weather to plan around.
September in Iida averages a daily high of 27.3°C. Expect roughly 11.6 wet days totalling 201.4mm. Comfortable conditions for being outdoors all day.
October in Iida averages a daily high of 21.2°C. Expect roughly 10.1 wet days totalling 167.6mm. Comfortable conditions for being outdoors all day.
November in Iida averages a daily high of 15.4°C. Expect roughly 8.6 wet days totalling 99.5mm. Generally workable, with some weather to plan around.
December in Iida averages a daily high of 9.4°C. Expect roughly 9.5 wet days totalling 67.6mm. 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. Iida peaks at 80.
Based on 30 years of records, April–June scores highest for comfort in Iida, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 31.8°C.
July is the wettest, averaging 253.6mm of rain across roughly 15.3 wet days.
January is the coolest month, with average daily highs around 6.8°C.