| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.1° | — | 34.4mm | 6.6 | 39 |
| February | 6.1° | — | 40.1mm | 6.8 | 42 |
| March | 10.4° | — | 88.1mm | 9.4 | 50 |
| April | 16.3° | — | 122.3mm | 10.6 | 67 |
| May | 21.6° | — | 123.3mm | 10.9 | 78 |
| June | 24.5° | — | 157mm | 14.3 | 71 |
| July | 27.9° | — | 207.8mm | 16.7 | 66 |
| August | 29.1° | — | 192.2mm | 15.6 | 62 |
| September | 24.9° | — | 191.4mm | 12.9 | 74 |
| October | 19.2° | — | 166.6mm | 10.6 | 76 |
| November | 13.6° | — | 65.5mm | 7.3 | 65 |
| December | 7.7° | — | 52.6mm | 7.3 | 46 |
January in Ōtawara averages a daily high of 5.1°C. Expect roughly 6.6 wet days totalling 34.4mm. Demanding conditions — pack for it and plan indoor options.
February in Ōtawara averages a daily high of 6.1°C. Expect roughly 6.8 wet days totalling 40.1mm. Demanding conditions — pack for it and plan indoor options.
March in Ōtawara averages a daily high of 10.4°C. Expect roughly 9.4 wet days totalling 88.1mm. Demanding conditions — pack for it and plan indoor options.
April in Ōtawara averages a daily high of 16.3°C. Expect roughly 10.6 wet days totalling 122.3mm. Generally workable, with some weather to plan around.
May in Ōtawara averages a daily high of 21.6°C. Expect roughly 10.9 wet days totalling 123.3mm. Comfortable conditions for being outdoors all day.
June in Ōtawara averages a daily high of 24.5°C. Expect roughly 14.3 wet days totalling 157mm. Generally workable, with some weather to plan around.
July in Ōtawara averages a daily high of 27.9°C. Expect roughly 16.7 wet days totalling 207.8mm. Generally workable, with some weather to plan around.
August in Ōtawara averages a daily high of 29.1°C. Expect roughly 15.6 wet days totalling 192.2mm. Generally workable, with some weather to plan around.
September in Ōtawara averages a daily high of 24.9°C. Expect roughly 12.9 wet days totalling 191.4mm. Generally workable, with some weather to plan around.
October in Ōtawara averages a daily high of 19.2°C. Expect roughly 10.6 wet days totalling 166.6mm. Comfortable conditions for being outdoors all day.
November in Ōtawara averages a daily high of 13.6°C. Expect roughly 7.3 wet days totalling 65.5mm. Generally workable, with some weather to plan around.
December in Ōtawara averages a daily high of 7.7°C. Expect roughly 7.3 wet days totalling 52.6mm. 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. Ōtawara peaks at 78.
Based on 30 years of records, May–June scores highest for comfort in Ōtawara, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 29.1°C.
July is the wettest, averaging 207.8mm of rain across roughly 16.7 wet days.
January is the coolest month, with average daily highs around 5.1°C.