| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.2° | — | 37.2mm | 9.3 | 26 |
| February | 0.9° | — | 40.2mm | 9.9 | 25 |
| March | 4.6° | — | 59.6mm | 10.3 | 30 |
| April | 10° | — | 81.5mm | 10.9 | 46 |
| May | 15° | — | 122.8mm | 12.3 | 59 |
| June | 18.1° | — | 131.6mm | 10.7 | 73 |
| July | 21.9° | — | 160.9mm | 12.4 | 75 |
| August | 24.2° | — | 205mm | 14.2 | 72 |
| September | 22.1° | — | 161mm | 11.4 | 77 |
| October | 16.3° | — | 131.8mm | 11.6 | 65 |
| November | 9.2° | — | 89.2mm | 10.6 | 44 |
| December | 2.6° | — | 60.7mm | 9.8 | 25 |
January in Tomakomai averages a daily high of 0.2°C. Expect roughly 9.3 wet days totalling 37.2mm. A hard month to visit for comfort alone.
February in Tomakomai averages a daily high of 0.9°C. Expect roughly 9.9 wet days totalling 40.2mm. A hard month to visit for comfort alone.
March in Tomakomai averages a daily high of 4.6°C. Expect roughly 10.3 wet days totalling 59.6mm. A hard month to visit for comfort alone.
April in Tomakomai averages a daily high of 10°C. Expect roughly 10.9 wet days totalling 81.5mm. Demanding conditions — pack for it and plan indoor options.
May in Tomakomai averages a daily high of 15°C. Expect roughly 12.3 wet days totalling 122.8mm. Generally workable, with some weather to plan around.
June in Tomakomai averages a daily high of 18.1°C. Expect roughly 10.7 wet days totalling 131.6mm. Generally workable, with some weather to plan around.
July in Tomakomai averages a daily high of 21.9°C. Expect roughly 12.4 wet days totalling 160.9mm. Comfortable conditions for being outdoors all day.
August in Tomakomai averages a daily high of 24.2°C. Expect roughly 14.2 wet days totalling 205mm. Generally workable, with some weather to plan around.
September in Tomakomai averages a daily high of 22.1°C. Expect roughly 11.4 wet days totalling 161mm. Comfortable conditions for being outdoors all day.
October in Tomakomai averages a daily high of 16.3°C. Expect roughly 11.6 wet days totalling 131.8mm. Generally workable, with some weather to plan around.
November in Tomakomai averages a daily high of 9.2°C. Expect roughly 10.6 wet days totalling 89.2mm. Demanding conditions — pack for it and plan indoor options.
December in Tomakomai averages a daily high of 2.6°C. Expect roughly 9.8 wet days totalling 60.7mm. A hard month to visit for comfort alone.
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. Tomakomai peaks at 77.
Based on 30 years of records, June–September scores highest for comfort in Tomakomai, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 24.2°C.
August is the wettest, averaging 205mm of rain across roughly 14.2 wet days.
January is the coolest month, with average daily highs around 0.2°C.