| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -1.9° | -8.5° | 29.6mm | 14 | 2 |
| February | -2.1° | -9.5° | 48.9mm | 20 | 0 |
| March | 1.2° | -6.7° | 50.6mm | 19 | 2 |
| April | 7.6° | -1.2° | 25.3mm | 10 | 36 |
| May | 14° | 3.6° | 36.4mm | 12 | 57 |
| June | 19.2° | 9° | 47.3mm | 13 | 71 |
| July | 21.4° | 11.8° | — | — | 94 |
| August | 20.1° | 10.8° | — | — | 94 |
| September | 14.7° | 6.4° | — | — | 77 |
| October | 7.9° | 1.9° | — | — | 55 |
| November | 2.2° | -2.7° | — | — | 32 |
| December | -1° | -7.2° | — | — | 25 |
January in Vaasa averages a daily high of -1.9°C with nights around -8.5°C. Expect roughly 14 wet days totalling 29.6mm. A hard month to visit for comfort alone.
February in Vaasa averages a daily high of -2.1°C with nights around -9.5°C. Expect roughly 20 wet days totalling 48.9mm. A hard month to visit for comfort alone.
March in Vaasa averages a daily high of 1.2°C with nights around -6.7°C. Expect roughly 19 wet days totalling 50.6mm. A hard month to visit for comfort alone.
April in Vaasa averages a daily high of 7.6°C with nights around -1.2°C. Expect roughly 10 wet days totalling 25.3mm. Demanding conditions — pack for it and plan indoor options.
May in Vaasa averages a daily high of 14°C with nights around 3.6°C. Expect roughly 12 wet days totalling 36.4mm. Generally workable, with some weather to plan around.
June in Vaasa averages a daily high of 19.2°C with nights around 9°C. Expect roughly 13 wet days totalling 47.3mm. Generally workable, with some weather to plan around.
July in Vaasa averages a daily high of 21.4°C with nights around 11.8°C. Comfortable conditions for being outdoors all day.
August in Vaasa averages a daily high of 20.1°C with nights around 10.8°C. Comfortable conditions for being outdoors all day.
September in Vaasa averages a daily high of 14.7°C with nights around 6.4°C. Comfortable conditions for being outdoors all day.
October in Vaasa averages a daily high of 7.9°C with nights around 1.9°C. Generally workable, with some weather to plan around.
November in Vaasa averages a daily high of 2.2°C with nights around -2.7°C. A hard month to visit for comfort alone.
December in Vaasa averages a daily high of -1°C with nights around -7.2°C. 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. Vaasa peaks at 94.
Based on 30 years of records, July–August scores highest for comfort in Vaasa, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 21.4°C.
March is the wettest, averaging 50.6mm of rain across roughly 19 wet days.
February is the coolest month, with average daily highs around -2.1°C.