| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -4.5° | -10.7° | 45mm | 17.8 | 0 |
| February | -3.7° | -10.9° | 42.9mm | 15.9 | 0 |
| March | 1.2° | -8° | 34.4mm | 13.1 | 4 |
| April | 8.3° | -2° | 34.3mm | 10.2 | 36 |
| May | 15.7° | 3.3° | 44.1mm | 10.5 | 65 |
| June | 20.4° | 8.7° | 61mm | 12.8 | 74 |
| July | 22.6° | 11.5° | 73.2mm | 13.1 | 74 |
| August | 20.7° | 9.8° | 63.5mm | 11.9 | 76 |
| September | 14.8° | 5.6° | 51.6mm | 12.4 | 59 |
| October | 7.5° | 1.4° | 60.7mm | 15.6 | 29 |
| November | 1.8° | -2.6° | 56mm | 17.1 | 8 |
| December | -2.6° | -8.1° | 55.1mm | 18.2 | 0 |
January in Mikkeli averages a daily high of -4.5°C with nights around -10.7°C. Expect roughly 17.8 wet days totalling 45mm. A hard month to visit for comfort alone.
February in Mikkeli averages a daily high of -3.7°C with nights around -10.9°C. Expect roughly 15.9 wet days totalling 42.9mm. A hard month to visit for comfort alone.
March in Mikkeli averages a daily high of 1.2°C with nights around -8°C. Expect roughly 13.1 wet days totalling 34.4mm. A hard month to visit for comfort alone.
April in Mikkeli averages a daily high of 8.3°C with nights around -2°C. Expect roughly 10.2 wet days totalling 34.3mm. Demanding conditions — pack for it and plan indoor options.
May in Mikkeli averages a daily high of 15.7°C with nights around 3.3°C. Expect roughly 10.5 wet days totalling 44.1mm. Generally workable, with some weather to plan around.
June in Mikkeli averages a daily high of 20.4°C with nights around 8.7°C. Expect roughly 12.8 wet days totalling 61mm. Generally workable, with some weather to plan around.
July in Mikkeli averages a daily high of 22.6°C with nights around 11.5°C. Expect roughly 13.1 wet days totalling 73.2mm. Generally workable, with some weather to plan around.
August in Mikkeli averages a daily high of 20.7°C with nights around 9.8°C. Expect roughly 11.9 wet days totalling 63.5mm. Comfortable conditions for being outdoors all day.
September in Mikkeli averages a daily high of 14.8°C with nights around 5.6°C. Expect roughly 12.4 wet days totalling 51.6mm. Generally workable, with some weather to plan around.
October in Mikkeli averages a daily high of 7.5°C with nights around 1.4°C. Expect roughly 15.6 wet days totalling 60.7mm. A hard month to visit for comfort alone.
November in Mikkeli averages a daily high of 1.8°C with nights around -2.6°C. Expect roughly 17.1 wet days totalling 56mm. A hard month to visit for comfort alone.
December in Mikkeli averages a daily high of -2.6°C with nights around -8.1°C. Expect roughly 18.2 wet days totalling 55.1mm. 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. Mikkeli peaks at 76.
Based on 30 years of records, June–August scores highest for comfort in Mikkeli, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.6°C.
July is the wettest, averaging 73.2mm of rain across roughly 13.1 wet days.
January is the coolest month, with average daily highs around -4.5°C.