| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -4.6° | -9.5° | 32.7mm | 14.4 | 1 |
| February | -3.5° | -8.6° | 27.7mm | 12 | 6 |
| March | 1.6° | -5.2° | 24.3mm | 10.9 | 12 |
| April | 7.9° | -0.1° | 27.7mm | 9.1 | 40 |
| May | 15.8° | 6.3° | 40.6mm | 9.8 | 67 |
| June | 20.1° | 11.2° | 52.7mm | 11.3 | 77 |
| July | 22.2° | 14° | 69.9mm | 12.6 | 75 |
| August | 20.2° | 12.7° | 68.9mm | 12.8 | 74 |
| September | 14.4° | 8.4° | 61.4mm | 12.1 | 58 |
| October | 7.7° | 2.9° | 59.8mm | 14.6 | 31 |
| November | 2.5° | -1.3° | 47.1mm | 15.9 | 10 |
| December | -2.1° | -6.3° | 37mm | 15.8 | 3 |
January in Lappeenranta averages a daily high of -4.6°C with nights around -9.5°C. Expect roughly 14.4 wet days totalling 32.7mm. A hard month to visit for comfort alone.
February in Lappeenranta averages a daily high of -3.5°C with nights around -8.6°C. Expect roughly 12 wet days totalling 27.7mm. A hard month to visit for comfort alone.
March in Lappeenranta averages a daily high of 1.6°C with nights around -5.2°C. Expect roughly 10.9 wet days totalling 24.3mm. A hard month to visit for comfort alone.
April in Lappeenranta averages a daily high of 7.9°C with nights around -0.1°C. Expect roughly 9.1 wet days totalling 27.7mm. Demanding conditions — pack for it and plan indoor options.
May in Lappeenranta averages a daily high of 15.8°C with nights around 6.3°C. Expect roughly 9.8 wet days totalling 40.6mm. Generally workable, with some weather to plan around.
June in Lappeenranta averages a daily high of 20.1°C with nights around 11.2°C. Expect roughly 11.3 wet days totalling 52.7mm. Comfortable conditions for being outdoors all day.
July in Lappeenranta averages a daily high of 22.2°C with nights around 14°C. Expect roughly 12.6 wet days totalling 69.9mm. Comfortable conditions for being outdoors all day.
August in Lappeenranta averages a daily high of 20.2°C with nights around 12.7°C. Expect roughly 12.8 wet days totalling 68.9mm. Generally workable, with some weather to plan around.
September in Lappeenranta averages a daily high of 14.4°C with nights around 8.4°C. Expect roughly 12.1 wet days totalling 61.4mm. Generally workable, with some weather to plan around.
October in Lappeenranta averages a daily high of 7.7°C with nights around 2.9°C. Expect roughly 14.6 wet days totalling 59.8mm. A hard month to visit for comfort alone.
November in Lappeenranta averages a daily high of 2.5°C with nights around -1.3°C. Expect roughly 15.9 wet days totalling 47.1mm. A hard month to visit for comfort alone.
December in Lappeenranta averages a daily high of -2.1°C with nights around -6.3°C. Expect roughly 15.8 wet days totalling 37mm. 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. Lappeenranta peaks at 77.
Based on 30 years of records, June–August scores highest for comfort in Lappeenranta, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.2°C.
July is the wettest, averaging 69.9mm of rain across roughly 12.6 wet days.
January is the coolest month, with average daily highs around -4.6°C.