Click on a day for an hourly weather forecast
The temperatures in Lappeenranta in September are quite cold with temperatures between 9°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Lappeenranta during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Lappeenranta in September 2025.
If you’re planning to visit Lappeenranta in the near future, we highly recommend that you review the 14 day weather forecast for Lappeenranta before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -5° / -9° | 4 | 4 | 24 | 81 mm | Awful | Lappeenranta in January |
| February | -4° / -9° | 4 | 2 | 23 | 79 mm | Awful | Lappeenranta in February |
| March | -1° / -6° | 6 | 5 | 22 | 75 mm | Awful | Lappeenranta in March |
| April | 6° / 0° | 8 | 12 | 11 | 67 mm | Awful | Lappeenranta in April |
| May | 15° / 6° | 7 | 22 | 2 | 76 mm | Bad | Lappeenranta in May |
| June | 19° / 10° | 7 | 22 | 0 | 96 mm | Ok | Lappeenranta in June |
| July | 23° / 13° | 7 | 24 | 0 | 105 mm | Good | Lappeenranta in July |
| August | 20° / 12° | 7 | 24 | 0 | 108 mm | Ok | Lappeenranta in August |
| September | 15° / 9° | 7 | 23 | 0 | 95 mm | Ok | Lappeenranta in September |
| October | 7° / 3° | 9 | 16 | 6 | 102 mm | Awful | Lappeenranta in October |
| November | 3° / 0° | 8 | 10 | 12 | 93 mm | Awful | Lappeenranta in November |
| December | -2° / -5° | 7 | 3 | 23 | 93 mm | Awful | Lappeenranta in December |