Climate averages 1991–2020
Lappeenranta weather
in September.
A cool, moderately wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Lappeenranta: daytime highs average 13.9°C and nights cool to about 8.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 56 mm of rain on roughly 11 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 00 min on an average September day.
The nearest other city in this atlas is Vyborg (50 km away). In September its highs average 14.2°C, about as warm as Lappeenranta, with 59 mm of rain.
Among the 13 cities listed in Finland, Lappeenranta ranks 8th of 13 for the warmest September highs and joint 6th of 13 for the driest September (rainfall, lowest first). The mean September high of those 13 cities is 13.8°C; Lappeenranta is 0.1°C warmer than that mean.
From September to October, average highs fall by 7.2°C to 6.7°C, and monthly rainfall rises from 56 mm to 57 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Lappeenranta climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -4.5°C-8.4°C | -8.4°C | 42 | 10.3 | 6.57 h |
| February | -4.8°C-8.8°C | -8.8°C | 38 | 9.1 | 8.99 h |
| March | -0.8°C-5.5°C | -5.5°C | 36 | 9.0 | 11.712 h |
| April | 5.6°C-1.2°C | -1.2°C | 33 | 8.4 | 14.615 h |
| May | 14.0°C5.2°C | 5.2°C | 46 | 9.2 | 17.417 h |
| June | 18.8°C11.0°C | 11.0°C | 66 | 11.9 | 19.119 h |
| July | 21.5°C14.2°C | 14.2°C | 73 | 11.9 | 18.318 h |
| August | 19.6°C13.1°C | 13.1°C | 75 | 12.4 | 15.816 h |
| September, selected | 13.9°C8.6°C | 8.6°C | 56 | 10.7 | 13.013 h |
| October | 6.7°C2.9°C | 2.9°C | 57 | 11.2 | 10.110 h |
| November | 1.3°C-1.6°C | -1.6°C | 54 | 11.2 | 7.47 h |
| December | -2.0°C-5.5°C | -5.5°C | 52 | 11.3 | 5.76 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Vyborg in SeptemberRussia · 50 kmHigh 14.2°C · Low 9.3°C · 59 mm rain
- Kouvola in SeptemberFinland · 83 kmHigh 14.2°C · Low 8.4°C · 53 mm rain
- Lahti in SeptemberFinland · 136 kmHigh 14.1°C · Low 8.5°C · 51 mm rain
- Peterhof in SeptemberRussia · 161 kmHigh 13.9°C · Low 9.4°C · 63 mm rain
- Saint Petersburg in SeptemberRussia · 170 kmHigh 14.4°C · Low 9.1°C · 55 mm rain
- Jyväskylä in SeptemberFinland · 185 kmHigh 13.2°C · Low 8.1°C · 54 mm rain
- Joensuu in SeptemberFinland · 190 kmHigh 12.4°C · Low 8.8°C · 68 mm rain
- Vantaa in SeptemberFinland · 191 kmHigh 14.9°C · Low 9.0°C · 57 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lappeenranta) is explained once on the Lappeenranta year overview and on the Sources, method and limits page.