Climate averages 1991–2020
Kouvola weather
in September.
A cool, moderately wet month: the 5th warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Kouvola: daytime highs average 14.2°C and nights cool to about 8.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 53 mm of rain on roughly 10 days, which makes September a moderately wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 59 min on an average September day.
The nearest other city in this atlas is Lahti (58 km away). In September its highs average 14.1°C, about as warm as Kouvola, with 51 mm of rain.
Among the 13 cities listed in Finland, Kouvola ranks 5th of 13 for the warmest September highs and joint 2nd of 13 for the driest September (rainfall, lowest first). The mean September high of those 13 cities is 13.8°C; Kouvola is 0.4°C warmer than that mean.
From September to October, average highs fall by 7.2°C to 7.0°C, and monthly rainfall rises from 53 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
Kouvola climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -3.8°C-8.3°C | -8.3°C | 44 | 10.6 | 6.67 h |
| February | -3.9°C-8.8°C | -8.8°C | 40 | 9.0 | 9.09 h |
| March | 0.5°C-5.8°C | -5.8°C | 36 | 8.6 | 11.712 h |
| April | 7.3°C-0.9°C | -0.9°C | 35 | 8.9 | 14.615 h |
| May | 14.7°C5.8°C | 5.8°C | 46 | 9.8 | 17.317 h |
| June | 18.9°C11.0°C | 11.0°C | 70 | 11.8 | 19.019 h |
| July | 21.5°C14.1°C | 14.1°C | 66 | 11.5 | 18.318 h |
| August | 19.8°C12.9°C | 12.9°C | 66 | 10.9 | 15.816 h |
| September, selected | 14.2°C8.4°C | 8.4°C | 53 | 9.9 | 13.013 h |
| October | 7.0°C2.9°C | 2.9°C | 57 | 10.9 | 10.110 h |
| November | 1.7°C-1.5°C | -1.5°C | 53 | 11.3 | 7.47 h |
| December | -1.6°C-5.5°C | -5.5°C | 54 | 11.7 | 5.86 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
- Lahti in SeptemberFinland · 58 kmHigh 14.1°C · Low 8.5°C · 51 mm rain
- Lappeenranta in SeptemberFinland · 83 kmHigh 13.9°C · Low 8.6°C · 56 mm rain
- Vantaa in SeptemberFinland · 111 kmHigh 14.9°C · Low 9.0°C · 57 mm rain
- Vyborg in SeptemberRussia · 113 kmHigh 14.2°C · Low 9.3°C · 59 mm rain
- Helsinki in SeptemberFinland · 124 kmHigh 14.6°C · Low 9.8°C · 57 mm rain
- Espoo in SeptemberFinland · 134 kmHigh 14.5°C · Low 10.0°C · 55 mm rain
- Jyväskylä in SeptemberFinland · 161 kmHigh 13.2°C · Low 8.1°C · 54 mm rain
- Tampere in SeptemberFinland · 171 kmHigh 13.5°C · Low 8.8°C · 53 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 Kouvola) is explained once on the Kouvola year overview and on the Sources, method and limits page.