Climate averages 1991–2020
Pori weather
in September.
A cool, moderately wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Pori: daytime highs average 14.1°C and nights cool to about 9.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 62 mm of rain on roughly 10 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 01 min on an average September day.
The nearest other city in this atlas is Tampere (106 km away). In September its highs average 13.5°C, 0.6°C cooler than Pori, with 53 mm of rain.
Among the 13 cities listed in Finland, Pori ranks joint 6th of 13 for the warmest September highs and 11th of 13 for the driest September (rainfall, lowest first). The mean September high of those 13 cities is 13.8°C; Pori is 0.4°C warmer than that mean.
From September to October, average highs fall by 6.4°C to 7.7°C, and monthly rainfall rises from 62 mm to 65 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
Pori climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.5°C-5.3°C | -5.3°C | 43 | 10.2 | 6.46 h |
| February | -2.1°C-6.5°C | -6.5°C | 34 | 8.0 | 8.99 h |
| March | 1.2°C-4.1°C | -4.1°C | 33 | 8.3 | 11.712 h |
| April | 7.0°C0.6°C | 0.6°C | 33 | 8.2 | 14.715 h |
| May | 12.5°C5.6°C | 5.6°C | 39 | 7.8 | 17.517 h |
| June | 16.8°C10.4°C | 10.4°C | 60 | 10.3 | 19.319 h |
| July | 20.0°C14.0°C | 14.0°C | 74 | 11.7 | 18.518 h |
| August | 19.0°C13.5°C | 13.5°C | 74 | 12.2 | 15.916 h |
| September, selected | 14.1°C9.4°C | 9.4°C | 62 | 10.2 | 13.013 h |
| October | 7.7°C4.2°C | 4.2°C | 65 | 11.5 | 10.110 h |
| November | 3.2°C0.4°C | 0.4°C | 56 | 11.1 | 7.37 h |
| December | 0.4°C-2.9°C | -2.9°C | 52 | 11.5 | 5.66 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
- Tampere in SeptemberFinland · 106 kmHigh 13.5°C · Low 8.8°C · 53 mm rain
- Turku in SeptemberFinland · 117 kmHigh 15.0°C · Low 8.8°C · 58 mm rain
- Mariehamn in SeptemberAland Islands · 184 kmHigh 14.3°C · Low 11.8°C · 54 mm rain
- Espoo in SeptemberFinland · 210 kmHigh 14.5°C · Low 10.0°C · 55 mm rain
- Lahti in SeptemberFinland · 215 kmHigh 14.1°C · Low 8.5°C · 51 mm rain
- Vantaa in SeptemberFinland · 220 kmHigh 14.9°C · Low 9.0°C · 57 mm rain
- Jyväskylä in SeptemberFinland · 223 kmHigh 13.2°C · Low 8.1°C · 54 mm rain
- Helsinki in SeptemberFinland · 224 kmHigh 14.6°C · Low 9.8°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 Pori) is explained once on the Pori year overview and on the Sources, method and limits page.