Weather in Pori in September 2025
Average weather
Average temperature in Pori in September
The expected average maximum temperature in September is +18°C with a maximum of +22°C and a minimum of +3°C.
The average maximum temperature goes down 21% by the end of the month, compared with the beginning of the month, from +18°C to +14°C.
Is Pori warm or cold in September?
Pori is typically mild in September.
Maximum temperatures go down compared to the previous month from +19°C to +14°C. The minimum temperature also goes down from +12°C to +8°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Pori:
Climate in Pori in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +19°C | +14°C | +8°C | ||||
| Min. temperature | ||||||
| +3°C | -3°C | -15°C | ||||
| Max. temperature | ||||||
| +32°C | +25°C | +20°C | ||||
| Rainfall | ||||||
| 83 mm | 65 mm | 61 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 80% | 83% | 85% | ||||
| Air pressure | ||||||
| 1011 HPa | 1011 HPa | 1010 HPa | ||||
| Sunny days | ||||||
| 5 | 3 | 2 | ||||
| Cloudy days | ||||||
| 7 | 11 | 12 | ||||
| Rainy days | ||||||
| 19 | 16 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 2 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +19°C in the day, the average maximum temperature lowers to +14°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 83 mm to 65 mm. Humidity rises from 80% to 83%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The days becoming less sunny, going from 5 sunny days in August to 3 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Pori is gradually increasing during September, going from 2 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Pori?
Climate Change over Years
The climate in Pori in September has not changed much over the last 43 years.
The average temperature was the lowest in 1987 (+6°C) and the highest in 2020 (+11°C). The driest year was 2002 with only 323 mm of rainfall, and the wettest year was 2020 with 874 mm.
FAQ
Is September a good time to visit Pori?
Can you sunbathe in Pori in September?
Is Pori rainy in September?
Is it sunny in Pori in September?
Other cities in Finland
Monthly weather in Pori
Source of the data
For this page, we’ve looked at the typical weather in Pori, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.