Pori Weather in September
September in Pori brings moderate temperatures around 16°C (61°F) during the day, dropping to 8°C (46°F) at night, with quite a bit of rainfall expected, averaging around 69 mm (2.7 in) for the month.
Rainfall in Pori in September
Past climate data indicates that roughly 17 days will see rain, totalling around 69 mm (2.7 in) for the month. This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.
Temperature in Pori in September
If you're visiting Pori in September, expect highs of 16°C (61°F) and overnight lows around 8°C (46°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights drop to 8°C (46°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Pori.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Pori's climate page.
Pori Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
16°C (61°F)
Chance of Rain
56%
Precipitation
69 mm (2.7 in)
Rainy days
17 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Pori typically drop from around 17°C (63°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cold, with lows typically ranging from 4°C (39°F) to 10°C (50°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Pori in September
Browse day-by-day weather records for Pori spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Pori historical weather extremes in September
The extremes listed below come from historical weather data collected in Pori from 1976 through 2025.
- The warmest day in September was on September 5, 2024, with a maximum of 27°C (81°F).
- On September 25, 1978, Pori saw its coldest September day with temperatures maxing out at 5°C (41°F).
- Nighttime temperatures dropped to -7°C (19°F) on September 30, 1976, marking the coldest September night on record.
Best Places in Finland in September
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in September →
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What to Wear in Pori in September
Pack for changing conditions in Pori in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days.What To Do in Pori in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Pori's climate page.
See the full Pori climate overview or explore weather in Finland.
