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September Weather in Pori, Finland

Last updated: August 23, 2025

In September, the average temperature in Pori, Finland hovers around 12°C (54°F), with a minimum of 1°C (35°F) and a maximum of 23°C (74°F). Expect 77 mm (3.0 in) of precipitation spread over 12 days, contributing to an average humidity of 86%. Perfect for cozy indoor activities, don't forget your umbrella!

September Temperature in Pori

In September in Pori, the average temperature is 12°C (54°F). Maximums can reach 23°C (74°F) and minimums can drop to as low as 1°C (35°F). This variation makes it essential for travelers to pack layers to accommodate both the warmer days and the cooler evenings.

September Weather in Pori: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Pori, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pori, September typically has an average temperature of 12°C (54°F), with highs reaching up to 23°C (74°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec292631394859636154453832
Data source: Temperature data for Pori generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Pori

In Pori in September, the precipitation amount is 77 mm (3.0 in) spread over 12 days.

September Precipitation Trends in Pori

The chart displays monthly precipitation patterns in Pori, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Pori, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec434243404150839377886569
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pori

In Pori in September, humidity is 86%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities uncomfortable and travel challenging due to the heavy, muggy atmosphere.

September Average Humidity in Pori

This chart illustrates the average monthly humidity levels in Pori, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Pori is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%89%85%77%78%78%79%86%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pori

In Pori in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Pori, you can check the information here.

Maximum UV Index Levels in Pori for September

The chart shows the monthly maximum UV Index (UVI) for Pori in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Pori typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: Pori September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Pori Compares to Other Months

Weather in Pori varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Pori, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Pori, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)43 mm (1.7 inches)92%low
February Weather-3°C (26°F)42 mm (1.6 inches)90%low
March Weather-1°C (31°F)43 mm (1.7 inches)89%moderate
April Weather4°C (39°F)40 mm (1.6 inches)85%moderate
May Weather9°C (48°F)41 mm (1.6 inches)77%moderate
June Weather15°C (59°F)50 mm (2.0 inches)78%high
July Weather17°C (63°F)83 mm (3.2 inches)78%high
August Weather16°C (61°F)93 mm (3.7 inches)79%moderate
September Weather12°C (54°F)77 mm (3.0 inches)86%moderate
October Weather7°C (45°F)88 mm (3.4 inches)90%low
November Weather3°C (39°F)65 mm (2.6 inches)91%low
December Weather0°C (32°F)69 mm (2.7 inches)89%low

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