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September Weather in Korpo, Finland

Last updated: August 23, 2025

In September, the average temperature in Korpo, Finland hovers around 14°C (57°F), with a minimum of 7°C (45°F) and a comfortable maximum of 20°C (68°F). Expect approximately 80 mm (3.2 in) of precipitation spread over about 12 days, contributing to a high average humidity of 86%. A perfect time to embrace the cozy, rain-kissed atmosphere!

September Temperature in Korpo

In September in Korpo, the average temperature is 14°C (57°F). The maximum can reach 20°C (68°F), while the minimum can be as low as 7°C (45°F). This mild climate makes Korpo an ideal destination for outdoor activities and sightseeing during this time of year.

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

The chart illustrates September temperature patterns in Korpo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Korpo, September typically has an average temperature of 14°C (57°F), with highs reaching up to 20°C (68°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec333032384657636357494336
Data source: Temperature data for Korpo 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 Korpo

In Korpo in September, the precipitation amount is 80 mm (3.2 in) over a span of 12 days.

September Precipitation Trends in Korpo

The chart displays monthly precipitation patterns in Korpo, 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 Korpo, September typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec4941412637334873801097491
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Korpo

In Korpo in September humidity is 86%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket enveloping you, making travel feel oppressive and uncomfortably sticky.

September Average Humidity in Korpo

This chart illustrates the average monthly humidity levels in Korpo, 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 Korpo 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 Korpo

In Korpo in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Korpo for better planning.

Maximum UV Index Levels in Korpo for September

The chart shows the monthly maximum UV Index (UVI) for Korpo 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 Korpo typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Korpo 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 Korpo Compares to Other Months

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

This table compares monthly weather conditions in Korpo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)49 mm (1.9 inches)92%low
February Weather-1°C (30°F)41 mm (1.6 inches)90%low
March Weather0°C (32°F)41 mm (1.6 inches)89%moderate
April Weather3°C (38°F)26 mm (1.0 inches)85%moderate
May Weather8°C (46°F)37 mm (1.4 inches)77%moderate
June Weather14°C (58°F)33 mm (1.3 inches)78%high
July Weather17°C (63°F)48 mm (1.9 inches)78%high
August Weather17°C (63°F)73 mm (2.9 inches)79%moderate
September Weather14°C (57°F)80 mm (3.2 inches)86%moderate
October Weather9°C (49°F)108 mm (4.3 inches)90%low
November Weather6°C (43°F)74 mm (2.9 inches)91%low
December Weather2°C (36°F)91 mm (3.6 inches)89%low

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