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September Weather in Kaarina, Finland

Last updated: August 23, 2025

In Kaarina, Finland, the average temperature for September hovers around 12°C (54°F). Expect minimums as low as -3°C (28°F) and peaking at a comfortable 23°C (74°F). Throughout the month, you'll encounter approximately 69 mm (2.7 in) of precipitation spread over 12 days, contributing to an average humidity level of a humid 86%.

September Temperature in Kaarina

In September in Kaarina, the average temperature is 12°C (54°F), with maximums reaching up to 23°C (74°F) and minimums dropping as low as -3°C (28°F). This diverse temperature range makes Kaarina a great destination for travelers looking to experience both mild and cooler weather.

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

The chart illustrates September temperature patterns in Kaarina, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kaarina, 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 -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec282631405061646153453831
Data source: Temperature data for Kaarina 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 Kaarina

In Kaarina in September, the precipitation amount is 69 mm (2.7 in) over the span of 12 days.

September Precipitation Trends in Kaarina

The chart displays monthly precipitation patterns in Kaarina, 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 Kaarina, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec484245344845859569785474
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kaarina

In Kaarina 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 Kaarina

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

In Kaarina 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 Kaarina for better planning.

Maximum UV Index Levels in Kaarina for September

The chart shows the monthly maximum UV Index (UVI) for Kaarina 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 Kaarina typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123457754211
Data source: Kaarina 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 Kaarina Compares to Other Months

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

This table compares monthly weather conditions in Kaarina, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)48 mm (1.9 inches)92%low
February Weather-3°C (26°F)42 mm (1.7 inches)90%low
March Weather0°C (31°F)45 mm (1.8 inches)89%moderate
April Weather4°C (40°F)34 mm (1.3 inches)85%moderate
May Weather10°C (50°F)48 mm (1.9 inches)77%moderate
June Weather16°C (61°F)45 mm (1.8 inches)78%high
July Weather18°C (64°F)85 mm (3.4 inches)78%high
August Weather16°C (62°F)95 mm (3.7 inches)79%moderate
September Weather12°C (54°F)69 mm (2.7 inches)86%moderate
October Weather7°C (45°F)78 mm (3.1 inches)90%low
November Weather3°C (38°F)54 mm (2.1 inches)91%low
December Weather0°C (31°F)74 mm (2.9 inches)89%low

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