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September Weather in Heinola, Finland

Last updated: August 23, 2025

In September, the average temperature in Heinola, Finland hovers around 11°C (52°F), providing a cool yet comfortable atmosphere. Expect temperatures to range from a chilly 0°C (33°F) to a pleasant 22°C (72°F). Be prepared for some precipitation, as 64 mm (2.5 in) of rain typically falls over 11 days, coupled with a high average humidity of 90%. Embrace the refreshing ambiance of September!

September Temperature in Heinola

In September in Heinola, the average temperature is 11°C (52°F). Maximums can reach 22°C (72°F), while minimums can drop as low as 0°C (33°F). This makes it a great time for travelers to enjoy mild weather and explore outdoor activities.

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

The chart illustrates September temperature patterns in Heinola, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heinola, September typically has an average temperature of 11°C (52°F), with highs reaching up to 22°C (72°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec242329374860636052433628
Data source: Temperature data for Heinola 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 Heinola

In Heinola in September, the total precipitation amount is 64 mm (2.5 in) spread over 11 days.

September Precipitation Trends in Heinola

The chart displays monthly precipitation patterns in Heinola, 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 Heinola, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec474443475662808764775469
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Heinola

In Heinola in September, humidity is 90%. With an average temperature of 11°C (52°F), this humidity feels like a heavy blanket that clings to your skin, making travel uncomfortable and muggy.

September Average Humidity in Heinola

This chart illustrates the average monthly humidity levels in Heinola, 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 Heinola is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec98%96%93%87%75%74%80%85%90%94%94%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Heinola

In Heinola 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 Heinola, you can check the information here.

Maximum UV Index Levels in Heinola for September

The chart shows the monthly maximum UV Index (UVI) for Heinola 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 Heinola typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456753211
Data source: Heinola 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 Heinola Compares to Other Months

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

This table compares monthly weather conditions in Heinola, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)47 mm (1.9 inches)98%low
February Weather-5°C (23°F)44 mm (1.7 inches)96%low
March Weather-2°C (29°F)43 mm (1.7 inches)93%moderate
April Weather3°C (38°F)47 mm (1.8 inches)87%moderate
May Weather9°C (49°F)56 mm (2.2 inches)75%moderate
June Weather15°C (60°F)62 mm (2.5 inches)74%high
July Weather17°C (63°F)80 mm (3.1 inches)80%high
August Weather16°C (61°F)87 mm (3.4 inches)85%moderate
September Weather11°C (52°F)64 mm (2.5 inches)90%moderate
October Weather6°C (43°F)77 mm (3.0 inches)94%low
November Weather2°C (36°F)54 mm (2.1 inches)94%low
December Weather-2°C (28°F)69 mm (2.7 inches)96%low

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