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September Weather in Rantsila, Finland

Last updated: August 23, 2025

In September, the average temperature in Rantsila, Finland hovers around 9°C (49°F). However, temperatures can vary widely, with minimums plunging to -7°C (19°F) and maximums reaching a pleasant 24°C (76°F). Expect 76 mm (3.0 in) of precipitation spread over 13 days, contributing to a high average humidity of 90%.

September Temperature in Rantsila

In September in Rantsila, the average temperature is 9°C (49°F). Maximums can reach 24°C (76°F), while minimums can drop to as low as -7°C (19°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

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

The chart illustrates September temperature patterns in Rantsila, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rantsila, September typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (76°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec191825354658625748393024
Data source: Temperature data for Rantsila 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 Rantsila

In Rantsila in September, the total precipitation amount is 76 mm (3.0 in), which occurs over the course of 13 days.

September Precipitation Trends in Rantsila

The chart displays monthly precipitation patterns in Rantsila, 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 Rantsila, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec393838435658909376796252
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rantsila

In Rantsila in September humidity is 90%. With an average temperature of 9°C (49°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less enjoyable and necessitating extra layers to stay warm and comfortable while traveling.

September Average Humidity in Rantsila

This chart illustrates the average monthly humidity levels in Rantsila, 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 Rantsila is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec100%98%95%87%81%77%79%84%90%95%95%99%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rantsila

In Rantsila 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 Rantsila, you can check the information here.

Maximum UV Index Levels in Rantsila for September

The chart shows the monthly maximum UV Index (UVI) for Rantsila 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 Rantsila typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113446643211
Data source: Rantsila 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 Rantsila Compares to Other Months

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

This table compares monthly weather conditions in Rantsila, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)39 mm (1.5 inches)100%low
February Weather-8°C (18°F)38 mm (1.5 inches)98%low
March Weather-4°C (26°F)38 mm (1.5 inches)95%moderate
April Weather2°C (35°F)43 mm (1.7 inches)87%moderate
May Weather8°C (47°F)56 mm (2.2 inches)81%moderate
June Weather14°C (58°F)58 mm (2.3 inches)77%high
July Weather16°C (62°F)89 mm (3.5 inches)79%high
August Weather14°C (58°F)93 mm (3.7 inches)84%moderate
September Weather9°C (49°F)76 mm (3.0 inches)90%moderate
October Weather4°C (39°F)79 mm (3.1 inches)95%low
November Weather-1°C (31°F)62 mm (2.4 inches)95%low
December Weather-4°C (24°F)52 mm (2.0 inches)99%low

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