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September Weather in Simpele, Finland

Last updated: August 23, 2025

In Simpele, Finland, the average temperature in September hovers around 11°C (51°F). Expect a chill as low as -1°C (31°F) at night, while daytime can warm up to a pleasant 24°C (75°F). With a precipitation amount of 74 mm (2.9 in) over 12 days, and an average humidity level of 90%, be prepared for a mix of rain and steamy days.

September Temperature in Simpele

In September in Simpele, the average temperature is 11°C (51°F). The maximum can reach 24°C (75°F), while the minimum can be as low as -1°C (31°F). Overall, this month offers a comfortable climate for travelers who enjoy mild weather and are prepared for temperature fluctuations.

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

The chart illustrates September temperature patterns in Simpele, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simpele, September typically has an average temperature of 11°C (51°F), with highs reaching up to 24°C (75°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec232128375061636051423425
Data source: Temperature data for Simpele 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 Simpele

In Simpele in September, the precipitation amount is 74 mm (2.9 in) over a span of 12 days.

September Precipitation Trends in Simpele

The chart displays monthly precipitation patterns in Simpele, 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 Simpele, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec455147485659808774734873
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Simpele

In Simpele in September, humidity is 90%. With an average temperature of 11°C (51°F), this humidity feels like a damp blanket wrapping around you, making traveling uncomfortable and sticky, as every step leaves you feeling sluggish and clinging to the air.

September Average Humidity in Simpele

This chart illustrates the average monthly humidity levels in Simpele, 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 Simpele is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec98%96%93%88%77%76%82%84%90%93%93%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Simpele

In Simpele 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 Simpele, you can check the information here.

Maximum UV Index Levels in Simpele for September

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

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

This table compares monthly weather conditions in Simpele, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)45 mm (1.8 inches)98%low
February Weather-6°C (22°F)51 mm (2.0 inches)96%low
March Weather-2°C (28°F)47 mm (1.8 inches)93%moderate
April Weather3°C (37°F)48 mm (1.9 inches)88%moderate
May Weather10°C (50°F)56 mm (2.2 inches)77%moderate
June Weather16°C (61°F)59 mm (2.3 inches)75%high
July Weather17°C (64°F)80 mm (3.1 inches)82%high
August Weather16°C (61°F)87 mm (3.4 inches)84%moderate
September Weather11°C (51°F)74 mm (2.9 inches)90%moderate
October Weather5°C (42°F)72 mm (2.9 inches)93%low
November Weather1°C (34°F)48 mm (1.9 inches)93%low
December Weather-4°C (26°F)73 mm (2.9 inches)95%low

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