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September Weather in Perna, Finland

Last updated: August 23, 2025

In Perna, Finland, the average temperature in September hovers around 12°C (53°F). Expect temperatures to range from a chilly -2°C (29°F) to a pleasant 23°C (74°F). The region experiences an average precipitation of 60 mm (2.4 in) over 12 days, leading to a high average humidity of 90%. Prepare accordingly for a blend of cool and damp conditions!

September Temperature in Perna

In September in Perna, the average temperature is 12°C (53°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop to as low as -2°C (29°F). Travelers should be prepared for a wide range of temperatures during this month.

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

The chart illustrates September temperature patterns in Perna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Perna, September typically has an average temperature of 12°C (53°F), with highs reaching up to 23°C (74°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec272530405162656253443730
Data source: Temperature data for Perna 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 Perna

In Perna in September, the precipitation amount is 60 mm (2.4 in) over a span of 12 days.

September Precipitation Trends in Perna

The chart displays monthly precipitation patterns in Perna, 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 Perna, September typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec544948464850677460805875
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Perna

In Perna in September, humidity is 90%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making outdoor adventures uncomfortable and travel plans less appealing.

September Average Humidity in Perna

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

In Perna 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 Perna for better planning.

Maximum UV Index Levels in Perna for September

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

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

This table compares monthly weather conditions in Perna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)54 mm (2.1 inches)98%low
February Weather-4°C (25°F)49 mm (1.9 inches)96%low
March Weather-1°C (31°F)48 mm (1.9 inches)93%moderate
April Weather4°C (40°F)46 mm (1.8 inches)87%moderate
May Weather11°C (51°F)48 mm (1.9 inches)75%moderate
June Weather17°C (62°F)50 mm (2.0 inches)74%high
July Weather18°C (65°F)67 mm (2.6 inches)80%high
August Weather17°C (62°F)74 mm (2.9 inches)85%moderate
September Weather12°C (53°F)60 mm (2.4 inches)90%moderate
October Weather7°C (45°F)80 mm (3.2 inches)94%low
November Weather3°C (37°F)58 mm (2.3 inches)94%low
December Weather-1°C (30°F)75 mm (2.9 inches)96%low

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