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September Weather in Kortesjaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Kortesjaervi, Finland hovers around 10°C (50°F), with a minimum dipping to -3°C (27°F) and a maximum soaring to 23°C (74°F). Expect about 70 mm (2.7 in) of precipitation over 13 days, contributing to a notably high average humidity level of 89%.

September Temperature in Kortesjaervi

In September in Kortesjaervi, the average temperature is 10°C (50°F). Maximums can reach 23°C (74°F), while minimums can be as low as -3°C (27°F). Be prepared for a mix of mild days and chilly nights if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Kortesjaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kortesjaervi, September typically has an average temperature of 10°C (50°F), with highs reaching up to 23°C (74°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec232128374859635950413327
Data source: Temperature data for Kortesjaervi 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 Kortesjaervi

In Kortesjaervi in September, the precipitation amount is 70 mm (2.7 in) over the course of 13 days.

September Precipitation Trends in Kortesjaervi

The chart displays monthly precipitation patterns in Kortesjaervi, 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 Kortesjaervi, September typically receives around 70 mm (2.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec374041446156638870865847
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kortesjaervi

In Kortesjaervi in September, humidity is 89%. With an average temperature of 10°C (50°F), this humidity feels like a dense blanket wrapping around you, making travel feel damp and chilly, and urging you to dress in layers for comfort.

September Average Humidity in Kortesjaervi

This chart illustrates the average monthly humidity levels in Kortesjaervi, 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 Kortesjaervi is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%92%85%77%74%79%82%89%93%93%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kortesjaervi

In Kortesjaervi 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 Kortesjaervi, you can check the information here.

Maximum UV Index Levels in Kortesjaervi for September

The chart shows the monthly maximum UV Index (UVI) for Kortesjaervi 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 Kortesjaervi typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112456653211
Data source: Kortesjaervi 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 Kortesjaervi Compares to Other Months

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

This table compares monthly weather conditions in Kortesjaervi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)37 mm (1.5 inches)97%low
February Weather-6°C (22°F)40 mm (1.6 inches)95%low
March Weather-2°C (28°F)41 mm (1.6 inches)92%low
April Weather3°C (37°F)44 mm (1.7 inches)85%moderate
May Weather9°C (48°F)61 mm (2.4 inches)77%moderate
June Weather15°C (60°F)56 mm (2.2 inches)74%high
July Weather17°C (63°F)63 mm (2.5 inches)79%high
August Weather15°C (59°F)88 mm (3.5 inches)82%moderate
September Weather10°C (50°F)70 mm (2.7 inches)89%moderate
October Weather5°C (41°F)86 mm (3.4 inches)93%low
November Weather1°C (34°F)58 mm (2.3 inches)93%low
December Weather-3°C (27°F)47 mm (1.8 inches)95%low

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