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September Weather in Kyyjaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Kyyjaervi, Finland hovers around 9°C (49°F), making it a cool time of year. Temperatures can dip as low as -5°C (23°F), while the warmest days might reach up to 23°C (73°F). Be prepared for some rain, as 78 mm (3.1 in) of precipitation is expected over 15 days. Additionally, with an average humidity of 89%, it’s advisable to dress in layers and bring an umbrella!

September Temperature in Kyyjaervi

In September in Kyyjaervi, the average temperature is 9°C (49°F). Maximum temperatures can reach 23°C (73°F), while minimums can drop as low as -5°C (23°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Kyyjaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kyyjaervi, September typically has an average temperature of 9°C (49°F), with highs reaching up to 23°C (73°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec212027354759625848393225
Data source: Temperature data for Kyyjaervi 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 Kyyjaervi

In Kyyjaervi, in September, the precipitation amount is 78 mm (3.1 in) over a span of 15 days.

September Precipitation Trends in Kyyjaervi

The chart displays monthly precipitation patterns in Kyyjaervi, 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 Kyyjaervi, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec424241466461729278826454
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kyyjaervi

In Kyyjaervi in September, humidity is 89%. With an average temperature of 9°C (49°F), this humidity feels like a persistent dampness that clings to your clothes and skin, making it challenging to stay comfortable while traveling.

September Average Humidity in Kyyjaervi

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

In Kyyjaervi 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 Kyyjaervi, you can check the information here.

Maximum UV Index Levels in Kyyjaervi for September

The chart shows the monthly maximum UV Index (UVI) for Kyyjaervi 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 Kyyjaervi typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: Kyyjaervi 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 Kyyjaervi Compares to Other Months

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

This table compares monthly weather conditions in Kyyjaervi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)42 mm (1.7 inches)97%low
February Weather-7°C (20°F)41 mm (1.6 inches)95%low
March Weather-3°C (27°F)41 mm (1.6 inches)92%moderate
April Weather2°C (35°F)46 mm (1.8 inches)85%moderate
May Weather8°C (47°F)64 mm (2.5 inches)77%moderate
June Weather15°C (59°F)61 mm (2.4 inches)74%high
July Weather16°C (62°F)72 mm (2.8 inches)79%high
August Weather14°C (58°F)92 mm (3.6 inches)82%moderate
September Weather9°C (49°F)78 mm (3.1 inches)89%moderate
October Weather4°C (40°F)82 mm (3.2 inches)93%low
November Weather0°C (33°F)64 mm (2.5 inches)93%low
December Weather-4°C (26°F)54 mm (2.1 inches)95%low

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