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September Weather in Reisjaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Reisjaervi, Finland hovers around 9°C (49°F). Expect a chilly minimum of -4°C (24°F), but enjoy warmer days with a maximum of 23°C (74°F). The month brings approximately 78 mm (3.1 in) of precipitation over 13 days, contributing to a notable average humidity of 89%.

September Temperature in Reisjaervi

In September in Reisjaervi, the average temperature is 9°C (49°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -4°C (24°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in Reisjaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Reisjaervi, September typically has an average temperature of 9°C (49°F), with highs reaching up to 23°C (74°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec211927354759625848393225
Data source: Temperature data for Reisjaervi 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 Reisjaervi

In Reisjaervi in September, the precipitation amount is 78 mm (3.1 in) spread over 13 days.

September Precipitation Trends in Reisjaervi

The chart displays monthly precipitation patterns in Reisjaervi, 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 Reisjaervi, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec404039446256779078856351
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Reisjaervi

In Reisjaervi 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 Reisjaervi

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

In Reisjaervi 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 Reisjaervi, you can check the information here.

Maximum UV Index Levels in Reisjaervi for September

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

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

This table compares monthly weather conditions in Reisjaervi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)40 mm (1.6 inches)97%low
February Weather-7°C (20°F)40 mm (1.6 inches)95%low
March Weather-3°C (27°F)39 mm (1.5 inches)92%low
April Weather2°C (36°F)44 mm (1.7 inches)85%moderate
May Weather8°C (47°F)62 mm (2.4 inches)77%moderate
June Weather15°C (59°F)56 mm (2.2 inches)74%high
July Weather16°C (62°F)77 mm (3.0 inches)79%high
August Weather14°C (58°F)90 mm (3.5 inches)82%moderate
September Weather9°C (49°F)78 mm (3.1 inches)89%moderate
October Weather4°C (39°F)85 mm (3.4 inches)93%low
November Weather0°C (32°F)63 mm (2.5 inches)93%low
December Weather-4°C (25°F)51 mm (2.0 inches)95%low

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