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September Weather in Lumijoki, Finland

Last updated: August 23, 2025

In September, the average temperature in Lumijoki, Finland hovers around 9°C (49°F), with a minimum dipping to -6°C (21°F) and a pleasant maximum reaching 24°C (75°F). Expect about 71 mm (2.8 in) of precipitation spread over 12 days, contributing to an average humidity of 90%.

September Temperature in Lumijoki

In September in Lumijoki, the average temperature is 9°C (49°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop as low as -6°C (21°F). Be prepared for a wide range of temperatures when traveling, so pack accordingly!

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

The chart illustrates September temperature patterns in Lumijoki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lumijoki, September typically has an average temperature of 9°C (49°F), with highs reaching up to 24°C (75°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec191825344657625849393124
Data source: Temperature data for Lumijoki 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 Lumijoki

In Lumijoki in September, the precipitation amount is 71 mm (2.8 in) during a total of 12 days.

September Precipitation Trends in Lumijoki

The chart displays monthly precipitation patterns in Lumijoki, 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 Lumijoki, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec373737375356789671785952
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lumijoki

In Lumijoki in September humidity is 90%. With an average temperature of 9°C (49°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less enjoyable and necessitating extra layers to stay warm and comfortable while traveling.

September Average Humidity in Lumijoki

This chart illustrates the average monthly humidity levels in Lumijoki, 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 Lumijoki is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec100%98%95%87%81%77%79%84%90%95%95%99%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lumijoki

In Lumijoki 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 Lumijoki, you can check the information here.

Maximum UV Index Levels in Lumijoki for September

The chart shows the monthly maximum UV Index (UVI) for Lumijoki 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 Lumijoki typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113446643211
Data source: Lumijoki 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 Lumijoki Compares to Other Months

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

This table compares monthly weather conditions in Lumijoki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)37 mm (1.4 inches)100%low
February Weather-8°C (18°F)37 mm (1.4 inches)98%low
March Weather-4°C (26°F)37 mm (1.5 inches)95%moderate
April Weather1°C (34°F)37 mm (1.5 inches)87%moderate
May Weather8°C (46°F)53 mm (2.1 inches)81%moderate
June Weather14°C (58°F)56 mm (2.2 inches)77%high
July Weather17°C (62°F)78 mm (3.1 inches)79%high
August Weather14°C (58°F)96 mm (3.8 inches)84%moderate
September Weather9°C (49°F)71 mm (2.8 inches)90%moderate
October Weather4°C (40°F)78 mm (3.1 inches)95%low
November Weather0°C (31°F)59 mm (2.3 inches)95%low
December Weather-4°C (25°F)52 mm (2.0 inches)99%low

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