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September Weather in Jalasjaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Jalasjaervi, Finland hovers around 10°C (50°F). Expect cool evenings with a minimum of -4°C (26°F), while daytime highs can reach up to 24°C (75°F). Be prepared for some damp days, as 69 mm (2.7 in) of precipitation is expected over 13 days, contributing to a high average humidity of 89%.

September Temperature in Jalasjaervi

In September in Jalasjaervi, the average temperature is 10°C (50°F), with a maximum that can reach 24°C (75°F) and a minimum that can drop as low as -4°C (26°F). Be prepared for a wide range of temperatures when traveling to Jalasjaervi this month.

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

The chart illustrates September temperature patterns in Jalasjaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jalasjaervi, September typically has an average temperature of 10°C (50°F), with highs reaching up to 24°C (75°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec242229384860625950413427
Data source: Temperature data for Jalasjaervi 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 Jalasjaervi

In Jalasjaervi in September, the precipitation amount is 69 mm (2.7 in) over the course of 13 days.

September Precipitation Trends in Jalasjaervi

The chart displays monthly precipitation patterns in Jalasjaervi, 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 Jalasjaervi, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec383943445860579269695951
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jalasjaervi

In Jalasjaervi 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 Jalasjaervi

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

In Jalasjaervi 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 Jalasjaervi, you can check the information here.

Maximum UV Index Levels in Jalasjaervi for September

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

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

This table compares monthly weather conditions in Jalasjaervi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)38 mm (1.5 inches)97%low
February Weather-5°C (22°F)39 mm (1.5 inches)95%low
March Weather-2°C (29°F)43 mm (1.7 inches)92%moderate
April Weather3°C (38°F)44 mm (1.7 inches)85%moderate
May Weather9°C (49°F)58 mm (2.3 inches)77%moderate
June Weather15°C (60°F)60 mm (2.4 inches)74%high
July Weather17°C (62°F)57 mm (2.2 inches)79%high
August Weather15°C (59°F)92 mm (3.6 inches)82%moderate
September Weather10°C (50°F)69 mm (2.7 inches)89%moderate
October Weather5°C (41°F)69 mm (2.7 inches)93%low
November Weather1°C (34°F)59 mm (2.3 inches)93%low
December Weather-3°C (28°F)51 mm (2.0 inches)95%low

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