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September Weather in Haapajaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Haapajaervi, Finland is a refreshing 9°C (49°F). Expect a range from a brisk -4°C (25°F) to a pleasant 23°C (74°F). With 76 mm (3.0 in) of precipitation spread over 13 days, don’t forget your umbrella! The average humidity hovers at a notable 91%, adding to the overall atmospheric feel of the season.

September Temperature in Haapajaervi

In September in Haapajaervi, the average temperature is 9°C (49°F). Maximums can reach 23°C (74°F) and minimums can be as low as -4°C (25°F). Be prepared for a wide range of temperatures, and pack accordingly for your travels!

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

The chart illustrates September temperature patterns in Haapajaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Haapajaervi, 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 (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec211927364759625848393225
Data source: Temperature data for Haapajaervi 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 Haapajaervi

In Haapajaervi in September, the total precipitation amount is 76 mm (3.0 in), which occurs over the course of 13 days.

September Precipitation Trends in Haapajaervi

The chart displays monthly precipitation patterns in Haapajaervi, 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 Haapajaervi, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec404038415956788576826250
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Haapajaervi

In Haapajaervi in September humidity is 91%. With an average temperature of 9°C (49°F), this humidity feels like a chilly mist enveloping you, making travel uncomfortable as the dampness seeps into your clothing and chills you to the bone.

September Average Humidity in Haapajaervi

This chart illustrates the average monthly humidity levels in Haapajaervi, 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 Haapajaervi is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec99%97%95%87%78%74%80%85%91%95%94%98%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Haapajaervi

In Haapajaervi 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 Haapajaervi, you can check the information here.

Maximum UV Index Levels in Haapajaervi for September

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

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

This table compares monthly weather conditions in Haapajaervi, 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)99%low
February Weather-7°C (19°F)40 mm (1.6 inches)97%low
March Weather-3°C (27°F)38 mm (1.5 inches)95%low
April Weather2°C (36°F)41 mm (1.6 inches)87%moderate
May Weather8°C (47°F)59 mm (2.3 inches)78%moderate
June Weather15°C (59°F)56 mm (2.2 inches)74%high
July Weather17°C (62°F)78 mm (3.1 inches)80%high
August Weather14°C (58°F)85 mm (3.4 inches)85%moderate
September Weather9°C (49°F)76 mm (3.0 inches)91%moderate
October Weather4°C (39°F)82 mm (3.2 inches)95%low
November Weather0°C (32°F)62 mm (2.4 inches)94%low
December Weather-4°C (25°F)50 mm (2.0 inches)98%low

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