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September Weather in Oulunsalo, Finland

Last updated: August 23, 2025

In September, the average temperature in Oulunsalo, Finland is a brisk 10°C (49°F). Expect a wide range, with minimums dipping to -4°C (24°F) and maximums soaring to 24°C (75°F). This month, 71 mm (2.8 in) of precipitation is anticipated over about 13 days, bringing with it a high average humidity of 90%.

September Temperature in Oulunsalo

In September in Oulunsalo, the average temperature is 10°C (49°F). Maximums can reach 24°C (75°F), while minimums can drop to as low as -4°C (24°F). This makes Oulunsalo an ideal destination for travelers seeking a diverse range of weather experiences during their visit.

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

The chart illustrates September temperature patterns in Oulunsalo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oulunsalo, September typically has an average temperature of 10°C (49°F), with highs reaching up to 24°C (75°F) and lows dropping to around -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec191725334558635849393124
Data source: Temperature data for Oulunsalo 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 Oulunsalo

In Oulunsalo in September, the total precipitation amount is 71 mm (2.8 in) occurring over the course of 13 days.

September Precipitation Trends in Oulunsalo

The chart displays monthly precipitation patterns in Oulunsalo, 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 Oulunsalo, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec404041384960739271816258
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oulunsalo

In Oulunsalo in September, humidity is 90%. With an average temperature of 10°C (49°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and leaving you longing for dry, warm respite.

September Average Humidity in Oulunsalo

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

In Oulunsalo 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 Oulunsalo, you can check the information here.

Maximum UV Index Levels in Oulunsalo for September

The chart shows the monthly maximum UV Index (UVI) for Oulunsalo 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 Oulunsalo typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112346643211
Data source: Oulunsalo 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 Oulunsalo Compares to Other Months

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

This table compares monthly weather conditions in Oulunsalo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)40 mm (1.6 inches)100%low
February Weather-8°C (17°F)40 mm (1.6 inches)98%low
March Weather-4°C (25°F)41 mm (1.6 inches)95%low
April Weather1°C (34°F)38 mm (1.5 inches)87%moderate
May Weather7°C (45°F)49 mm (1.9 inches)81%moderate
June Weather14°C (58°F)60 mm (2.4 inches)77%high
July Weather17°C (63°F)73 mm (2.9 inches)79%high
August Weather14°C (58°F)91 mm (3.6 inches)84%moderate
September Weather10°C (49°F)71 mm (2.8 inches)90%moderate
October Weather4°C (40°F)81 mm (3.2 inches)95%low
November Weather-1°C (31°F)62 mm (2.4 inches)95%low
December Weather-5°C (24°F)58 mm (2.3 inches)99%low

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