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September Weather in Valkeakoski, Finland

Last updated: August 23, 2025

In Valkeakoski, Finland, the average temperature in September hovers around 11°C (52°F). Expect a chill in the air, with minimums dipping to -1°C (31°F) and highs reaching 22°C (73°F). Be prepared for a bit of rain, as 63 mm (2.5 in) of precipitation typically falls over 13 days. With an average humidity of 90%, it's a month that truly captures the essence of a crisp and refreshing atmosphere.

September Temperature in Valkeakoski

In September in Valkeakoski, the average temperature is 11°C (52°F), with maximums reaching 22°C (73°F) and minimums dropping as low as -1°C (31°F). This makes it a great time to pack layers and enjoy the varied weather while exploring the area.

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

The chart illustrates September temperature patterns in Valkeakoski, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valkeakoski, September typically has an average temperature of 11°C (52°F), with highs reaching up to 22°C (73°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec252429384960636052433629
Data source: Temperature data for Valkeakoski 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 Valkeakoski

In Valkeakoski in September, the precipitation amount is 63 mm (2.5 in) spread over 13 days.

September Precipitation Trends in Valkeakoski

The chart displays monthly precipitation patterns in Valkeakoski, 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 Valkeakoski, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec463941445771798363765462
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Valkeakoski

In Valkeakoski in September, humidity is 90%. With an average temperature of 11°C (52°F), this humidity feels like a heavy blanket that clings to your skin, making travel uncomfortable and muggy.

September Average Humidity in Valkeakoski

This chart illustrates the average monthly humidity levels in Valkeakoski, 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 Valkeakoski is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%93%87%75%75%80%83%90%93%94%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Valkeakoski

In Valkeakoski 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 Valkeakoski, you can check the information here.

Maximum UV Index Levels in Valkeakoski for September

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

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

This table compares monthly weather conditions in Valkeakoski, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)46 mm (1.8 inches)97%low
February Weather-5°C (24°F)39 mm (1.5 inches)95%low
March Weather-2°C (30°F)41 mm (1.6 inches)93%moderate
April Weather3°C (38°F)44 mm (1.7 inches)86%moderate
May Weather10°C (50°F)57 mm (2.2 inches)75%moderate
June Weather16°C (61°F)71 mm (2.8 inches)75%high
July Weather17°C (63°F)79 mm (3.1 inches)80%high
August Weather16°C (61°F)83 mm (3.3 inches)83%moderate
September Weather11°C (52°F)63 mm (2.5 inches)90%moderate
October Weather6°C (43°F)76 mm (3.0 inches)93%low
November Weather2°C (36°F)54 mm (2.1 inches)94%low
December Weather-2°C (29°F)62 mm (2.4 inches)95%low

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