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September Weather in Kalvola, Finland

Last updated: August 23, 2025

In September, the average temperature in Kalvola, Finland hovers around 11°C (52°F), making it a mild time of year. Expect a minimum chill of -2°C (29°F), while temperatures can peak at a comfortable 23°C (74°F). With 63 mm (2.5 in) of precipitation spread over 13 days, you might want to keep an umbrella handy. The air feels quite humid, with an average humidity of 90%, creating a distinctly fresh atmosphere.

September Temperature in Kalvola

In September in Kalvola, the average temperature is 11°C (52°F). The maximum can reach 23°C (74°F) and the minimum can be as low as -2°C (29°F). Be sure to pack layers to stay comfortable during your travels!

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

The chart illustrates September temperature patterns in Kalvola, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kalvola, September typically has an average temperature of 11°C (52°F), with highs reaching up to 23°C (74°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec262429385061636052433629
Data source: Temperature data for Kalvola 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 Kalvola

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

September Precipitation Trends in Kalvola

The chart displays monthly precipitation patterns in Kalvola, 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 Kalvola, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec484143445868828263775262
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kalvola

In Kalvola 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 Kalvola

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

In Kalvola 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 Kalvola, you can check the information here.

Maximum UV Index Levels in Kalvola for September

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

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

This table compares monthly weather conditions in Kalvola, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)48 mm (1.9 inches)97%low
February Weather-5°C (24°F)41 mm (1.6 inches)95%low
March Weather-2°C (30°F)43 mm (1.7 inches)93%moderate
April Weather3°C (38°F)44 mm (1.7 inches)86%moderate
May Weather10°C (50°F)58 mm (2.3 inches)75%moderate
June Weather16°C (61°F)68 mm (2.7 inches)75%high
July Weather17°C (63°F)82 mm (3.2 inches)80%high
August Weather16°C (60°F)82 mm (3.2 inches)83%moderate
September Weather11°C (52°F)63 mm (2.5 inches)90%moderate
October Weather6°C (43°F)77 mm (3.0 inches)93%low
November Weather2°C (36°F)52 mm (2.0 inches)94%low
December Weather-2°C (29°F)62 mm (2.4 inches)95%low

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