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September Weather in Kallby, Finland

Last updated: August 23, 2025

In September, the average temperature in Kallby, Finland hovers around 10°C (51°F). Expect temperature fluctuations, with a minimum of -1°C (31°F) and a maximum of 23°C (74°F). During this month, Kallby typically experiences 74 mm (2.9 in) of precipitation spread across 13 days, contributing to an average humidity of 89%.

September Temperature in Kallby

In September in Kallby, the average temperature is 10°C (51°F). Maximums can reach 23°C (74°F), and minimums can be as low as -1°C (31°F). Pack a variety of clothing to ensure you're prepared for both warm and chilly moments during your travels.

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

The chart illustrates September temperature patterns in Kallby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kallby, September typically has an average temperature of 10°C (51°F), with highs reaching up to 23°C (74°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec242228364658625951423428
Data source: Temperature data for Kallby 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 Kallby

In Kallby in September, the precipitation amount is 74 mm (2.9 in) over the course of 13 days.

September Precipitation Trends in Kallby

The chart displays monthly precipitation patterns in Kallby, 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 Kallby, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec374040384951708974835548
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kallby

In Kallby in September humidity is 89%. With an average temperature of 10°C (51°F), this humidity feels like traveling through a thick fog, where the damp air clings to your skin, making the coolness feel even chillier and adding an element of discomfort to your adventures.

September Average Humidity in Kallby

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

In Kallby 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 Kallby, you can check the information here.

Maximum UV Index Levels in Kallby for September

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

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

This table compares monthly weather conditions in Kallby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)37 mm (1.4 inches)97%low
February Weather-6°C (22°F)40 mm (1.6 inches)95%low
March Weather-2°C (28°F)40 mm (1.6 inches)92%moderate
April Weather2°C (36°F)38 mm (1.5 inches)85%moderate
May Weather8°C (46°F)49 mm (1.9 inches)77%moderate
June Weather14°C (58°F)51 mm (2.0 inches)74%high
July Weather17°C (63°F)70 mm (2.7 inches)79%high
August Weather15°C (59°F)89 mm (3.5 inches)82%moderate
September Weather10°C (51°F)74 mm (2.9 inches)89%moderate
October Weather5°C (42°F)83 mm (3.3 inches)93%low
November Weather1°C (35°F)55 mm (2.2 inches)93%low
December Weather-2°C (28°F)48 mm (1.9 inches)95%low

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