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September Weather in Karttula, Finland

Last updated: August 23, 2025

In September, the average temperature in Karttula, Finland hovers around 10°C (50°F), with a minimum dipped as low as -1°C (30°F) and reaching a maximum of 23°C (74°F). Expect about 91 mm (3.6 in) of precipitation spread across 14 days, contributing to a high average humidity of 91%. Stay prepared for a mix of chilly and wet weather!

September Temperature in Karttula

In September in Karttula, the average temperature is 10°C (50°F). Maximums can reach 23°C (74°F), and minimums can be as low as -1°C (30°F). Be prepared for a range of weather conditions if you're planning to travel during this month.

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

The chart illustrates September temperature patterns in Karttula, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karttula, September typically has an average temperature of 10°C (50°F), with highs reaching up to 23°C (74°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec211926354760635950413325
Data source: Temperature data for Karttula 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 Karttula

In Karttula in September, the precipitation amount is 91 mm (3.6 in) over a span of 14 days.

September Precipitation Trends in Karttula

The chart displays monthly precipitation patterns in Karttula, 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 Karttula, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec494341445459799891867567
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Karttula

In Karttula in September, humidity is 91%. With an average temperature of 10°C (50°F), this humidity feels like an enveloping dampness that makes traveling a bit uncomfortable, as the moisture clings to your skin and dampens your clothes, soaking up any residual warmth from the cool air.

September Average Humidity in Karttula

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

In Karttula 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 Karttula, you can check the information here.

Maximum UV Index Levels in Karttula for September

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

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

This table compares monthly weather conditions in Karttula, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)49 mm (1.9 inches)99%low
February Weather-7°C (20°F)42 mm (1.7 inches)97%low
March Weather-3°C (26°F)41 mm (1.6 inches)95%moderate
April Weather2°C (35°F)44 mm (1.7 inches)87%moderate
May Weather8°C (47°F)54 mm (2.1 inches)78%moderate
June Weather15°C (60°F)59 mm (2.3 inches)74%high
July Weather17°C (63°F)79 mm (3.1 inches)80%high
August Weather15°C (60°F)98 mm (3.9 inches)85%moderate
September Weather10°C (50°F)91 mm (3.6 inches)91%moderate
October Weather5°C (41°F)86 mm (3.4 inches)95%low
November Weather1°C (33°F)75 mm (2.9 inches)94%low
December Weather-4°C (25°F)67 mm (2.6 inches)98%low

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