September Weather in Karkkila, Finland

Last updated: August 23, 2025

In Karkkila, Finland, the average temperature for September hovers around 11°C (53°F), with a chilly minimum of -3°C (28°F) and a pleasant maximum of 23°C (75°F). Expect about 65 mm (2.6 in) of precipitation spread over 13 days, accompanied by a high average humidity of 90%. Stay prepared for a mix of cool and comfortable days!

September Temperature in Karkkila

In September in Karkkila, the average temperature is 11°C (53°F). Maximums can reach 23°C (75°F), while minimums can drop as low as -3°C (28°F). Be prepared for a mix of mild and chilly weather during your travels.

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

The chart illustrates September temperature patterns in Karkkila, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karkkila, September typically has an average temperature of 11°C (53°F), with highs reaching up to 23°C (75°F) and lows dropping to around -3°C (28°F).

Data source: Temperature data for Karkkila generated using information from the Copernicus Climate Change Service.

September Precipitation in Karkkila

In Karkkila in September, the precipitation amount is 65 mm (2.6 in) spread over a duration of 13 days.

September Precipitation Trends in Karkkila

The chart displays monthly precipitation patterns in Karkkila, 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 Karkkila, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Karkkila

In Karkkila in September, humidity is 90%. With an average temperature of 11°C (53°F), this humidity feels like a heavy cloak, making traveling feel sticky and exhausting, as the dampness clings to your skin and the chill in the air sharpens the discomfort, leaving you longing for a breath of fresh, dry air.

September Average Humidity in Karkkila

This chart illustrates the average monthly humidity levels in Karkkila, 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 Karkkila is approximately 90%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Karkkila

In Karkkila in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Karkkila for better planning.

Maximum UV Index Levels in Karkkila for September

The chart shows the monthly maximum UV Index (UVI) for Karkkila 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 Karkkila typically reaches 4, which falls under the moderate exposure category.

Data source: Karkkila 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 Karkkila Compares to Other Months

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

This table compares monthly weather conditions in Karkkila, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	54 mm (2.1 inches)	97%	low
February Weather	-4°C (25°F)	47 mm (1.8 inches)	95%	low
March Weather	-1°C (30°F)	50 mm (2.0 inches)	93%	moderate
April Weather	3°C (38°F)	43 mm (1.7 inches)	86%	moderate
May Weather	10°C (50°F)	59 mm (2.3 inches)	75%	moderate
June Weather	16°C (61°F)	61 mm (2.4 inches)	75%	high
July Weather	18°C (64°F)	89 mm (3.5 inches)	80%	high
August Weather	16°C (61°F)	83 mm (3.3 inches)	83%	moderate
September Weather	11°C (53°F)	65 mm (2.6 inches)	90%	moderate
October Weather	6°C (44°F)	82 mm (3.2 inches)	93%	low
November Weather	2°C (37°F)	56 mm (2.2 inches)	94%	low
December Weather	-2°C (29°F)	70 mm (2.7 inches)	95%	low