September Weather in Karjalohja, Finland

Last updated: August 23, 2025

In Karjalohja, Finland, the average temperature in September hovers around 12°C (54°F). Expect a minimum temperature of -2°C (29°F) and a maximum of 23°C (73°F). It’s also a relatively wet month, with 63 mm (2.5 in) of precipitation spread over 13 days. The atmosphere is quite humid, with an average humidity level of 90%.

September Temperature in Karjalohja

In September in Karjalohja, the average temperature is 12°C (54°F). The maximum can reach 23°C (73°F), while the minimum can drop as low as -2°C (29°F). Be prepared for a mix of mild and chilly weather, making it ideal for layering during your travels.

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

The chart illustrates September temperature patterns in Karjalohja, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karjalohja, September typically has an average temperature of 12°C (54°F), with highs reaching up to 23°C (73°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Karjalohja

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

September Precipitation Trends in Karjalohja

The chart displays monthly precipitation patterns in Karjalohja, 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 Karjalohja, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 13 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Karjalohja

In Karjalohja in September, humidity is 90%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and traveling a bit more draining than usual.

September Average Humidity in Karjalohja

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

In Karjalohja 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 Karjalohja for better planning.

Maximum UV Index Levels in Karjalohja for September

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

Data source: Karjalohja 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 Karjalohja Compares to Other Months

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

This table compares monthly weather conditions in Karjalohja, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	56 mm (2.2 inches)	97%	low
February Weather	-3°C (26°F)	48 mm (1.9 inches)	95%	low
March Weather	-1°C (31°F)	52 mm (2.0 inches)	93%	moderate
April Weather	4°C (39°F)	38 mm (1.5 inches)	86%	moderate
May Weather	10°C (50°F)	53 mm (2.1 inches)	75%	moderate
June Weather	16°C (61°F)	52 mm (2.1 inches)	75%	high
July Weather	18°C (64°F)	82 mm (3.2 inches)	80%	high
August Weather	16°C (62°F)	88 mm (3.5 inches)	83%	moderate
September Weather	12°C (54°F)	63 mm (2.5 inches)	90%	moderate
October Weather	7°C (45°F)	87 mm (3.4 inches)	93%	low
November Weather	3°C (38°F)	61 mm (2.4 inches)	94%	low
December Weather	-1°C (31°F)	73 mm (2.9 inches)	95%	low