September Weather in Lemi, Finland

Last updated: August 23, 2025

In September, the average temperature in Lemi, Finland is a mild 11°C (52°F). During this time, you can expect temperatures to range from a cool 0°C (32°F) to a pleasant 22°C (73°F). Rainfall averages around 66 mm (2.6 in) across 12 days, contributing to a notably high average humidity of 90%. Be prepared for a mix of cozy and wet days!

September Temperature in Lemi

In September in Lemi, the average temperature is 11°C (52°F). Maximums can reach 22°C (73°F) and minimums can be as low as 0°C (32°F). This variation in temperature makes it essential for travelers to pack layers to stay comfortable throughout the day.

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

The chart illustrates September temperature patterns in Lemi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lemi, September typically has an average temperature of 11°C (52°F), with highs reaching up to 22°C (73°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Lemi

In Lemi in September, the precipitation amount is 66 mm (2.6 in) over the course of 12 days.

September Precipitation Trends in Lemi

The chart displays monthly precipitation patterns in Lemi, 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 Lemi, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 12 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 Lemi

In Lemi 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 Lemi

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

In Lemi 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 Lemi, you can check the information here.

Maximum UV Index Levels in Lemi for September

The chart shows the monthly maximum UV Index (UVI) for Lemi 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 Lemi typically reaches 3, which falls under the moderate exposure category.

Data source: Lemi 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 Lemi Compares to Other Months

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

This table compares monthly weather conditions in Lemi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (24°F)	49 mm (1.9 inches)	98%	low
February Weather	-5°C (23°F)	53 mm (2.1 inches)	96%	low
March Weather	-2°C (29°F)	47 mm (1.8 inches)	93%	moderate
April Weather	3°C (38°F)	45 mm (1.8 inches)	88%	moderate
May Weather	10°C (50°F)	56 mm (2.2 inches)	77%	moderate
June Weather	16°C (61°F)	57 mm (2.3 inches)	75%	high
July Weather	18°C (64°F)	81 mm (3.2 inches)	82%	high
August Weather	16°C (61°F)	88 mm (3.5 inches)	84%	moderate
September Weather	11°C (52°F)	66 mm (2.6 inches)	90%	moderate
October Weather	6°C (43°F)	75 mm (3.0 inches)	93%	low
November Weather	2°C (36°F)	50 mm (2.0 inches)	93%	low
December Weather	-3°C (28°F)	72 mm (2.8 inches)	95%	low