September Weather in Lappajaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Lappajaervi, Finland is a brisk 10°C (50°F), with temperatures ranging from a chilly -4°C (25°F) to a delightful 23°C (73°F). Expect 72 mm (2.8 in) of precipitation over about 14 days, accompanied by high humidity levels averaging 89%. Prepare for a variety of weather conditions!

September Temperature in Lappajaervi

In September in Lappajaervi, the average temperature is 10°C (50°F). The maximum can reach 23°C (73°F) and the minimum can be as low as -4°C (25°F). Travelers should be prepared for a wide range of temperatures, ensuring to pack layers for both warm and chilly conditions.

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

The chart illustrates September temperature patterns in Lappajaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lappajaervi, September typically has an average temperature of 10°C (50°F), with highs reaching up to 23°C (73°F) and lows dropping to around -4°C (25°F).

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

September Precipitation in Lappajaervi

In Lappajaervi in September, the total precipitation amount is 72 mm (2.8 in) spread over the course of 14 days.

September Precipitation Trends in Lappajaervi

The chart displays monthly precipitation patterns in Lappajaervi, 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 Lappajaervi, September typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 14 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 Lappajaervi

In Lappajaervi in September, humidity is 89%. With an average temperature of 10°C (50°F), this humidity feels like a dense blanket wrapping around you, making travel feel damp and chilly, and urging you to dress in layers for comfort.

September Average Humidity in Lappajaervi

This chart illustrates the average monthly humidity levels in Lappajaervi, 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 Lappajaervi is approximately 89%, 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 Lappajaervi

In Lappajaervi 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 Lappajaervi, you can check the information here.

Maximum UV Index Levels in Lappajaervi for September

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

Data source: Lappajaervi 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 Lappajaervi Compares to Other Months

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

This table compares monthly weather conditions in Lappajaervi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	38 mm (1.5 inches)	97%	low
February Weather	-6°C (21°F)	40 mm (1.6 inches)	95%	low
March Weather	-3°C (28°F)	41 mm (1.6 inches)	92%	moderate
April Weather	2°C (36°F)	45 mm (1.8 inches)	85%	moderate
May Weather	9°C (48°F)	62 mm (2.4 inches)	77%	moderate
June Weather	15°C (60°F)	56 mm (2.2 inches)	74%	high
July Weather	17°C (62°F)	66 mm (2.6 inches)	79%	high
August Weather	15°C (59°F)	92 mm (3.6 inches)	82%	moderate
September Weather	10°C (50°F)	72 mm (2.8 inches)	89%	moderate
October Weather	5°C (40°F)	86 mm (3.4 inches)	93%	low
November Weather	0°C (33°F)	59 mm (2.3 inches)	93%	low
December Weather	-3°C (26°F)	48 mm (1.9 inches)	95%	low