September Weather in Lapinjaervi, Finland

Last updated: August 23, 2025

In Lapinjaervi, Finland, the average temperature in September hovers around 12°C (54°F), with a minimum of 0°C (32°F) and a maximum reaching 22°C (72°F). During this time, expect 63 mm (2.5 in) of precipitation spread over 13 days, making it a notably wet month. The atmosphere can feel quite humid, with an average humidity level of 90%, so be prepared for some occasionally soggy weather!

September Temperature in Lapinjaervi

In September in Lapinjaervi, the average temperature is 12°C (54°F). Maximums can reach 22°C (72°F), and minimums can be as low as 0°C (32°F). This pleasant climate makes Lapinjaervi an ideal destination for travelers seeking a diverse range of outdoor activities and experiences.

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

The chart illustrates September temperature patterns in Lapinjaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lapinjaervi, September typically has an average temperature of 12°C (54°F), with highs reaching up to 22°C (72°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Lapinjaervi

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

September Precipitation Trends in Lapinjaervi

The chart displays monthly precipitation patterns in Lapinjaervi, 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 Lapinjaervi, 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 Lapinjaervi

In Lapinjaervi 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 Lapinjaervi

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

In Lapinjaervi 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 Lapinjaervi for better planning.

Maximum UV Index Levels in Lapinjaervi for September

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

Data source: Lapinjaervi 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 Lapinjaervi Compares to Other Months

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

This table compares monthly weather conditions in Lapinjaervi, 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 (27°F)	56 mm (2.2 inches)	98%	low
February Weather	-4°C (25°F)	52 mm (2.0 inches)	96%	low
March Weather	-1°C (30°F)	49 mm (1.9 inches)	93%	moderate
April Weather	4°C (39°F)	45 mm (1.8 inches)	87%	moderate
May Weather	10°C (50°F)	48 mm (1.9 inches)	75%	moderate
June Weather	16°C (61°F)	50 mm (2.0 inches)	74%	high
July Weather	18°C (65°F)	67 mm (2.7 inches)	80%	high
August Weather	17°C (62°F)	79 mm (3.1 inches)	85%	moderate
September Weather	12°C (54°F)	63 mm (2.5 inches)	90%	moderate
October Weather	7°C (45°F)	89 mm (3.5 inches)	94%	low
November Weather	3°C (38°F)	66 mm (2.6 inches)	94%	low
December Weather	-1°C (30°F)	79 mm (3.1 inches)	96%	low