September Weather in Heinaevesi, Finland

Last updated: August 23, 2025

In September, the average temperature in Heinaevesi, Finland is a cool 10°C (50°F). During this time, temperatures can drop to a chilly 0°C (32°F) or rise to a comfortable 22°C (73°F). Expect 85 mm (3.4 in) of precipitation spread across approximately 14 days, contributing to an average humidity of 92%. Make sure to prepare for a damp and brisk month ahead!

September Temperature in Heinaevesi

In September in Heinaevesi, the average temperature is 10°C (50°F), with maximums reaching up to 22°C (73°F) and minimums dropping as low as 0°C (32°F). Be sure to pack layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates September temperature patterns in Heinaevesi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heinaevesi, September typically has an average temperature of 10°C (50°F), with highs reaching up to 22°C (73°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Heinaevesi

In Heinaevesi in September, the precipitation amount is 85 mm (3.4 in) spread over 14 days, contributing to the region's overall climate patterns.

September Precipitation Trends in Heinaevesi

The chart displays monthly precipitation patterns in Heinaevesi, 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 Heinaevesi, September typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 14 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 Heinaevesi

In Heinaevesi in September humidity is 92%. With an average temperature of 10°C (50°F), this humidity feels like a chilly, damp cloak wrapping around you, making every step outside feel heavy and each breath a bit more labored, turning exploring into an uncomfortable challenge.

September Average Humidity in Heinaevesi

This chart illustrates the average monthly humidity levels in Heinaevesi, 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 Heinaevesi is approximately 92%, 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 Heinaevesi

In Heinaevesi 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 Heinaevesi, you can check the information here.

Maximum UV Index Levels in Heinaevesi for September

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

Data source: Heinaevesi 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 Heinaevesi Compares to Other Months

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

This table compares monthly weather conditions in Heinaevesi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	49 mm (1.9 inches)	99%	low
February Weather	-7°C (20°F)	44 mm (1.7 inches)	98%	low
March Weather	-3°C (27°F)	47 mm (1.8 inches)	95%	moderate
April Weather	2°C (35°F)	43 mm (1.7 inches)	87%	moderate
May Weather	9°C (48°F)	61 mm (2.4 inches)	78%	moderate
June Weather	16°C (61°F)	67 mm (2.6 inches)	75%	high
July Weather	17°C (63°F)	81 mm (3.2 inches)	83%	high
August Weather	15°C (60°F)	87 mm (3.4 inches)	88%	moderate
September Weather	10°C (50°F)	85 mm (3.4 inches)	92%	moderate
October Weather	5°C (41°F)	79 mm (3.1 inches)	95%	low
November Weather	1°C (33°F)	64 mm (2.5 inches)	94%	low
December Weather	-4°C (25°F)	70 mm (2.7 inches)	98%	low