September Weather in Merijaervi, Finland

Last updated: August 23, 2025

In September, the average temperature in Merijaervi, Finland hovers around 10°C (50°F). Visitors can expect a chilly minimum of -5°C (24°F), while warm days can reach up to 24°C (75°F). With an average precipitation of 77 mm (3.0 in) spread over 12 days, and a humidity level of 89%, be prepared for a damp and crisp atmosphere.

September Temperature in Merijaervi

In September in Merijaervi, the average temperature is 10°C (50°F), with maximums reaching 24°C (75°F) and minimums dropping as low as -5°C (24°F). This variation in temperature makes it essential for travelers to pack layers to stay comfortable throughout the day.

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

The chart illustrates September temperature patterns in Merijaervi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merijaervi, September typically has an average temperature of 10°C (50°F), with highs reaching up to 24°C (75°F) and lows dropping to around -5°C (24°F).

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

September Precipitation in Merijaervi

In Merijaervi in September, the precipitation amount is 77 mm (3.0 in) spread over 12 days.

September Precipitation Trends in Merijaervi

The chart displays monthly precipitation patterns in Merijaervi, 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 Merijaervi, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 12 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 Merijaervi

In Merijaervi 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 Merijaervi

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

In Merijaervi 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 Merijaervi, you can check the information here.

Maximum UV Index Levels in Merijaervi for September

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

Data source: Merijaervi 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 Merijaervi Compares to Other Months

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

This table compares monthly weather conditions in Merijaervi, 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)	37 mm (1.4 inches)	99%	low
February Weather	-7°C (19°F)	39 mm (1.5 inches)	97%	low
March Weather	-3°C (27°F)	38 mm (1.5 inches)	93%	moderate
April Weather	2°C (36°F)	40 mm (1.6 inches)	86%	moderate
May Weather	8°C (47°F)	57 mm (2.2 inches)	80%	moderate
June Weather	15°C (59°F)	60 mm (2.3 inches)	76%	high
July Weather	17°C (63°F)	75 mm (3.0 inches)	79%	high
August Weather	15°C (58°F)	96 mm (3.8 inches)	83%	moderate
September Weather	10°C (50°F)	77 mm (3.0 inches)	89%	moderate
October Weather	4°C (40°F)	82 mm (3.2 inches)	94%	low
November Weather	0°C (32°F)	60 mm (2.4 inches)	94%	low
December Weather	-4°C (25°F)	49 mm (1.9 inches)	98%	low