September Weather in Mellilae, Finland

Last updated: August 23, 2025

In September, the average temperature in Mellilae, Finland hovers around 11°C (52°F). However, be prepared for temperature fluctuations, as it can dip to a chilly -3°C (26°F) or soar to a pleasant 24°C (75°F). Expect 61 mm (2.4 in) of precipitation spread over 12 days, and don't forget the high 90% humidity, which adds to the unique charm of this season!

September Temperature in Mellilae

In September in Mellilae, the average temperature is 11°C (52°F). The maximum can reach 24°C (75°F), while the minimum can drop as low as -3°C (26°F). This variability makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates September temperature patterns in Mellilae, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mellilae, September typically has an average temperature of 11°C (52°F), with highs reaching up to 24°C (75°F) and lows dropping to around -3°C (26°F).

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

September Precipitation in Mellilae

In Mellilae in September, the total precipitation amount is 61 mm (2.4 in), which occurs over a span of 12 days.

September Precipitation Trends in Mellilae

The chart displays monthly precipitation patterns in Mellilae, 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 Mellilae, September typically receives around 61 mm (2.4 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 Mellilae

In Mellilae 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 Mellilae

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

In Mellilae 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 Mellilae for better planning.

Maximum UV Index Levels in Mellilae for September

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

Data source: Mellilae 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 Mellilae Compares to Other Months

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

This table compares monthly weather conditions in Mellilae, 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)	48 mm (1.9 inches)	97%	low
February Weather	-4°C (25°F)	43 mm (1.7 inches)	95%	low
March Weather	-1°C (31°F)	45 mm (1.8 inches)	93%	moderate
April Weather	4°C (39°F)	39 mm (1.5 inches)	86%	moderate
May Weather	10°C (50°F)	55 mm (2.2 inches)	75%	moderate
June Weather	16°C (61°F)	56 mm (2.2 inches)	75%	high
July Weather	18°C (64°F)	81 mm (3.2 inches)	80%	high
August Weather	16°C (61°F)	88 mm (3.4 inches)	83%	moderate
September Weather	11°C (52°F)	61 mm (2.4 inches)	90%	moderate
October Weather	6°C (43°F)	76 mm (3.0 inches)	93%	low
November Weather	3°C (37°F)	52 mm (2.1 inches)	94%	low
December Weather	-1°C (30°F)	67 mm (2.6 inches)	95%	low