September Weather in Alastaro, Finland

Last updated: August 23, 2025

In September, the average temperature in Alastaro, Finland hovers around 11°C (53°F), with a minimum dipping to -2°C (29°F) and a maximum reaching 24°C (76°F). Expect a total precipitation of 59 mm (2.3 in) falling over approximately 12 days, and don't forget to bring a light jacket as the average humidity sits at a high 90%.

September Temperature in Alastaro

In September in Alastaro, the average temperature is 11°C (53°F). Maximum temperatures can reach 24°C (76°F), while the minimum can drop as low as -2°C (29°F). Travelers should be prepared for a wide temperature range and pack accordingly.

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

The chart illustrates September temperature patterns in Alastaro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alastaro, September typically has an average temperature of 11°C (53°F), with highs reaching up to 24°C (76°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Alastaro

In Alastaro in September, the precipitation amount is 59 mm (2.3 in) occurring over the course of 12 days.

September Precipitation Trends in Alastaro

The chart displays monthly precipitation patterns in Alastaro, 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 Alastaro, September typically receives around 59 mm (2.3 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 Alastaro

In Alastaro in September, humidity is 90%. With an average temperature of 11°C (53°F), this humidity feels like a heavy cloak, making traveling feel sticky and exhausting, as the dampness clings to your skin and the chill in the air sharpens the discomfort, leaving you longing for a breath of fresh, dry air.

September Average Humidity in Alastaro

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

In Alastaro 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 Alastaro, you can check the information here.

Maximum UV Index Levels in Alastaro for September

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

Data source: Alastaro 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 Alastaro Compares to Other Months

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

This table compares monthly weather conditions in Alastaro, 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)	46 mm (1.8 inches)	97%	low
February Weather	-4°C (25°F)	42 mm (1.6 inches)	95%	low
March Weather	-1°C (31°F)	43 mm (1.7 inches)	93%	moderate
April Weather	4°C (39°F)	38 mm (1.5 inches)	86%	moderate
May Weather	10°C (50°F)	50 mm (2.0 inches)	75%	moderate
June Weather	16°C (61°F)	57 mm (2.2 inches)	75%	high
July Weather	17°C (64°F)	83 mm (3.3 inches)	80%	high
August Weather	16°C (61°F)	83 mm (3.3 inches)	83%	moderate
September Weather	11°C (53°F)	59 mm (2.3 inches)	90%	moderate
October Weather	6°C (44°F)	75 mm (3.0 inches)	93%	low
November Weather	3°C (37°F)	54 mm (2.1 inches)	94%	low
December Weather	-1°C (30°F)	64 mm (2.5 inches)	95%	low