September Weather in Somero, Finland

Last updated: August 23, 2025

In Somero, Finland, the average temperature in September hovers around 11°C (53°F). Temperatures can vary significantly, dropping as low as -4°C (26°F) and soaring to a maximum of 24°C (75°F). Expect 59 mm (2.3 in) of precipitation distributed over 12 days, contributing to an average humidity of 90%. Prepare for a mix of cool breezes and occasional showers!

September Temperature in Somero

In September in Somero, the average temperature is 11°C (53°F), with maximums reaching 24°C (75°F) and minimums dipping as low as -4°C (26°F). This makes it essential for travelers to pack layers to stay comfortable in varying conditions.

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

The chart illustrates September temperature patterns in Somero, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somero, September typically has an average temperature of 11°C (53°F), with highs reaching up to 24°C (75°F) and lows dropping to around -4°C (26°F).

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

September Precipitation in Somero

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

September Precipitation Trends in Somero

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

In Somero 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 Somero

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

In Somero 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 Somero for better planning.

Maximum UV Index Levels in Somero for September

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

Data source: Somero 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 Somero Compares to Other Months

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

This table compares monthly weather conditions in Somero, 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)	51 mm (2.0 inches)	97%	low
February Weather	-4°C (25°F)	45 mm (1.8 inches)	95%	low
March Weather	-1°C (30°F)	49 mm (1.9 inches)	93%	moderate
April Weather	4°C (39°F)	39 mm (1.5 inches)	86%	moderate
May Weather	10°C (50°F)	59 mm (2.3 inches)	75%	moderate
June Weather	16°C (62°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)	84 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)	79 mm (3.1 inches)	93%	low
November Weather	3°C (37°F)	54 mm (2.1 inches)	94%	low
December Weather	-1°C (30°F)	68 mm (2.7 inches)	95%	low