September Weather in Siikajoki, Finland

Last updated: August 23, 2025

In Siikajoki, Finland, the average temperature for September hovers around 10°C (51°F), with a minimum dipping to -2°C (29°F) and a maximum reaching 22°C (72°F). Expect about 76 mm (3.0 in) of precipitation spread over 13 days, contributing to an average humidity level of a humid 89%.

September Temperature in Siikajoki

In September in Siikajoki, the average temperature is 10°C (51°F). The maximum can reach 22°C (72°F) and the minimum can be as low as -2°C (29°F). This makes Siikajoki a great destination for travelers seeking a mix of mild and chilly weather during this time.

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

The chart illustrates September temperature patterns in Siikajoki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siikajoki, September typically has an average temperature of 10°C (51°F), with highs reaching up to 22°C (72°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Siikajoki

In Siikajoki in September, the total precipitation amount is 76 mm (3.0 in), which occurs over the course of 13 days.

September Precipitation Trends in Siikajoki

The chart displays monthly precipitation patterns in Siikajoki, 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 Siikajoki, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 13 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 Siikajoki

In Siikajoki in September humidity is 89%. With an average temperature of 10°C (51°F), this humidity feels like traveling through a thick fog, where the damp air clings to your skin, making the coolness feel even chillier and adding an element of discomfort to your adventures.

September Average Humidity in Siikajoki

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

In Siikajoki 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 Siikajoki, you can check the information here.

Maximum UV Index Levels in Siikajoki for September

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

Data source: Siikajoki 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 Siikajoki Compares to Other Months

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

This table compares monthly weather conditions in Siikajoki, 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)	37 mm (1.4 inches)	97%	low
March Weather	-4°C (25°F)	37 mm (1.4 inches)	93%	moderate
April Weather	0°C (33°F)	37 mm (1.5 inches)	86%	moderate
May Weather	7°C (44°F)	54 mm (2.1 inches)	80%	moderate
June Weather	13°C (57°F)	51 mm (2.0 inches)	76%	high
July Weather	17°C (62°F)	68 mm (2.7 inches)	79%	high
August Weather	15°C (59°F)	91 mm (3.6 inches)	83%	moderate
September Weather	10°C (51°F)	76 mm (3.0 inches)	89%	moderate
October Weather	5°C (41°F)	87 mm (3.4 inches)	94%	low
November Weather	1°C (33°F)	62 mm (2.4 inches)	94%	low
December Weather	-3°C (27°F)	52 mm (2.1 inches)	98%	low