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September Weather in Ruukki, Finland

Last updated: August 23, 2025

In September, the average temperature in Ruukki, Finland is a mild 10°C (50°F). However, be prepared for some fluctuations, as temperatures can dip as low as -5°C (23°F) or rise to a pleasant 24°C (75°F). Visitors will experience an average precipitation of 70 mm (2.8 in) over approximately 12 days, along with a cozy humidity level of 89%.

September Temperature in Ruukki

In September in Ruukki, the average temperature is 10°C (50°F), with maximums reaching 24°C (75°F) and minimums dropping to as low as -5°C (23°F). This variation in temperature makes it essential to pack accordingly for your travel plans.

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

The chart illustrates September temperature patterns in Ruukki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ruukki, 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 (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec201825344557625849403225
Data source: Temperature data for Ruukki generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Ruukki

In Ruukki in September, the precipitation amount is 70 mm (2.8 in) over the course of 12 days.

September Precipitation Trends in Ruukki

The chart displays monthly precipitation patterns in Ruukki, 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 Ruukki, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec363636365353749270775750
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ruukki

In Ruukki 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 Ruukki

This chart illustrates the average monthly humidity levels in Ruukki, 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 Ruukki is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec99%97%93%86%80%76%79%83%89%94%94%98%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ruukki

In Ruukki 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 Ruukki, you can check the information here.

Maximum UV Index Levels in Ruukki for September

The chart shows the monthly maximum UV Index (UVI) for Ruukki 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 Ruukki typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113446643211
Data source: Ruukki 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 Ruukki Compares to Other Months

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

This table compares monthly weather conditions in Ruukki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)36 mm (1.4 inches)99%low
February Weather-8°C (18°F)36 mm (1.4 inches)97%low
March Weather-4°C (26°F)36 mm (1.4 inches)93%moderate
April Weather1°C (34°F)36 mm (1.4 inches)86%moderate
May Weather7°C (46°F)52 mm (2.1 inches)80%moderate
June Weather14°C (58°F)53 mm (2.1 inches)76%high
July Weather17°C (62°F)74 mm (2.9 inches)79%high
August Weather14°C (58°F)92 mm (3.6 inches)83%moderate
September Weather10°C (50°F)70 mm (2.8 inches)89%moderate
October Weather4°C (40°F)77 mm (3.0 inches)94%low
November Weather0°C (32°F)57 mm (2.2 inches)94%low
December Weather-4°C (25°F)50 mm (2.0 inches)98%low

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