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September Weather in Nykarleby, Finland

Last updated: August 23, 2025

In September, the average temperature in Nykarleby, Finland hovers around 11°C (51°F), providing a mild climate for visitors. Expect a minimum temperature of -1°C (31°F), while the days can warm up to a pleasant 24°C (75°F). With an average precipitation of 71 mm (2.8 in) spread over 12 days, you might want to pack an umbrella. Additionally, be prepared for high humidity at 88%, making for a refreshing and somewhat cozy atmosphere.

September Temperature in Nykarleby

In September in Nykarleby, the average temperature is 11°C (51°F). The maximum can reach 24°C (75°F), while the minimum can be as low as -1°C (31°F). Overall, this month offers a comfortable climate for travelers who enjoy mild weather and are prepared for temperature fluctuations.

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

The chart illustrates September temperature patterns in Nykarleby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nykarleby, September typically has an average temperature of 11°C (51°F), with highs reaching up to 24°C (75°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec252228364658635951423528
Data source: Temperature data for Nykarleby 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 Nykarleby

In Nykarleby in September, the precipitation amount is 71 mm (2.8 in) during a total of 12 days.

September Precipitation Trends in Nykarleby

The chart displays monthly precipitation patterns in Nykarleby, 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 Nykarleby, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec364040404851638271835747
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nykarleby

In Nykarleby in September humidity is 88%. With an average temperature of 11°C (51°F), this humidity feels like traveling through a damp, heavy blanket, making every step slightly more laborious and the air thick with moisture, which can be quite uncomfortable for exploration.

September Average Humidity in Nykarleby

This chart illustrates the average monthly humidity levels in Nykarleby, 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 Nykarleby is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%93%91%85%77%75%80%82%88%92%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nykarleby

In Nykarleby 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 Nykarleby, you can check the information here.

Maximum UV Index Levels in Nykarleby for September

The chart shows the monthly maximum UV Index (UVI) for Nykarleby 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 Nykarleby typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: Nykarleby 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 Nykarleby Compares to Other Months

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

This table compares monthly weather conditions in Nykarleby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)36 mm (1.4 inches)95%low
February Weather-5°C (23°F)40 mm (1.6 inches)93%low
March Weather-2°C (29°F)40 mm (1.6 inches)91%moderate
April Weather2°C (37°F)40 mm (1.6 inches)85%moderate
May Weather8°C (47°F)48 mm (1.9 inches)77%moderate
June Weather15°C (59°F)51 mm (2.0 inches)74%high
July Weather17°C (63°F)63 mm (2.5 inches)80%high
August Weather15°C (60°F)82 mm (3.2 inches)82%moderate
September Weather11°C (51°F)71 mm (2.8 inches)88%moderate
October Weather6°C (42°F)83 mm (3.2 inches)92%low
November Weather1°C (35°F)57 mm (2.2 inches)92%low
December Weather-2°C (29°F)47 mm (1.9 inches)93%low

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