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September Weather in Nastola, Finland

Last updated: August 23, 2025

In September, the average temperature in Nastola, Finland hovers around 11°C (52°F). Expect chilly days, with minimum temperatures dipping to -1°C (31°F) and a pleasant maximum of 23°C (73°F). Be prepared for some rain, as precipitation totals about 61 mm (2.4 in) over 11 days, and the air will feel quite humid, with an average humidity of 90%.

September Temperature in Nastola

In September in Nastola, the average temperature is 11°C (52°F). The maximum can reach 23°C (73°F), while the minimum can drop as low as -1°C (31°F). This variation makes it essential to pack layers and be prepared for both warm and cool weather when traveling.

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

The chart illustrates September temperature patterns in Nastola, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nastola, September typically has an average temperature of 11°C (52°F), with highs reaching up to 23°C (73°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec252329385061636152433628
Data source: Temperature data for Nastola 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 Nastola

In Nastola in September, the total precipitation amount is 61 mm (2.4 in) over the course of 11 days.

September Precipitation Trends in Nastola

The chart displays monthly precipitation patterns in Nastola, 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 Nastola, September typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec494645475462778561775472
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nastola

In Nastola in September, humidity is 90%. With an average temperature of 11°C (52°F), this humidity feels like a heavy blanket that clings to your skin, making travel uncomfortable and muggy.

September Average Humidity in Nastola

This chart illustrates the average monthly humidity levels in Nastola, 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 Nastola is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec98%96%93%87%75%74%80%85%90%94%94%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nastola

In Nastola 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 Nastola, you can check the information here.

Maximum UV Index Levels in Nastola for September

The chart shows the monthly maximum UV Index (UVI) for Nastola 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 Nastola typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456753211
Data source: Nastola 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 Nastola Compares to Other Months

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

This table compares monthly weather conditions in Nastola, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)49 mm (1.9 inches)98%low
February Weather-5°C (24°F)46 mm (1.8 inches)96%low
March Weather-2°C (29°F)44 mm (1.8 inches)93%moderate
April Weather3°C (38°F)47 mm (1.9 inches)87%moderate
May Weather10°C (50°F)54 mm (2.1 inches)75%moderate
June Weather16°C (61°F)62 mm (2.4 inches)74%high
July Weather17°C (64°F)77 mm (3.0 inches)80%high
August Weather16°C (61°F)84 mm (3.3 inches)85%moderate
September Weather11°C (52°F)61 mm (2.4 inches)90%moderate
October Weather6°C (43°F)77 mm (3.0 inches)94%low
November Weather2°C (36°F)54 mm (2.1 inches)94%low
December Weather-2°C (28°F)72 mm (2.8 inches)96%low

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