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September Weather in Nagu, Finland

Last updated: August 23, 2025

In September, the average temperature in Nagu, Finland hovers around 13°C (56°F). Expect a minimum dip to 4°C (40°F) and a pleasant peak of 21°C (70°F). This month sees 78 mm (3.1 in) of precipitation spread over 13 days, resulting in an average humidity of 86%. Be prepared for a mix of cool and damp weather!

September Temperature in Nagu

In September in Nagu, the average temperature is 13°C (56°F). Maximum temperatures can reach 21°C (70°F), while minimums can drop as low as 4°C (40°F). It's a great time to visit if you enjoy mild weather and want to experience the charm of Nagu during this pleasant season.

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

The chart illustrates September temperature patterns in Nagu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nagu, September typically has an average temperature of 13°C (56°F), with highs reaching up to 21°C (70°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec312832384859646356484134
Data source: Temperature data for Nagu 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 Nagu

In Nagu in September, the precipitation amount is 78 mm (3.1 in) spread over 13 days.

September Precipitation Trends in Nagu

The chart displays monthly precipitation patterns in Nagu, 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 Nagu, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec5143452939376085781047488
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nagu

In Nagu in September, humidity is 86%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making outdoor activities slightly uncomfortable and prompting travelers to seek shade or air-conditioned spaces frequently.

September Average Humidity in Nagu

This chart illustrates the average monthly humidity levels in Nagu, 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 Nagu is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%89%85%77%78%78%79%86%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nagu

In Nagu 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 Nagu for better planning.

Maximum UV Index Levels in Nagu for September

The chart shows the monthly maximum UV Index (UVI) for Nagu 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 Nagu typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Nagu 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 Nagu Compares to Other Months

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

This table compares monthly weather conditions in Nagu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)51 mm (2.0 inches)92%low
February Weather-2°C (28°F)43 mm (1.7 inches)90%low
March Weather0°C (32°F)45 mm (1.8 inches)89%moderate
April Weather3°C (39°F)29 mm (1.1 inches)85%moderate
May Weather9°C (48°F)39 mm (1.5 inches)77%moderate
June Weather15°C (59°F)37 mm (1.4 inches)78%high
July Weather18°C (64°F)60 mm (2.4 inches)78%high
August Weather17°C (63°F)85 mm (3.3 inches)79%moderate
September Weather13°C (56°F)78 mm (3.1 inches)86%moderate
October Weather9°C (48°F)104 mm (4.1 inches)90%low
November Weather5°C (42°F)74 mm (2.9 inches)91%low
December Weather1°C (35°F)88 mm (3.5 inches)89%low

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