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September Weather in Sund, Åland Islands

Last updated: August 22, 2025

In September, the average temperature in Sund, Åland Islands hovers around 13°C (56°F), with lows reaching 5°C (42°F) and highs peaking at 21°C (70°F). Expect 57 mm (2.3 in) of precipitation spread over about 11 days, contributing to a notably high average humidity of 86%. Prepare for a mix of cool temps and damp conditions!

September Temperature in Sund

In September in Sund, the average temperature is 13°C (56°F). Maximum temperatures can reach 21°C (70°F), while minimums can drop to as low as 5°C (42°F). This mild climate makes Sund an attractive destination for travelers looking to enjoy comfortable weather.

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

The chart illustrates September temperature patterns in Sund, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sund, 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 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec333234394758636356484236
Data source: Temperature data for Sund 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 Sund

In Sund in September, the total precipitation amount is 57 mm (2.3 in) over the course of 11 days.

September Precipitation Trends in Sund

The chart displays monthly precipitation patterns in Sund, 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 Sund, September typically receives around 57 mm (2.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec443436253830475657875071
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sund

In Sund 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 Sund

This chart illustrates the average monthly humidity levels in Sund, 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 Sund is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%90%85%77%76%75%78%86%91%91%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sund

In Sund 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 Sund for better planning.

Maximum UV Index Levels in Sund for September

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

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

This table compares monthly weather conditions in Sund, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)44 mm (1.7 inches)92%low
February Weather0°C (32°F)34 mm (1.3 inches)90%low
March Weather1°C (34°F)36 mm (1.4 inches)90%moderate
April Weather4°C (39°F)25 mm (1.0 inches)85%moderate
May Weather8°C (47°F)38 mm (1.5 inches)77%moderate
June Weather15°C (58°F)30 mm (1.2 inches)76%high
July Weather17°C (63°F)47 mm (1.9 inches)75%high
August Weather17°C (63°F)56 mm (2.2 inches)78%moderate
September Weather13°C (56°F)57 mm (2.3 inches)86%moderate
October Weather9°C (48°F)87 mm (3.4 inches)90%low
November Weather6°C (42°F)50 mm (2.0 inches)91%low
December Weather2°C (36°F)71 mm (2.8 inches)90%low

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