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September Weather in Hailuoto, Finland

Last updated: August 23, 2025

In Hailuoto, Finland, the average temperature in September is a mild 11°C (52°F), with daily variations ranging from a cozy 4°C (39°F) to a pleasant 20°C (67°F). During this month, expect about 84 mm (3.3 in) of precipitation over 14 days, contributing to an average humidity of 89%. Be prepared for a mix of cool and damp weather!

September Temperature in Hailuoto

In September in Hailuoto, the average temperature is 11°C (52°F). The maximum can reach 20°C (67°F), while the minimum can be as low as 4°C (39°F). This makes it a pleasant time for travelers to enjoy outdoor activities, but it's advisable to bring layers for cooler evenings.

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

The chart illustrates September temperature patterns in Hailuoto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hailuoto, September typically has an average temperature of 11°C (52°F), with highs reaching up to 20°C (67°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec221924304155625952423427
Data source: Temperature data for Hailuoto 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 Hailuoto

In Hailuoto in September, the precipitation amount is 84 mm (3.3 in) over the course of 14 days.

September Precipitation Trends in Hailuoto

The chart displays monthly precipitation patterns in Hailuoto, 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 Hailuoto, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec4039383752516387841007058
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hailuoto

In Hailuoto in September humidity is 89%. With an average temperature of 11°C (52°F), this humidity feels like a cool mist clinging to your skin, making outdoor activities feel damp and chilly, so it's essential to dress in layers and be prepared for a brisk experience while traveling.

September Average Humidity in Hailuoto

This chart illustrates the average monthly humidity levels in Hailuoto, 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 Hailuoto 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 Hailuoto

In Hailuoto 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 Hailuoto, you can check the information here.

Maximum UV Index Levels in Hailuoto for September

The chart shows the monthly maximum UV Index (UVI) for Hailuoto 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 Hailuoto typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456643211
Data source: Hailuoto 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 Hailuoto Compares to Other Months

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

This table compares monthly weather conditions in Hailuoto, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)40 mm (1.6 inches)99%low
February Weather-7°C (19°F)39 mm (1.5 inches)97%low
March Weather-4°C (24°F)38 mm (1.5 inches)93%moderate
April Weather-1°C (30°F)37 mm (1.4 inches)86%moderate
May Weather5°C (41°F)52 mm (2.1 inches)80%moderate
June Weather13°C (55°F)51 mm (2.0 inches)76%high
July Weather17°C (62°F)63 mm (2.5 inches)79%high
August Weather15°C (60°F)87 mm (3.4 inches)83%moderate
September Weather11°C (52°F)84 mm (3.3 inches)89%moderate
October Weather6°C (42°F)100 mm (4.0 inches)94%low
November Weather1°C (35°F)70 mm (2.8 inches)94%low
December Weather-3°C (28°F)58 mm (2.3 inches)98%low

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