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September Weather in Hallstavik, Sweden

Last updated: August 27, 2025

In September, the average temperature in Hallstavik, Sweden hovers around 12°C (55°F), with a minimum of -1°C (31°F) and a high reaching 25°C (77°F). Rainfall adds to the ambiance with an average precipitation of 48 mm (1.9 in) spread across 10 days, while the average humidity peaks at a cozy 85%.

September Temperature in Hallstavik

In September in Hallstavik, the average temperature is 12°C (55°F), with maximums reaching up to 25°C (77°F) and minimums dropping as low as -1°C (31°F). This variation in temperature makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates September temperature patterns in Hallstavik, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hallstavik, September typically has an average temperature of 12°C (55°F), with highs reaching up to 25°C (77°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec313034405061636254463933
Data source: Temperature data for Hallstavik 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 Hallstavik

In Hallstavik in September, the precipitation amount is 48 mm (1.9 in) spread over a period of 10 days.

September Precipitation Trends in Hallstavik

The chart displays monthly precipitation patterns in Hallstavik, 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 Hallstavik, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec363338305648666848704056
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hallstavik

In Hallstavik in September humidity is 85%. With an average temperature of 12°C (55°F), this humidity feels like a thick, damp blanket wrapping around you, making every step feel heavier and less invigorating for traveling.

September Average Humidity in Hallstavik

This chart illustrates the average monthly humidity levels in Hallstavik, 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 Hallstavik is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%89%85%77%76%74%77%85%89%90%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hallstavik

In Hallstavik 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 Hallstavik for better planning.

Maximum UV Index Levels in Hallstavik for September

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

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

This table compares monthly weather conditions in Hallstavik, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)36 mm (1.4 inches)90%low
February Weather-1°C (30°F)33 mm (1.3 inches)88%low
March Weather1°C (34°F)38 mm (1.5 inches)89%moderate
April Weather5°C (41°F)30 mm (1.2 inches)85%moderate
May Weather10°C (50°F)56 mm (2.2 inches)77%moderate
June Weather16°C (61°F)48 mm (1.9 inches)76%high
July Weather17°C (64°F)66 mm (2.6 inches)74%high
August Weather17°C (62°F)68 mm (2.7 inches)77%moderate
September Weather12°C (55°F)48 mm (1.9 inches)85%moderate
October Weather8°C (46°F)70 mm (2.7 inches)89%low
November Weather4°C (39°F)40 mm (1.6 inches)90%low
December Weather0°C (33°F)56 mm (2.2 inches)87%low

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