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September Weather in Ostvik, Sweden

Last updated: August 27, 2025

In September, the average temperature in Ostvik, Sweden hovers around 9°C (49°F), with a minimum dip to -3°C (27°F) and a pleasant peak at 21°C (70°F). Expect 71 mm (2.8 in) of precipitation over approximately 10 days, contributing to an average humidity level of 88%. Prepare for a mix of cool and wet days this month!

September Temperature in Ostvik

In September in Ostvik, the average temperature is 9°C (49°F), with maximums reaching up to 21°C (70°F) and minimums dropping as low as -3°C (27°F). To ensure a comfortable visit, travelers should prepare for a mix of mild and chilly conditions.

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

The chart illustrates September temperature patterns in Ostvik, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ostvik, September typically has an average temperature of 9°C (49°F), with highs reaching up to 21°C (70°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec191826344557615849382924
Data source: Temperature data for Ostvik 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 Ostvik

In Ostvik in September, the precipitation amount is 71 mm (2.8 in) over a duration of 10 days.

September Precipitation Trends in Ostvik

The chart displays monthly precipitation patterns in Ostvik, 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 Ostvik, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec564241305057778871965773
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ostvik

In Ostvik in September, humidity is 88%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

September Average Humidity in Ostvik

This chart illustrates the average monthly humidity levels in Ostvik, 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 Ostvik is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%90%84%82%78%82%84%88%92%93%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ostvik

In Ostvik 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 Ostvik, you can check the information here.

Maximum UV Index Levels in Ostvik for September

The chart shows the monthly maximum UV Index (UVI) for Ostvik 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 Ostvik typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112346643211
Data source: Ostvik 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 Ostvik Compares to Other Months

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

This table compares monthly weather conditions in Ostvik, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)55 mm (2.2 inches)97%low
February Weather-8°C (19°F)42 mm (1.6 inches)95%low
March Weather-3°C (26°F)41 mm (1.6 inches)90%low
April Weather1°C (35°F)30 mm (1.2 inches)84%moderate
May Weather7°C (45°F)50 mm (2.0 inches)81%moderate
June Weather14°C (57°F)57 mm (2.3 inches)78%high
July Weather16°C (61°F)77 mm (3.0 inches)82%high
August Weather14°C (58°F)88 mm (3.5 inches)84%moderate
September Weather9°C (49°F)71 mm (2.8 inches)88%moderate
October Weather4°C (39°F)96 mm (3.8 inches)92%low
November Weather-2°C (29°F)57 mm (2.2 inches)93%low
December Weather-4°C (24°F)73 mm (2.9 inches)96%low

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