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September Weather in Roknaes, Sweden

Last updated: August 27, 2025

In September, the average temperature in Roknaes, Sweden hovers around 9°C (49°F), with a minimum dipping down to -4°C (25°F) and a maximum reaching up to 22°C (72°F). You can expect about 67 mm (2.7 in) of precipitation spread over 10 days, while the air remains quite humid, with an average humidity of 88%.

September Temperature in Roknaes

In September in Roknaes, the average temperature is 9°C (49°F). Maximum temperatures can reach up to 22°C (72°F), while minimums can drop as low as -4°C (25°F). Be sure to pack layers for your trip, as the weather can vary significantly throughout the day.

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

The chart illustrates September temperature patterns in Roknaes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roknaes, September typically has an average temperature of 9°C (49°F), with highs reaching up to 22°C (72°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec191827354658625849382823
Data source: Temperature data for Roknaes 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 Roknaes

In Roknaes in September, the precipitation amount is 67 mm (2.7 in) over a span of 10 days.

September Precipitation Trends in Roknaes

The chart displays monthly precipitation patterns in Roknaes, 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 Roknaes, September typically receives around 67 mm (2.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec564143304954808767895272
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roknaes

In Roknaes 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 Roknaes

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

In Roknaes 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 Roknaes, you can check the information here.

Maximum UV Index Levels in Roknaes for September

The chart shows the monthly maximum UV Index (UVI) for Roknaes 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 Roknaes typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112446643211
Data source: Roknaes 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 Roknaes Compares to Other Months

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

This table compares monthly weather conditions in Roknaes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)56 mm (2.2 inches)97%low
February Weather-8°C (18°F)41 mm (1.6 inches)95%low
March Weather-3°C (27°F)43 mm (1.7 inches)90%low
April Weather2°C (35°F)30 mm (1.2 inches)84%moderate
May Weather8°C (46°F)49 mm (1.9 inches)81%moderate
June Weather14°C (58°F)54 mm (2.1 inches)78%high
July Weather17°C (62°F)80 mm (3.1 inches)82%high
August Weather14°C (58°F)87 mm (3.4 inches)84%moderate
September Weather9°C (49°F)67 mm (2.7 inches)88%moderate
October Weather3°C (38°F)89 mm (3.5 inches)92%low
November Weather-2°C (29°F)52 mm (2.0 inches)93%low
December Weather-5°C (23°F)72 mm (2.8 inches)96%low

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