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September Weather in Graenna, Sweden

Last updated: August 27, 2025

In September, the average temperature in Graenna, Sweden hovers around 12°C (55°F). Expect a refreshing range, with minimums dipping to 3°C (37°F) and maximums peaking at 23°C (73°F). Be prepared for 80 mm (3.1 in) of precipitation over about 12 days, contributing to an average humidity of 82%. Whether you're planning outdoor adventures or cozy indoor activities, this month offers a blend of cool days and occasional rain!

September Temperature in Graenna

In September in Graenna, the average temperature is 12°C (55°F). Maximum temperatures can reach up to 23°C (73°F), while minimums can drop to as low as 3°C (37°F). This climate makes it an ideal time for travelers to experience mild weather and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Graenna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Graenna, September typically has an average temperature of 12°C (55°F), with highs reaching up to 23°C (73°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec333235414960636154474035
Data source: Temperature data for Graenna 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 Graenna

In Graenna in September, the total precipitation amount is 80 mm (3.1 in) spread over 12 days.

September Precipitation Trends in Graenna

The chart displays monthly precipitation patterns in Graenna, 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 Graenna, September typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec374645315461718380774752
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Graenna

In Graenna in September, humidity is 82%. With an average temperature of 12°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even a simple walk feel laborious and sticky, which can be quite exhausting for traveling.

September Average Humidity in Graenna

This chart illustrates the average monthly humidity levels in Graenna, 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 Graenna is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%91%89%82%70%65%65%71%82%90%92%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Graenna

In Graenna 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 Graenna for better planning.

Maximum UV Index Levels in Graenna for September

The chart shows the monthly maximum UV Index (UVI) for Graenna 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 Graenna typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123567764211
Data source: Graenna 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 Graenna Compares to Other Months

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

This table compares monthly weather conditions in Graenna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)37 mm (1.5 inches)92%low
February Weather0°C (32°F)46 mm (1.8 inches)91%low
March Weather1°C (35°F)45 mm (1.8 inches)89%moderate
April Weather5°C (41°F)31 mm (1.2 inches)82%moderate
May Weather10°C (49°F)54 mm (2.1 inches)70%high
June Weather16°C (60°F)61 mm (2.4 inches)65%high
July Weather17°C (63°F)70 mm (2.8 inches)65%high
August Weather16°C (61°F)83 mm (3.3 inches)71%high
September Weather12°C (55°F)80 mm (3.1 inches)82%moderate
October Weather8°C (47°F)77 mm (3.0 inches)90%low
November Weather5°C (41°F)47 mm (1.9 inches)92%low
December Weather2°C (35°F)52 mm (2.1 inches)91%low

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