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September Weather in Vallentuna, Sweden

Last updated: August 27, 2025

The average temperature in Vallentuna, Sweden during September hovers around 13°C (55°F). Expect a minimum of 0°C (32°F) and a maximum reaching 25°C (77°F). With an average precipitation of 50 mm (2.0 in) spread over 9 days, you might want to keep an umbrella handy. Additionally, the average humidity remains high at 85%, adding a touch of moisture to the air.

September Temperature in Vallentuna

In September in Vallentuna, the average temperature is 13°C (55°F). Maximums can reach 25°C (77°F) and minimums can be as low as 0°C (32°F). Be prepared for a range of temperatures and pack accordingly to enjoy your travels comfortably.

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

The chart illustrates September temperature patterns in Vallentuna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vallentuna, September typically has an average temperature of 13°C (55°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec313035415162646255463933
Data source: Temperature data for Vallentuna 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 Vallentuna

In Vallentuna in September, the precipitation amount is 50 mm (2.0 in) over the course of 9 days.

September Precipitation Trends in Vallentuna

The chart displays monthly precipitation patterns in Vallentuna, 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 Vallentuna, September typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec353341285557597650664259
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Vallentuna

In Vallentuna in September, humidity is 85%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even short walks feel exhausting and urging travelers to seek shade and refreshment frequently.

September Average Humidity in Vallentuna

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

In Vallentuna 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 Vallentuna for better planning.

Maximum UV Index Levels in Vallentuna for September

The chart shows the monthly maximum UV Index (UVI) for Vallentuna 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 Vallentuna typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123457754211
Data source: Vallentuna 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 Vallentuna Compares to Other Months

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

This table compares monthly weather conditions in Vallentuna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)35 mm (1.4 inches)90%low
February Weather-1°C (30°F)33 mm (1.3 inches)88%low
March Weather1°C (35°F)41 mm (1.6 inches)89%moderate
April Weather5°C (41°F)28 mm (1.1 inches)85%moderate
May Weather10°C (51°F)55 mm (2.2 inches)77%moderate
June Weather16°C (62°F)57 mm (2.2 inches)76%high
July Weather18°C (64°F)59 mm (2.3 inches)74%high
August Weather17°C (63°F)76 mm (3.0 inches)77%moderate
September Weather13°C (55°F)50 mm (2.0 inches)85%moderate
October Weather8°C (47°F)66 mm (2.6 inches)89%low
November Weather4°C (39°F)42 mm (1.6 inches)90%low
December Weather1°C (33°F)59 mm (2.3 inches)87%low

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