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September Weather in Flateby, Norway

Last updated: August 27, 2025

In Flateby, Norway, the average temperature in September hovers around 12°C (54°F). Expect minimums to dip to 0°C (31°F), while the mercury can rise to 25°C (77°F). During this time, precipitation averages 84 mm (3.3 in) over approximately 11 days, and the air maintains a notable average humidity of 86%. Use this information to prepare for your visit!

September Temperature in Flateby

In September in Flateby, the average temperature is 12°C (54°F). The maximum can reach 25°C (77°F), and the minimum can be as low as 0°C (31°F). It's a perfect time to visit for those who enjoy mild temperatures and the opportunity to experience a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Flateby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Flateby, September typically has an average temperature of 12°C (54°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec292934425261646054453730
Data source: Temperature data for Flateby 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 Flateby

In Flateby, in September, the precipitation amount is 84 mm (3.3 in) during a period of 11 days.

September Precipitation Trends in Flateby

The chart displays monthly precipitation patterns in Flateby, 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 Flateby, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec5257573580839585841089185
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Flateby

In Flateby in September, humidity is 86%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities uncomfortable and travel challenging due to the heavy, muggy atmosphere.

September Average Humidity in Flateby

This chart illustrates the average monthly humidity levels in Flateby, 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 Flateby is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%92%89%82%73%71%72%77%86%92%93%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Flateby

In Flateby 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 Flateby for better planning.

Maximum UV Index Levels in Flateby for September

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

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

This table compares monthly weather conditions in Flateby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)52 mm (2.1 inches)94%low
February Weather-2°C (29°F)57 mm (2.2 inches)92%low
March Weather1°C (35°F)57 mm (2.3 inches)89%moderate
April Weather6°C (42°F)35 mm (1.4 inches)82%moderate
May Weather11°C (52°F)80 mm (3.2 inches)73%moderate
June Weather16°C (62°F)83 mm (3.3 inches)71%high
July Weather18°C (64°F)95 mm (3.7 inches)72%high
August Weather16°C (61°F)85 mm (3.4 inches)77%moderate
September Weather12°C (54°F)84 mm (3.3 inches)86%moderate
October Weather7°C (45°F)108 mm (4.2 inches)92%low
November Weather3°C (37°F)91 mm (3.6 inches)93%low
December Weather-1°C (31°F)85 mm (3.4 inches)93%low

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