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September Weather in Halden, Norway

Last updated: August 27, 2025

In Halden, Norway, the average temperature in September is a cool 13°C (55°F), with temperatures ranging from a brisk -1°C (31°F) to a pleasant 23°C (73°F). Be prepared for some rain, as the area sees an average precipitation of 91 mm (3.6 in) over 13 days. The air is often quite humid, with an average humidity of 86%.

September Temperature in Halden

In September in Halden, the average temperature is 13°C (55°F). The maximum can reach 23°C (73°F) and the minimum can be as low as -1°C (31°F). This makes it a great time to pack layers and enjoy outdoor activities while experiencing a range of temperatures.

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

The chart illustrates September temperature patterns in Halden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Halden, September typically has an average temperature of 13°C (55°F), with highs reaching up to 23°C (73°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec333236435261646155473934
Data source: Temperature data for Halden 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 Halden

In Halden in September, the precipitation amount is 91 mm (3.6 in) spread over 13 days.

September Precipitation Trends in Halden

The chart displays monthly precipitation patterns in Halden, 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 Halden, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec51605832687695102911067978
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Halden

In Halden in September humidity is 86%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket clinging to your skin, making travel quite uncomfortable and urging you to seek cooler, dryer spots.

September Average Humidity in Halden

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

In Halden 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 Halden for better planning.

Maximum UV Index Levels in Halden for September

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

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

This table compares monthly weather conditions in Halden, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)51 mm (2.0 inches)94%low
February Weather0°C (32°F)60 mm (2.4 inches)92%low
March Weather2°C (36°F)58 mm (2.3 inches)89%moderate
April Weather6°C (44°F)31 mm (1.2 inches)82%moderate
May Weather11°C (53°F)68 mm (2.7 inches)73%moderate
June Weather16°C (62°F)76 mm (3.0 inches)71%high
July Weather18°C (64°F)95 mm (3.7 inches)72%high
August Weather16°C (61°F)102 mm (4.0 inches)77%moderate
September Weather13°C (55°F)91 mm (3.6 inches)86%moderate
October Weather8°C (47°F)106 mm (4.2 inches)92%low
November Weather4°C (39°F)79 mm (3.1 inches)93%low
December Weather1°C (34°F)78 mm (3.1 inches)93%low

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