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September Weather in Gjerstad, Norway

Last updated: August 27, 2025

In September, the average temperature in Gjerstad, Norway hovers around 12°C (54°F). Expect a wide range, with minimums dipping to 2°C (36°F) and maximums soaring to 25°C (77°F). Precipitation is quite notable, with around 152 mm (6.0 in) of rain spread over 13 days. Overall, the air is quite humid, averaging at 86%, adding a damp chill to the atmosphere.

September Temperature in Gjerstad

In September in Gjerstad, the average temperature is 12°C (54°F). Maximums can reach 25°C (77°F), while minimums can drop to as low as 2°C (36°F). It's a great time to explore Gjerstad with mild weather, perfect for outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Gjerstad, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gjerstad, 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 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec303034415160636054463832
Data source: Temperature data for Gjerstad 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 Gjerstad

In Gjerstad in September, the precipitation amount is 152 mm (6.0 in) occurring over 13 days.

September Precipitation Trends in Gjerstad

The chart displays monthly precipitation patterns in Gjerstad, 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 Gjerstad, September typically receives around 152 mm (6.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec8391914398108120103152162135169
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Gjerstad

In Gjerstad 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 Gjerstad

This chart illustrates the average monthly humidity levels in Gjerstad, 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 Gjerstad is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%88%83%75%74%74%78%86%92%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Gjerstad

In Gjerstad 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 Gjerstad for better planning.

Maximum UV Index Levels in Gjerstad for September

The chart shows the monthly maximum UV Index (UVI) for Gjerstad 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 Gjerstad typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123467754211
Data source: Gjerstad 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 Gjerstad Compares to Other Months

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

This table compares monthly weather conditions in Gjerstad, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)83 mm (3.3 inches)93%low
February Weather-1°C (30°F)91 mm (3.6 inches)91%low
March Weather1°C (34°F)91 mm (3.6 inches)88%moderate
April Weather5°C (42°F)43 mm (1.7 inches)83%moderate
May Weather11°C (51°F)98 mm (3.8 inches)75%high
June Weather16°C (61°F)108 mm (4.3 inches)74%high
July Weather17°C (63°F)120 mm (4.7 inches)74%high
August Weather16°C (60°F)103 mm (4.1 inches)78%moderate
September Weather12°C (54°F)152 mm (6.0 inches)86%moderate
October Weather8°C (46°F)162 mm (6.4 inches)92%low
November Weather3°C (38°F)135 mm (5.3 inches)92%low
December Weather0°C (32°F)169 mm (6.7 inches)92%low

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