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September Weather in Finnsnes, Norway

Last updated: August 27, 2025

In September, the average temperature in Finnsnes, Norway hovers around 8°C (47°F). Visitors can expect a minimum of -1°C (30°F) and a maximum of 21°C (70°F), making for a varied climate. Precipitation is notable, with an average of 129 mm (5.1 in) spread over 17 days, and the atmosphere is often quite humid, with an average humidity level of 91%.

September Temperature in Finnsnes

In September in Finnsnes, the average temperature is 8°C (47°F). Maximums can reach 21°C (70°F) and minimums can be as low as -1°C (30°F). Be prepared for a range of temperatures, making layered clothing a smart choice for your travels.

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

The chart illustrates September temperature patterns in Finnsnes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Finnsnes, September typically has an average temperature of 8°C (47°F), with highs reaching up to 21°C (70°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec232126334150555447383023
Data source: Temperature data for Finnsnes 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 Finnsnes

In Finnsnes in September, the total precipitation amount reaches 129 mm (5.1 in), occurring over a span of 17 days.

September Precipitation Trends in Finnsnes

The chart displays monthly precipitation patterns in Finnsnes, 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 Finnsnes, September typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec9010013110381123891261298910184
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Finnsnes

In Finnsnes in September, humidity is 91%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making it important to dress in layers while traveling.

September Average Humidity in Finnsnes

This chart illustrates the average monthly humidity levels in Finnsnes, 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 Finnsnes is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%93%91%89%83%84%85%88%92%92%92%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Finnsnes

In Finnsnes in September, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Finnsnes, you can visit Hourly UV Index in Finnsnes.

Maximum UV Index Levels in Finnsnes for September

The chart shows the monthly maximum UV Index (UVI) for Finnsnes 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 Finnsnes typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112345542110
Data source: Finnsnes 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 Finnsnes Compares to Other Months

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

This table compares monthly weather conditions in Finnsnes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)90 mm (3.5 inches)95%low
February Weather-6°C (21°F)100 mm (4.0 inches)93%low
March Weather-3°C (27°F)131 mm (5.1 inches)91%low
April Weather0°C (33°F)103 mm (4.0 inches)89%moderate
May Weather5°C (41°F)81 mm (3.2 inches)83%moderate
June Weather10°C (51°F)123 mm (4.8 inches)84%moderate
July Weather13°C (56°F)89 mm (3.5 inches)85%moderate
August Weather12°C (54°F)126 mm (4.9 inches)88%moderate
September Weather8°C (47°F)129 mm (5.1 inches)91%low
October Weather3°C (38°F)88 mm (3.5 inches)92%low
November Weather-1°C (31°F)101 mm (4.0 inches)92%low
December Weather-5°C (23°F)84 mm (3.3 inches)94%low

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