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September Weather in Rotnes, Norway

Last updated: August 27, 2025

In Rotnes, Norway, the average temperature in September hovers around 12°C (53°F). Expect a minimum of 1°C (35°F) and a maximum of 25°C (77°F), offering a pleasant range for outdoor activities. Rainfall is not uncommon, with 106 mm (4.2 in) expected over approximately 13 days. Humidity levels are typically high, averaging at 86%, contributing to the region's unique climate.

September Temperature in Rotnes

In September in Rotnes, the average temperature is 12°C (53°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop to as low as 1°C (35°F). This wide temperature range makes Rotnes a great destination for travelers seeking both mild days and cooler nights during their visits.

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

The chart illustrates September temperature patterns in Rotnes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rotnes, September typically has an average temperature of 12°C (53°F), with highs reaching up to 25°C (77°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec272733415161636053443628
Data source: Temperature data for Rotnes 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 Rotnes

In Rotnes in September, the precipitation amount is 106 mm (4.2 in) spread over a duration of 13 days.

September Precipitation Trends in Rotnes

The chart displays monthly precipitation patterns in Rotnes, 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 Rotnes, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec606465389086103100106130107107
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rotnes

In Rotnes in September humidity is 86%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and prompting the need for warm, layered clothing while exploring the surroundings.

September Average Humidity in Rotnes

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

In Rotnes 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 Rotnes for better planning.

Maximum UV Index Levels in Rotnes for September

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

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

This table compares monthly weather conditions in Rotnes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)60 mm (2.4 inches)94%low
February Weather-3°C (27°F)64 mm (2.5 inches)92%low
March Weather0°C (33°F)65 mm (2.5 inches)89%moderate
April Weather5°C (41°F)38 mm (1.5 inches)82%moderate
May Weather10°C (51°F)90 mm (3.5 inches)73%moderate
June Weather16°C (61°F)86 mm (3.4 inches)71%high
July Weather17°C (63°F)103 mm (4.1 inches)72%high
August Weather15°C (60°F)100 mm (3.9 inches)77%moderate
September Weather12°C (53°F)106 mm (4.2 inches)86%moderate
October Weather7°C (44°F)130 mm (5.1 inches)92%low
November Weather2°C (36°F)107 mm (4.2 inches)93%low
December Weather-2°C (28°F)107 mm (4.2 inches)93%low

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