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September Weather in Svelvik, Norway

Last updated: August 27, 2025

In September, the average temperature in Svelvik, Norway hovers around 13°C (56°F). Temperatures can range from a chilly 1°C (33°F) at the lowest to a warm 26°C (78°F) at the highest. Expect about 111 mm (4.4 in) of precipitation spread over 13 days during the month, coupled with a notably high average humidity of 86%.

September Temperature in Svelvik

In September in Svelvik, the average temperature is 13°C (56°F), with maximums reaching 26°C (78°F) and minimums dropping as low as 1°C (33°F). This mild weather makes Svelvik an ideal travel destination for those seeking a comfortable climate.

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

The chart illustrates September temperature patterns in Svelvik, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Svelvik, September typically has an average temperature of 13°C (56°F), with highs reaching up to 26°C (78°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec313036445362656255463831
Data source: Temperature data for Svelvik 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 Svelvik

In Svelvik in September, the precipitation amount reaches 111 mm (4.4 in) over the course of 13 days.

September Precipitation Trends in Svelvik

The chart displays monthly precipitation patterns in Svelvik, 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 Svelvik, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec6369693577849181111127105109
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Svelvik

In Svelvik in September, humidity is 86%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making outdoor activities slightly uncomfortable and prompting travelers to seek shade or air-conditioned spaces frequently.

September Average Humidity in Svelvik

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

In Svelvik 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 Svelvik for better planning.

Maximum UV Index Levels in Svelvik for September

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

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

This table compares monthly weather conditions in Svelvik, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)63 mm (2.5 inches)94%low
February Weather-1°C (31°F)69 mm (2.7 inches)92%low
March Weather2°C (36°F)69 mm (2.7 inches)89%moderate
April Weather6°C (44°F)35 mm (1.4 inches)82%moderate
May Weather12°C (53°F)77 mm (3.0 inches)73%moderate
June Weather17°C (63°F)84 mm (3.3 inches)71%high
July Weather18°C (65°F)91 mm (3.6 inches)72%high
August Weather17°C (62°F)81 mm (3.2 inches)77%moderate
September Weather13°C (56°F)111 mm (4.4 inches)86%moderate
October Weather8°C (47°F)127 mm (5.0 inches)92%low
November Weather3°C (38°F)105 mm (4.1 inches)93%low
December Weather0°C (32°F)108 mm (4.3 inches)93%low

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