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September Weather in Rissa, Norway

Last updated: August 27, 2025

In September, the average temperature in Rissa, Norway hovers around 11°C (52°F). Expect a chilly minimum of 3°C (39°F), while the mercury can rise to a pleasant 20°C (68°F). During this time, precipitation is notable, averaging 167 mm (6.6 in) over 18 days, with an average humidity level of 89%. Plan accordingly for a wet and cool experience!

September Temperature in Rissa

In September in Rissa, the average temperature is 11°C (52°F). The maximum can reach 20°C (68°F), while the minimum can drop as low as 3°C (39°F). This pleasant climate makes Rissa an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Rissa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rissa, September typically has an average temperature of 11°C (52°F), with highs reaching up to 20°C (68°F) and lows dropping to around 3°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec313034404755585752453732
Data source: Temperature data for Rissa 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 Rissa

In Rissa in September, the total precipitation amount is 167 mm (6.6 in) spread over 18 days.

September Precipitation Trends in Rissa

The chart displays monthly precipitation patterns in Rissa, 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 Rissa, September typically receives around 167 mm (6.6 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec1269513812383102101130167178118146
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rissa

In Rissa in September humidity is 89%. With an average temperature of 11°C (52°F), this humidity feels like a cool mist clinging to your skin, making outdoor activities feel damp and chilly, so it's essential to dress in layers and be prepared for a brisk experience while traveling.

September Average Humidity in Rissa

This chart illustrates the average monthly humidity levels in Rissa, 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 Rissa is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%89%84%81%81%81%87%89%91%92%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rissa

In Rissa in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Rissa, you can check the information here.

Maximum UV Index Levels in Rissa for September

The chart shows the monthly maximum UV Index (UVI) for Rissa 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 Rissa typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112356653211
Data source: Rissa 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 Rissa Compares to Other Months

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

This table compares monthly weather conditions in Rissa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)126 mm (5.0 inches)93%low
February Weather-1°C (31°F)95 mm (3.7 inches)92%low
March Weather1°C (34°F)138 mm (5.4 inches)89%low
April Weather4°C (40°F)123 mm (4.8 inches)84%moderate
May Weather9°C (48°F)83 mm (3.3 inches)81%moderate
June Weather13°C (56°F)102 mm (4.0 inches)81%high
July Weather15°C (59°F)101 mm (4.0 inches)81%high
August Weather14°C (57°F)130 mm (5.1 inches)87%moderate
September Weather11°C (52°F)167 mm (6.6 inches)89%moderate
October Weather7°C (45°F)178 mm (7.0 inches)91%low
November Weather3°C (37°F)118 mm (4.7 inches)92%low
December Weather0°C (33°F)146 mm (5.7 inches)94%low

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