September Weather in Tonstad, Norway

Last updated: August 27, 2025

In September, the average temperature in Tonstad, Norway hovers around 9°C (49°F). Expect chilly days with minimums dipping to -1°C (31°F), while the mercury can reach highs of 20°C (68°F). Be prepared for some wet weather, as 204 mm (8.0 in) of precipitation typically falls over 18 days. With an average humidity of 90%, it's the perfect time to bundle up and enjoy the cozy atmosphere!

September Temperature in Tonstad

In September in Tonstad, the average temperature is 9°C (49°F), with maximums reaching 20°C (68°F) and minimums dropping to as low as -1°C (31°F). This climate makes Tonstad a great destination for travelers seeking a mild experience with the possibility of cooler days, perfect for outdoor activities.

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

The chart illustrates September temperature patterns in Tonstad, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tonstad, September typically has an average temperature of 9°C (49°F), with highs reaching up to 20°C (68°F) and lows dropping to around -1°C (31°F).

Data source: Temperature data for Tonstad generated using information from the Copernicus Climate Change Service.

September Precipitation in Tonstad

In Tonstad in September, the total precipitation amount is 204 mm (8.0 in) over the course of 18 days.

September Precipitation Trends in Tonstad

The chart displays monthly precipitation patterns in Tonstad, 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 Tonstad, September typically receives around 204 mm (8.0 inches) of precipitation spread over approximately 18 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Tonstad

In Tonstad in September humidity is 90%. With an average temperature of 9°C (49°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less enjoyable and necessitating extra layers to stay warm and comfortable while traveling.

September Average Humidity in Tonstad

This chart illustrates the average monthly humidity levels in Tonstad, 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 Tonstad is approximately 90%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Tonstad

In Tonstad 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 Tonstad for better planning.

Maximum UV Index Levels in Tonstad for September

The chart shows the monthly maximum UV Index (UVI) for Tonstad 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 Tonstad typically reaches 4, which falls under the moderate exposure category.

Data source: Tonstad 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 Tonstad Compares to Other Months

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

This table compares monthly weather conditions in Tonstad, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	174 mm (6.8 inches)	92%	low
February Weather	-3°C (27°F)	200 mm (7.9 inches)	90%	low
March Weather	-1°C (30°F)	183 mm (7.2 inches)	90%	moderate
April Weather	2°C (36°F)	84 mm (3.3 inches)	87%	moderate
May Weather	7°C (45°F)	111 mm (4.4 inches)	84%	high
June Weather	12°C (54°F)	142 mm (5.6 inches)	81%	high
July Weather	13°C (56°F)	149 mm (5.9 inches)	86%	high
August Weather	12°C (54°F)	188 mm (7.4 inches)	87%	high
September Weather	9°C (49°F)	204 mm (8.0 inches)	90%	moderate
October Weather	5°C (42°F)	262 mm (10.3 inches)	92%	low
November Weather	2°C (35°F)	200 mm (7.9 inches)	93%	low
December Weather	-1°C (31°F)	219 mm (8.6 inches)	90%	low