September Weather in Groa, Norway

Last updated: August 27, 2025

In September, the average temperature in Groa, Norway hovers around 8°C (47°F), creating a cool atmosphere. You can experience a minimum of -2°C (28°F) and a pleasant maximum of 20°C (68°F). Be prepared for some rain, as the area sees 148 mm (5.8 in) of precipitation over 19 days. Additionally, the air is quite humid, with an average humidity level of 89%.

September Temperature in Groa

In September in Groa, the average temperature is 8°C (47°F). Maximums can reach 20°C (68°F), and minimums can be as low as -2°C (28°F). This makes it a great time for travelers to pack layers and enjoy a mix of mild and chilly weather while exploring.

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

The chart illustrates September temperature patterns in Groa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Groa, September typically has an average temperature of 8°C (47°F), with highs reaching up to 20°C (68°F) and lows dropping to around -2°C (28°F).

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

September Precipitation in Groa

In Groa in September, the precipitation amount is 148 mm (5.8 in) over the course of 19 days.

September Precipitation Trends in Groa

The chart displays monthly precipitation patterns in Groa, 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 Groa, September typically receives around 148 mm (5.8 inches) of precipitation spread over approximately 19 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 Groa

In Groa in September humidity is 89%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less enjoyable and prompting frequent breaks indoors to warm up.

September Average Humidity in Groa

This chart illustrates the average monthly humidity levels in Groa, 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 Groa is approximately 89%, 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 Groa

In Groa 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 Groa for better planning.

Maximum UV Index Levels in Groa for September

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

Data source: Groa 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 Groa Compares to Other Months

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

This table compares monthly weather conditions in Groa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	137 mm (5.4 inches)	93%	low
February Weather	-4°C (25°F)	99 mm (3.9 inches)	92%	low
March Weather	-2°C (28°F)	140 mm (5.5 inches)	89%	moderate
April Weather	1°C (33°F)	140 mm (5.5 inches)	84%	moderate
May Weather	5°C (42°F)	100 mm (3.9 inches)	81%	high
June Weather	11°C (52°F)	128 mm (5.0 inches)	81%	high
July Weather	13°C (55°F)	145 mm (5.7 inches)	81%	high
August Weather	11°C (53°F)	171 mm (6.7 inches)	87%	moderate
September Weather	8°C (47°F)	148 mm (5.8 inches)	89%	moderate
October Weather	3°C (37°F)	179 mm (7.0 inches)	91%	low
November Weather	-2°C (28°F)	118 mm (4.6 inches)	92%	low
December Weather	-4°C (25°F)	150 mm (5.9 inches)	94%	low