September Weather in Os, Norway

Last updated: August 27, 2025

In September, the average temperature in Os, Norway hovers around 7°C (44°F). Guests can expect a chilly minimum of -2°C (29°F) and a milder maximum of 19°C (66°F). With an average humidity of 90%, it's essential to stay cozy, especially with about 69 mm (2.7 in) of precipitation spread across 16 days.

September Temperature in Os

In September in Os, the average temperature is 7°C (44°F), with a maximum that can reach 19°C (66°F) and a minimum that can be as low as -2°C (29°F). It's advisable to pack layers to stay comfortable while exploring the sights.

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

The chart illustrates September temperature patterns in Os, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Os, September typically has an average temperature of 7°C (44°F), with highs reaching up to 19°C (66°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Os

In Os in September, the precipitation amount is 69 mm (2.7 in), occurring over a duration of 16 days.

September Precipitation Trends in Os

The chart displays monthly precipitation patterns in Os, 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 Os, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 16 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 Os

In Os in September, humidity is 90%. With an average temperature of 7°C (44°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and damp, which can be quite challenging for traveling.

September Average Humidity in Os

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

In Os 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 Os for better planning.

Maximum UV Index Levels in Os for September

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

Data source: Os 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 Os Compares to Other Months

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

This table compares monthly weather conditions in Os, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	51 mm (2.0 inches)	96%	low
February Weather	-7°C (20°F)	38 mm (1.5 inches)	94%	low
March Weather	-4°C (25°F)	56 mm (2.2 inches)	91%	moderate
April Weather	-1°C (31°F)	55 mm (2.2 inches)	86%	moderate
May Weather	5°C (41°F)	63 mm (2.5 inches)	83%	moderate
June Weather	11°C (52°F)	87 mm (3.4 inches)	81%	high
July Weather	12°C (54°F)	93 mm (3.7 inches)	81%	high
August Weather	10°C (51°F)	108 mm (4.2 inches)	88%	moderate
September Weather	7°C (44°F)	69 mm (2.7 inches)	90%	moderate
October Weather	2°C (36°F)	76 mm (3.0 inches)	93%	low
November Weather	-3°C (26°F)	54 mm (2.1 inches)	95%	low
December Weather	-6°C (22°F)	59 mm (2.3 inches)	97%	low