September Weather in Sem, Norway

Last updated: August 27, 2025

In September, the average temperature in Sem, Norway hovers around 13°C (56°F). Expect minimums of 5°C (40°F) and maximums reaching 23°C (73°F). Be prepared for some rain, as precipitation averages 138 mm (5.4 in) over approximately 14 days, all while maintaining a comfortably high average humidity of 86%.

September Temperature in Sem

In September in Sem, the average temperature is 13°C (56°F). Maximum temperatures can reach 23°C (73°F), while the minimum can drop as low as 5°C (40°F). This makes it an ideal time for travelers who enjoy mild weather with comfortable daytime conditions and cooler evenings.

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

The chart illustrates September temperature patterns in Sem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sem, September typically has an average temperature of 13°C (56°F), with highs reaching up to 23°C (73°F) and lows dropping to around 5°C (40°F).

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

September Precipitation in Sem

In Sem in September, the total precipitation amount is 138 mm (5.4 in) over a span of 14 days.

September Precipitation Trends in Sem

The chart displays monthly precipitation patterns in Sem, 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 Sem, September typically receives around 138 mm (5.4 inches) of precipitation spread over approximately 14 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 Sem

In Sem 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 Sem

This chart illustrates the average monthly humidity levels in Sem, 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 Sem is approximately 86%, 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 Sem

In Sem 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 Sem for better planning.

Maximum UV Index Levels in Sem for September

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

Data source: Sem 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 Sem Compares to Other Months

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

This table compares monthly weather conditions in Sem, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	75 mm (2.9 inches)	94%	low
February Weather	0°C (32°F)	80 mm (3.1 inches)	92%	low
March Weather	2°C (36°F)	77 mm (3.0 inches)	89%	moderate
April Weather	6°C (43°F)	37 mm (1.5 inches)	82%	moderate
May Weather	11°C (52°F)	79 mm (3.1 inches)	73%	moderate
June Weather	16°C (61°F)	90 mm (3.6 inches)	71%	high
July Weather	18°C (64°F)	93 mm (3.7 inches)	72%	high
August Weather	17°C (62°F)	90 mm (3.5 inches)	77%	moderate
September Weather	13°C (56°F)	138 mm (5.4 inches)	86%	moderate
October Weather	9°C (48°F)	155 mm (6.1 inches)	92%	low
November Weather	4°C (40°F)	128 mm (5.1 inches)	93%	low
December Weather	1°C (34°F)	127 mm (5.0 inches)	93%	low