September Weather in Portneuf, Canada

Last updated: June 18, 2025

In Portneuf, Canada, the average temperature in September hovers around 14°C (58°F), with a range that can dip to a chilly -1°C (31°F) or rise to a warm 29°C (85°F). You can expect 109 mm (4.3 in) of precipitation over approximately 11 days, with humidity levels reaching a notable 81%. Get ready for a month of varied weather!

September Temperature in Portneuf

In September in Portneuf, the average temperature is 14°C (58°F). Maximums can reach 29°C (85°F), while minimums can drop as low as -1°C (31°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Portneuf, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portneuf, September typically has an average temperature of 14°C (58°F), with highs reaching up to 29°C (85°F) and lows dropping to around -1°C (31°F).

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

September Precipitation in Portneuf

In Portneuf in September, the precipitation amount is 109 mm (4.3 in), occurring over a span of 11 days.

September Precipitation Trends in Portneuf

The chart displays monthly precipitation patterns in Portneuf, 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 Portneuf, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 11 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 Portneuf

In Portneuf in September, humidity is 81%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making outdoor adventures sticky and challenging, while also providing a lush, vibrant atmosphere perfect for exploring.

September Average Humidity in Portneuf

This chart illustrates the average monthly humidity levels in Portneuf, 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 Portneuf is approximately 81%, 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 Portneuf

In Portneuf in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Portneuf.

Maximum UV Index Levels in Portneuf for September

The chart shows the monthly maximum UV Index (UVI) for Portneuf 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 Portneuf typically reaches 7, which falls under the high exposure category.

Data source: Portneuf 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 Portneuf Compares to Other Months

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

This table compares monthly weather conditions in Portneuf, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-11°C (13°F)	87 mm (3.4 inches)	95%	low
February Weather	-9°C (16°F)	87 mm (3.4 inches)	93%	moderate
March Weather	-4°C (25°F)	97 mm (3.8 inches)	90%	moderate
April Weather	4°C (39°F)	117 mm (4.6 inches)	87%	high
May Weather	12°C (54°F)	107 mm (4.2 inches)	79%	very high
June Weather	17°C (63°F)	128 mm (5.1 inches)	73%	very high
July Weather	20°C (68°F)	126 mm (5.0 inches)	81%	very high
August Weather	19°C (66°F)	120 mm (4.7 inches)	81%	very high
September Weather	14°C (58°F)	109 mm (4.3 inches)	81%	high
October Weather	8°C (46°F)	139 mm (5.5 inches)	87%	moderate
November Weather	-1°C (31°F)	133 mm (5.2 inches)	89%	moderate
December Weather	-8°C (19°F)	107 mm (4.2 inches)	92%	low