September Weather in Castlegar, Canada

Last updated: June 18, 2025

In Castlegar, Canada, the average temperature in September is a comfortable 12°C (54°F). However, be prepared for a range of temperatures, as lows can dip to -2°C (29°F) and highs can reach up to 30°C (87°F). Expect approximately 69 mm (2.7 in) of precipitation over 9 days, with an average humidity level of 74%. Whether you're planning for rain or shine, it’s a month full of fascinating weather!

September Temperature in Castlegar

In September in Castlegar, the average temperature is 12°C (54°F). Maximums can reach 30°C (87°F), and minimums can be as low as -2°C (29°F). This wide temperature range means travelers should be prepared for both warm and chilly weather during their visit.

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

The chart illustrates September temperature patterns in Castlegar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castlegar, September typically has an average temperature of 12°C (54°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Castlegar

In Castlegar in September, the precipitation amount is 69 mm (2.7 in) spread over 9 days.

September Precipitation Trends in Castlegar

The chart displays monthly precipitation patterns in Castlegar, 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 Castlegar, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Castlegar

In Castlegar in September, humidity is 74%. With an average temperature of 12°C (54°F), this humidity feels like a chilly embrace that can dampen your travel experience, making it essential to dress in layers and prepare for an unexpected drizzle while exploring the sights.

September Average Humidity in Castlegar

This chart illustrates the average monthly humidity levels in Castlegar, 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 Castlegar is approximately 74%, 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 Castlegar

In Castlegar 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 Castlegar.

Maximum UV Index Levels in Castlegar for September

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

Data source: Castlegar 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 Castlegar Compares to Other Months

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

This table compares monthly weather conditions in Castlegar, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	100 mm (4.0 inches)	90%	low
February Weather	-6°C (21°F)	88 mm (3.5 inches)	91%	moderate
March Weather	0°C (32°F)	101 mm (4.0 inches)	89%	moderate
April Weather	4°C (39°F)	92 mm (3.6 inches)	85%	high
May Weather	10°C (50°F)	78 mm (3.1 inches)	82%	very high
June Weather	14°C (58°F)	70 mm (2.8 inches)	81%	very high
July Weather	19°C (66°F)	32 mm (1.3 inches)	84%	very high
August Weather	18°C (65°F)	37 mm (1.5 inches)	75%	very high
September Weather	12°C (54°F)	69 mm (2.7 inches)	74%	high
October Weather	4°C (40°F)	92 mm (3.6 inches)	85%	moderate
November Weather	-1°C (31°F)	118 mm (4.6 inches)	88%	low
December Weather	-6°C (22°F)	114 mm (4.5 inches)	93%	low