September Weather in Smithers, Canada

Last updated: June 18, 2025

In September, the average temperature in Smithers, Canada hovers around 8°C (46°F), with a minimum dipping to -4°C (25°F) and a maximum peaking at 23°C (74°F). Expect 112 mm (4.4 in) of precipitation spread across 16 days, contributing to a high average humidity of 91%. Prepare for some chilly and damp days!

September Temperature in Smithers

In September in Smithers, the average temperature is 8°C (46°F). The maximum can reach 23°C (74°F) and the minimum can be as low as -4°C (25°F). It's a great time to visit if you’re prepared for a mix of mild and chilly weather.

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

The chart illustrates September temperature patterns in Smithers, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Smithers, September typically has an average temperature of 8°C (46°F), with highs reaching up to 23°C (74°F) and lows dropping to around -4°C (25°F).

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

September Precipitation in Smithers

In Smithers in September, the precipitation amount is 112 mm (4.4 in) spread over 16 days.

September Precipitation Trends in Smithers

The chart displays monthly precipitation patterns in Smithers, 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 Smithers, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 16 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 Smithers

In Smithers in September, humidity is 91%. With an average temperature of 8°C (46°F), this humidity feels like a thick blanket enveloping you, making outdoor activities uncomfortable and leaving a chill that seeps into your bones, creating an atmosphere that is damp and heavy, perfect for cozy indoor explorations but challenging for leisurely travel.

September Average Humidity in Smithers

This chart illustrates the average monthly humidity levels in Smithers, 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 Smithers is approximately 91%, 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 Smithers

In Smithers in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Smithers, you can refer to this Hourly UV Index in Smithers.

Maximum UV Index Levels in Smithers for September

The chart shows the monthly maximum UV Index (UVI) for Smithers 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 Smithers typically reaches 6, which falls under the high exposure category.

Data source: Smithers 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 Smithers Compares to Other Months

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

This table compares monthly weather conditions in Smithers, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	102 mm (4.0 inches)	96%	low
February Weather	-9°C (16°F)	76 mm (3.0 inches)	94%	low
March Weather	-3°C (27°F)	82 mm (3.2 inches)	93%	moderate
April Weather	1°C (33°F)	53 mm (2.1 inches)	91%	moderate
May Weather	7°C (44°F)	65 mm (2.5 inches)	88%	very high
June Weather	10°C (51°F)	82 mm (3.2 inches)	84%	very high
July Weather	13°C (55°F)	83 mm (3.3 inches)	87%	very high
August Weather	12°C (54°F)	75 mm (2.9 inches)	88%	high
September Weather	8°C (46°F)	112 mm (4.4 inches)	91%	high
October Weather	1°C (35°F)	125 mm (4.9 inches)	95%	moderate
November Weather	-3°C (27°F)	151 mm (5.9 inches)	98%	low
December Weather	-8°C (17°F)	91 mm (3.6 inches)	98%	low