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September Weather in Smithers, United States

Last updated: June 24, 2025

In September, the average temperature in Smithers, United States is a comfortable 20°C (69°F). However, temperatures can vary significantly, ranging from a cool 6°C (43°F) at night to a warm 34°C (93°F) during the day. It's also worth noting that this month sees an average precipitation of 102 mm (4.0 in) spread over 9 days, contributing to an average humidity of 73%.

September Temperature in Smithers

In September, in Smithers, the average temperature is 20°C (69°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 6°C (43°F). This range makes Smithers a perfect destination for travelers seeking pleasant weather and a variety of outdoor activities.

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 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec364146556571757369594540
Data source: Temperature data for Smithers generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Smithers

In Smithers in September, the total precipitation amount is 102 mm (4.0 in) over a span of 9 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 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec10216212713716415212411910211982126
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Smithers

In Smithers in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010109753
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.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)101 mm (4.0 inches)88%moderate
February Weather5°C (41°F)162 mm (6.4 inches)88%moderate
March Weather8°C (47°F)127 mm (5.0 inches)88%high
April Weather13°C (55°F)137 mm (5.4 inches)86%very high
May Weather18°C (65°F)164 mm (6.5 inches)82%very high
June Weather21°C (71°F)152 mm (6.0 inches)84%very high
July Weather24°C (75°F)124 mm (4.9 inches)82%very high
August Weather23°C (73°F)119 mm (4.7 inches)73%very high
September Weather20°C (69°F)102 mm (4.0 inches)73%very high
October Weather15°C (60°F)119 mm (4.7 inches)81%high
November Weather7°C (45°F)82 mm (3.2 inches)89%moderate
December Weather5°C (41°F)126 mm (4.9 inches)86%moderate

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