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September Weather in Lethbridge, Canada

Last updated: June 18, 2025

In September, the average temperature in Lethbridge, Canada hovers around 13°C (56°F), but you can expect some weather extremes, with minimums dipping to -2°C (28°F) and maximums reaching up to 34°C (93°F). The region experiences an average precipitation of 35 mm (1.4 in) over approximately 5 days, alongside an average humidity level of 69%.

September Temperature in Lethbridge

In September in Lethbridge, the average temperature is 13°C (56°F). Maximums can reach up to 34°C (93°F), while minimums can drop as low as -2°C (28°F). This range makes it essential for travelers to pack for both warm and cold weather conditions.

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

The chart illustrates September temperature patterns in Lethbridge, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lethbridge, September typically has an average temperature of 13°C (56°F), with highs reaching up to 34°C (93°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec241730405362676556423325
Data source: Temperature data for Lethbridge 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 Lethbridge

In Lethbridge in September, the precipitation amount is 35 mm (1.4 in) over a span of 5 days.

September Precipitation Trends in Lethbridge

The chart displays monthly precipitation patterns in Lethbridge, 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 Lethbridge, September typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec103123355662282535353422
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lethbridge

In Lethbridge in September humidity is 69%. With an average temperature of 13°C (56°F), this humidity feels like a cool and damp embrace, which might make traveling somewhat uncomfortable as the air weighs down on you, adding to the chill and making your clothes cling.

September Average Humidity in Lethbridge

This chart illustrates the average monthly humidity levels in Lethbridge, 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 Lethbridge is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%88%84%78%77%79%69%69%78%87%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lethbridge

In Lethbridge 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 Lethbridge.

Maximum UV Index Levels in Lethbridge for September

The chart shows the monthly maximum UV Index (UVI) for Lethbridge 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 Lethbridge typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987422
Data source: Lethbridge 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 Lethbridge Compares to Other Months

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

This table compares monthly weather conditions in Lethbridge, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)10 mm (0.4 inches)93%low
February Weather-9°C (17°F)31 mm (1.2 inches)91%moderate
March Weather-1°C (31°F)23 mm (0.9 inches)88%moderate
April Weather4°C (40°F)35 mm (1.4 inches)84%high
May Weather12°C (53°F)56 mm (2.2 inches)78%very high
June Weather16°C (62°F)62 mm (2.4 inches)77%very high
July Weather19°C (67°F)28 mm (1.1 inches)79%very high
August Weather19°C (66°F)25 mm (1.0 inches)69%very high
September Weather13°C (56°F)35 mm (1.4 inches)69%high
October Weather5°C (42°F)35 mm (1.4 inches)78%moderate
November Weather1°C (33°F)34 mm (1.3 inches)87%low
December Weather-4°C (26°F)22 mm (0.8 inches)94%low

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