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September Weather in St. George, Canada

Last updated: June 18, 2025

In September, the average temperature in St. George, Canada hovers around 17°C (63°F). Expect a range of temperatures, with minimums dipping to 1°C (34°F) and maxing out at 32°C (90°F). The weather is also characterized by 71 mm (2.8 in) of precipitation spread over 10 days, while the air maintains an average humidity level of 81%. Be prepared for a mix of weather conditions!

September Temperature in St. George

In September in St. George, the average temperature is 17°C (63°F). Maximums can reach 32°C (90°F), while minimums can drop as low as 1°C (34°F). Be prepared for a range of temperatures during your travels.

September Weather in St. George: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in St. George, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. George, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec242533435666727063523730
Data source: Temperature data for St. George 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 St. George

In St. George in September, the precipitation amount is 71 mm (2.8 in) over a duration of 10 days.

September Precipitation Trends in St. George

The chart displays monthly precipitation patterns in St. George, 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 St. George, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec70746598971038290711007571
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in St. George

In St. George in September humidity is 81%. With an average temperature of 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

September Average Humidity in St. George

This chart illustrates the average monthly humidity levels in St. George, 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 St. George is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%88%87%83%81%79%80%81%84%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in St. George

In St. George 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 St. George.

Maximum UV Index Levels in St. George for September

The chart shows the monthly maximum UV Index (UVI) for St. George 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 St. George typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997542
Data source: St. George 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 St. George Compares to Other Months

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

This table compares monthly weather conditions in St. George, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)70 mm (2.7 inches)90%low
February Weather-4°C (26°F)74 mm (2.9 inches)90%moderate
March Weather1°C (33°F)65 mm (2.6 inches)87%moderate
April Weather6°C (44°F)98 mm (3.9 inches)87%very high
May Weather14°C (57°F)97 mm (3.8 inches)82%very high
June Weather19°C (67°F)103 mm (4.1 inches)81%very high
July Weather22°C (72°F)82 mm (3.2 inches)79%very high
August Weather21°C (70°F)90 mm (3.5 inches)80%very high
September Weather17°C (63°F)71 mm (2.8 inches)81%high
October Weather11°C (52°F)100 mm (3.9 inches)84%moderate
November Weather3°C (38°F)75 mm (3.0 inches)88%moderate
December Weather-1°C (30°F)70 mm (2.8 inches)87%low

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