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September Weather in St. Stephen, Canada

Last updated: June 18, 2025

In September, the average temperature in St. Stephen, Canada hovers around 16°C (61°F). Expect a comfortable range where the minimum can dip to 1°C (34°F), while the maximum can reach 32°C (89°F). This month brings about 88 mm (3.5 in) of precipitation spread over 8 days, contributing to the average humidity of 82%. Stay prepared for a mix of weather conditions!

September Temperature in St. Stephen

In September in St. Stephen, the average temperature is 16°C (61°F). The maximum can reach 32°C (89°F), while the minimum can be as low as 1°C (34°F). Overall, it's a great time for travelers looking to enjoy mild weather with the possibility of warm days.

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

The chart illustrates September temperature patterns in St. Stephen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Stephen, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec212330425262686860503726
Data source: Temperature data for St. Stephen 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. Stephen

In St. Stephen in September, the precipitation amount is 88 mm (3.5 in) over the course of 8 days.

September Precipitation Trends in St. Stephen

The chart displays monthly precipitation patterns in St. Stephen, 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. Stephen, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec99907212010791917688109136122
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in St. Stephen

In St. Stephen in September humidity is 82%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making travel feel a bit sluggish and requiring frequent breaks to hydrate and cool down.

September Average Humidity in St. Stephen

This chart illustrates the average monthly humidity levels in St. Stephen, 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. Stephen is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%84%82%80%78%82%84%82%82%82%84%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in St. Stephen

In St. Stephen 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. Stephen.

Maximum UV Index Levels in St. Stephen for September

The chart shows the monthly maximum UV Index (UVI) for St. Stephen 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. Stephen typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799887532
Data source: St. Stephen 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. Stephen Compares to Other Months

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

This table compares monthly weather conditions in St. Stephen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)98 mm (3.9 inches)83%low
February Weather-5°C (23°F)90 mm (3.5 inches)84%moderate
March Weather-1°C (30°F)72 mm (2.8 inches)82%moderate
April Weather5°C (42°F)119 mm (4.7 inches)80%high
May Weather11°C (53°F)107 mm (4.2 inches)78%very high
June Weather17°C (62°F)91 mm (3.6 inches)82%very high
July Weather20°C (68°F)91 mm (3.6 inches)84%very high
August Weather20°C (68°F)76 mm (3.0 inches)82%very high
September Weather16°C (61°F)88 mm (3.5 inches)82%high
October Weather10°C (50°F)109 mm (4.3 inches)82%moderate
November Weather3°C (37°F)136 mm (5.4 inches)84%moderate
December Weather-3°C (26°F)122 mm (4.8 inches)82%low

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