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September Weather in Stephenville, Canada

Last updated: June 18, 2025

In Stephenville, Canada, the average temperature in September hovers around 13°C (57°F), with minimums dipping to 3°C (38°F) and maximums reaching up to 23°C (73°F). Expect 144 mm (5.7 in) of precipitation over approximately 17 days, accompanied by high average humidity levels of 87%.

September Temperature in Stephenville

In September in Stephenville, the average temperature is 13°C (57°F). Maximums can reach 23°C (73°F) and minimums can be as low as 3°C (38°F). This mild weather makes Stephenville an ideal destination for travelers looking to enjoy outdoor activities while avoiding extreme temperatures.

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

The chart illustrates September temperature patterns in Stephenville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stephenville, September typically has an average temperature of 13°C (57°F), with highs reaching up to 23°C (73°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec242226354353626456473829
Data source: Temperature data for Stephenville 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 Stephenville

In Stephenville in September, the precipitation amount is 144 mm (5.7 in) over the course of 17 days.

September Precipitation Trends in Stephenville

The chart displays monthly precipitation patterns in Stephenville, 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 Stephenville, September typically receives around 144 mm (5.7 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec10913112011211112389115144148172163
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stephenville

In Stephenville in September humidity is 87%. With an average temperature of 13°C (57°F), this humidity feels like a damp blanket wrapping around you, making it feel heavier and less comfortable for traveling, as every step seems to require more effort in the muggy air.

September Average Humidity in Stephenville

This chart illustrates the average monthly humidity levels in Stephenville, 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 Stephenville is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%90%89%88%87%85%90%90%87%84%83%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stephenville

In Stephenville 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 Stephenville, you can refer to this Hourly UV Index in Stephenville.

Maximum UV Index Levels in Stephenville for September

The chart shows the monthly maximum UV Index (UVI) for Stephenville 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 Stephenville typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789886422
Data source: Stephenville 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 Stephenville Compares to Other Months

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

This table compares monthly weather conditions in Stephenville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)109 mm (4.3 inches)88%low
February Weather-6°C (22°F)131 mm (5.2 inches)90%moderate
March Weather-3°C (27°F)120 mm (4.7 inches)89%moderate
April Weather2°C (36°F)112 mm (4.4 inches)88%high
May Weather6°C (43°F)111 mm (4.4 inches)87%very high
June Weather12°C (54°F)123 mm (4.8 inches)85%very high
July Weather16°C (62°F)89 mm (3.5 inches)90%very high
August Weather18°C (65°F)114 mm (4.5 inches)90%very high
September Weather13°C (57°F)144 mm (5.7 inches)87%high
October Weather8°C (47°F)148 mm (5.8 inches)84%moderate
November Weather3°C (38°F)172 mm (6.8 inches)83%low
December Weather-1°C (30°F)163 mm (6.4 inches)85%low

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