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September Weather in Port Williams, Canada

Last updated: June 18, 2025

In September, the average temperature in Port Williams, Canada hovers around 16°C (60°F). Expect lows of -1°C (31°F) and highs reaching 28°C (83°F). Be prepared for 94 mm (3.7 in) of rain spread across 8 days, contributing to an average humidity of 83%. Enjoy your stay while navigating the varied weather!

September Temperature in Port Williams

In September in Port Williams, the average temperature is 16°C (60°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as -1°C (31°F). This diverse range of temperatures makes it essential to pack layers for your travels to Port Williams during this month.

September Weather in Port Williams: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Port Williams, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Williams, September typically has an average temperature of 16°C (60°F), with highs reaching up to 28°C (83°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec252530415061676760503929
Data source: Temperature data for Port Williams 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 Port Williams

In Port Williams in September, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.

September Precipitation Trends in Port Williams

The chart displays monthly precipitation patterns in Port Williams, 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 Port Williams, September typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec851069110510210392929482144112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Port Williams

In Port Williams in September humidity is 83%. With an average temperature of 16°C (60°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit uncomfortable for traveling.

September Average Humidity in Port Williams

This chart illustrates the average monthly humidity levels in Port Williams, 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 Port Williams is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%82%82%82%84%86%85%83%83%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Port Williams

In Port Williams 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 Port Williams.

Maximum UV Index Levels in Port Williams for September

The chart shows the monthly maximum UV Index (UVI) for Port Williams 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 Port Williams typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: Port Williams 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 Port Williams Compares to Other Months

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

This table compares monthly weather conditions in Port Williams, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)85 mm (3.3 inches)82%low
February Weather-4°C (25°F)106 mm (4.2 inches)83%moderate
March Weather-1°C (30°F)91 mm (3.6 inches)82%moderate
April Weather5°C (41°F)105 mm (4.1 inches)82%high
May Weather10°C (50°F)102 mm (4.0 inches)82%very high
June Weather16°C (61°F)103 mm (4.1 inches)84%very high
July Weather19°C (67°F)92 mm (3.6 inches)86%very high
August Weather20°C (68°F)92 mm (3.6 inches)85%very high
September Weather16°C (60°F)94 mm (3.7 inches)83%high
October Weather10°C (50°F)82 mm (3.2 inches)83%moderate
November Weather4°C (39°F)144 mm (5.7 inches)85%moderate
December Weather-2°C (29°F)112 mm (4.4 inches)83%low

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