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September Weather in Ancaster, Canada

Last updated: June 18, 2025

In September, the average temperature in Ancaster, Canada hovers around 18°C (64°F), making it a pleasant time to visit. Expect minimum temperatures to drop to 2°C (36°F), while highs can reach up to 32°C (90°F). Be prepared for some rain, as precipitation averages 69 mm (2.7 in) over about 9 days of the month, and with an average humidity of 81%, the air can feel quite humid.

September Temperature in Ancaster

In September in Ancaster, the average temperature is 18°C (64°F). Maximum temperatures can reach up to 32°C (90°F), while minimums can drop as low as 2°C (36°F). This varied climate makes Ancaster an ideal destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Ancaster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ancaster, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec252634445767727064523831
Data source: Temperature data for Ancaster 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 Ancaster

In Ancaster in September, the precipitation amount is 69 mm (2.7 in) spread over 9 days.

September Precipitation Trends in Ancaster

The chart displays monthly precipitation patterns in Ancaster, 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 Ancaster, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec69736510396989389691017573
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ancaster

In Ancaster in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Ancaster

This chart illustrates the average monthly humidity levels in Ancaster, 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 Ancaster 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 Ancaster

In Ancaster 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 Ancaster.

Maximum UV Index Levels in Ancaster for September

The chart shows the monthly maximum UV Index (UVI) for Ancaster 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 Ancaster typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Ancaster 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 Ancaster Compares to Other Months

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

This table compares monthly weather conditions in Ancaster, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)69 mm (2.7 inches)90%low
February Weather-3°C (26°F)73 mm (2.9 inches)90%moderate
March Weather1°C (34°F)64 mm (2.5 inches)87%moderate
April Weather7°C (44°F)103 mm (4.1 inches)87%very high
May Weather14°C (57°F)96 mm (3.8 inches)82%very high
June Weather19°C (67°F)98 mm (3.9 inches)81%very high
July Weather22°C (73°F)93 mm (3.6 inches)79%very high
August Weather21°C (71°F)89 mm (3.5 inches)80%very high
September Weather18°C (64°F)69 mm (2.7 inches)81%high
October Weather11°C (53°F)101 mm (4.0 inches)84%moderate
November Weather3°C (38°F)75 mm (2.9 inches)88%moderate
December Weather-1°C (31°F)73 mm (2.9 inches)87%low

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