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September Weather in Lachute, Canada

Last updated: June 18, 2025

In September, the average temperature in Lachute, Canada hovers around 15°C (59°F). While daytime highs can reach a warm 31°C (88°F), be prepared for cooler moments as temperatures may drop to a brisk -1°C (31°F). Expect around 98 mm (3.8 in) of precipitation over 10 days, and with an average humidity of 78%, the air will feel quite moist.

September Temperature in Lachute

In September in Lachute, the average temperature is 15°C (59°F). Maximums can reach 31°C (88°F), while minimums can drop to as low as -1°C (31°F). This temperature range makes Lachute a versatile destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Lachute, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lachute, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (88°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec141726405564696759473120
Data source: Temperature data for Lachute 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 Lachute

In Lachute in September, the precipitation amount is 98 mm (3.8 in) spread over a period of 10 days.

September Precipitation Trends in Lachute

The chart displays monthly precipitation patterns in Lachute, 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 Lachute, September typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8894961211151161291179813711597
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lachute

In Lachute in September, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

September Average Humidity in Lachute

This chart illustrates the average monthly humidity levels in Lachute, 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 Lachute is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lachute

In Lachute 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 Lachute.

Maximum UV Index Levels in Lachute for September

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

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

This table compares monthly weather conditions in Lachute, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)88 mm (3.5 inches)93%low
February Weather-8°C (17°F)93 mm (3.7 inches)92%moderate
March Weather-3°C (26°F)95 mm (3.8 inches)86%moderate
April Weather4°C (40°F)121 mm (4.8 inches)85%high
May Weather13°C (55°F)115 mm (4.5 inches)80%very high
June Weather18°C (64°F)116 mm (4.6 inches)74%very high
July Weather21°C (69°F)129 mm (5.1 inches)76%very high
August Weather19°C (67°F)117 mm (4.6 inches)75%very high
September Weather15°C (59°F)98 mm (3.8 inches)78%high
October Weather8°C (47°F)137 mm (5.4 inches)86%moderate
November Weather0°C (32°F)115 mm (4.5 inches)88%moderate
December Weather-7°C (20°F)97 mm (3.8 inches)89%low

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