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September Weather in Moncton, Canada

Last updated: June 18, 2025

In Moncton, Canada, the month of September brings an average temperature of 15°C (59°F). However, temperatures can vary significantly, with a minimum of 0°C (32°F) and a maximum reaching 31°C (88°F). Expect 90 mm (3.5 in) of precipitation over approximately 11 days, coupled with an average humidity of 83%, creating a refreshing yet potentially damp atmosphere.

September Temperature in Moncton

In September in Moncton, the average temperature is 15°C (59°F). Maximums can reach 31°C (88°F), and minimums can be as low as 0°C (32°F). Pack accordingly to enjoy a range of weather while exploring the diverse attractions of Moncton.

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

The chart illustrates September temperature patterns in Moncton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Moncton, 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 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec212228405060676759483626
Data source: Temperature data for Moncton 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 Moncton

In Moncton in September, the total precipitation amounts to 90 mm (3.5 in) over the course of 11 days.

September Precipitation Trends in Moncton

The chart displays monthly precipitation patterns in Moncton, 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 Moncton, September typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9210178911049782729080145103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Moncton

In Moncton in September humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.

September Average Humidity in Moncton

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

In Moncton 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 Moncton.

Maximum UV Index Levels in Moncton for September

The chart shows the monthly maximum UV Index (UVI) for Moncton 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 Moncton typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910887532
Data source: Moncton 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 Moncton Compares to Other Months

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

This table compares monthly weather conditions in Moncton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)92 mm (3.6 inches)82%low
February Weather-6°C (22°F)101 mm (4.0 inches)83%moderate
March Weather-2°C (28°F)78 mm (3.1 inches)82%moderate
April Weather4°C (40°F)91 mm (3.6 inches)82%high
May Weather10°C (50°F)104 mm (4.1 inches)82%very high
June Weather16°C (60°F)97 mm (3.8 inches)84%very high
July Weather19°C (67°F)82 mm (3.2 inches)86%very high
August Weather19°C (67°F)72 mm (2.8 inches)85%very high
September Weather15°C (59°F)90 mm (3.5 inches)83%high
October Weather9°C (48°F)80 mm (3.2 inches)83%moderate
November Weather2°C (37°F)145 mm (5.7 inches)85%moderate
December Weather-3°C (26°F)103 mm (4.0 inches)83%low

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