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September Weather in Fredericton, Canada

Last updated: June 18, 2025

In September, the average temperature in Fredericton, Canada hovers around 15°C (59°F). However, temperatures can fluctuate significantly, with a minimum of -2°C (28°F) and a maximum reaching up to 33°C (91°F). Expect about 98 mm (3.9 in) of precipitation spread over 10 days, contributing to an average humidity level of 82%. Make sure to pack accordingly for this diverse climate!

September Temperature in Fredericton

In September in Fredericton, the average temperature is 15°C (59°F). Maximums can reach 33°C (91°F), and minimums can be as low as -2°C (28°F). This variation in temperature makes it essential to pack layers and prepare for diverse weather conditions while traveling.

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

The chart illustrates September temperature patterns in Fredericton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fredericton, September typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (91°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec182028415262676759483424
Data source: Temperature data for Fredericton 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 Fredericton

In Fredericton in September, the total precipitation amount is 98 mm (3.9 in) recorded over a span of 10 days.

September Precipitation Trends in Fredericton

The chart displays monthly precipitation patterns in Fredericton, 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 Fredericton, September typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10091831131161011039098102136118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fredericton

In Fredericton in September, humidity is 82%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and uncomfortable for travelers.

September Average Humidity in Fredericton

This chart illustrates the average monthly humidity levels in Fredericton, 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 Fredericton is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%84%82%80%78%82%84%82%82%82%84%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fredericton

In Fredericton 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 Fredericton.

Maximum UV Index Levels in Fredericton for September

The chart shows the monthly maximum UV Index (UVI) for Fredericton 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 Fredericton typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789887532
Data source: Fredericton 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 Fredericton Compares to Other Months

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

This table compares monthly weather conditions in Fredericton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (19°F)100 mm (4.0 inches)83%low
February Weather-7°C (20°F)91 mm (3.6 inches)84%moderate
March Weather-2°C (28°F)83 mm (3.3 inches)82%moderate
April Weather5°C (41°F)113 mm (4.5 inches)80%high
May Weather11°C (52°F)116 mm (4.6 inches)78%very high
June Weather17°C (62°F)101 mm (4.0 inches)82%very high
July Weather20°C (68°F)103 mm (4.0 inches)84%very high
August Weather19°C (67°F)90 mm (3.5 inches)82%very high
September Weather15°C (59°F)98 mm (3.9 inches)82%high
October Weather9°C (48°F)102 mm (4.0 inches)82%moderate
November Weather1°C (35°F)136 mm (5.3 inches)84%moderate
December Weather-5°C (24°F)118 mm (4.6 inches)82%low

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