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September Weather in Sussex, Canada

Last updated: June 18, 2025

In Sussex, Canada, the average temperature in September hovers around 15°C (58°F). Expect temperatures to fluctuate, with a minimum of -2°C (29°F) and a maximum reaching 30°C (86°F). During this month, 91 mm (3.6 in) of precipitation typically falls over 10 days, contributing to an average humidity of 82%. Be prepared for a mix of cool and warm days!

September Temperature in Sussex

In September in Sussex, the average temperature is 15°C (58°F). Maximums can reach 30°C (86°F), while minimums can drop as low as -2°C (29°F). This varied climate makes Sussex an intriguing destination for travelers looking to experience both warmth and chill in a single trip.

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

The chart illustrates September temperature patterns in Sussex, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sussex, September typically has an average temperature of 15°C (58°F), with highs reaching up to 30°C (86°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec202128405060666658473625
Data source: Temperature data for Sussex 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 Sussex

In Sussex in September, the precipitation amount totals 91 mm (3.6 in) over a span of 10 days.

September Precipitation Trends in Sussex

The chart displays monthly precipitation patterns in Sussex, 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 Sussex, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec101104811051079987819193160114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sussex

In Sussex in September humidity is 82%. With an average temperature of 15°C (58°F), this humidity feels like a warm, damp blanket wrapping around you, making outdoor exploration a bit uncomfortable and causing you to sweat lightly even during mild activities.

September Average Humidity in Sussex

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

In Sussex 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 Sussex.

Maximum UV Index Levels in Sussex for September

The chart shows the monthly maximum UV Index (UVI) for Sussex 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 Sussex typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357910887532
Data source: Sussex 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 Sussex Compares to Other Months

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

This table compares monthly weather conditions in Sussex, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)101 mm (4.0 inches)83%low
February Weather-6°C (21°F)104 mm (4.1 inches)84%moderate
March Weather-2°C (28°F)80 mm (3.2 inches)82%moderate
April Weather4°C (40°F)105 mm (4.1 inches)80%high
May Weather10°C (50°F)107 mm (4.2 inches)78%very high
June Weather15°C (60°F)99 mm (3.9 inches)82%very high
July Weather19°C (66°F)87 mm (3.4 inches)84%very high
August Weather19°C (66°F)81 mm (3.2 inches)82%very high
September Weather15°C (58°F)91 mm (3.6 inches)82%high
October Weather9°C (48°F)93 mm (3.7 inches)82%moderate
November Weather2°C (36°F)160 mm (6.3 inches)84%moderate
December Weather-4°C (25°F)114 mm (4.5 inches)82%low

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