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September Weather in Grimsby, Canada

Last updated: June 18, 2025

In Grimsby, Canada, the average temperature in September is a comfortable 19°C (66°F). During this time, temperatures can dip to a cool 9°C (49°F) at night and reach a warm 30°C (86°F) during the day. Expect precipitation of about 65 mm (2.6 in) spread across roughly 8 days, along with an average humidity level of 76%, making for a pleasantly humid atmosphere.

September Temperature in Grimsby

In September in Grimsby, the average temperature is 19°C (66°F). Maximum temperatures can reach 30°C (86°F), while minimum temperatures can dip as low as 9°C (49°F). This pleasant climate makes Grimsby an ideal destination for travelers seeking a comfortable getaway.

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

The chart illustrates September temperature patterns in Grimsby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grimsby, September typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (86°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934435365737266554234
Data source: Temperature data for Grimsby 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 Grimsby

In Grimsby in September, the total precipitation amount is 65 mm (2.6 in) spread over the course of 8 days.

September Precipitation Trends in Grimsby

The chart displays monthly precipitation patterns in Grimsby, 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 Grimsby, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec75836911598788876651158384
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grimsby

In Grimsby in September, humidity is 76%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making travel mildly uncomfortable and encouraging frequent breaks in shaded or air-conditioned areas.

September Average Humidity in Grimsby

This chart illustrates the average monthly humidity levels in Grimsby, 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 Grimsby is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grimsby

In Grimsby 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 Grimsby.

Maximum UV Index Levels in Grimsby for September

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

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

This table compares monthly weather conditions in Grimsby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)75 mm (3.0 inches)91%low
February Weather-2°C (29°F)83 mm (3.3 inches)91%moderate
March Weather1°C (35°F)69 mm (2.7 inches)88%moderate
April Weather6°C (43°F)115 mm (4.5 inches)88%very high
May Weather12°C (53°F)98 mm (3.9 inches)82%very high
June Weather18°C (65°F)78 mm (3.1 inches)79%very high
July Weather23°C (73°F)88 mm (3.5 inches)77%very high
August Weather22°C (72°F)76 mm (3.0 inches)72%very high
September Weather19°C (66°F)65 mm (2.6 inches)76%high
October Weather13°C (56°F)115 mm (4.5 inches)83%moderate
November Weather5°C (42°F)83 mm (3.3 inches)88%moderate
December Weather1°C (35°F)84 mm (3.3 inches)87%low

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