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Grimsby (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grimsby.
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Climate overview of Grimsby
The climate in Grimsby, Ontario, Canada, is marked by large temperature swings across the seasons, ranging from 26°C (79°F) in July to 1°C (34°F) in January.
The city has a wet climate, receiving around 1012 mm (40 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and very cold winters. April is the wettest month. Sunshine peaks in July, when the city sees around 10.2 hours of sunshine per day.
Grimsby Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grimsby - and find the best time to visit.
Monthly Temperature in Grimsby
In Grimsby, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 26°C (79°F) in July to a very cold 1°C (34°F) in January.
Nighttime temperatures range from 19°C (66°F) in July to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grimsby
Grimsby experiences significant rain/snowfall throughout the year, averaging 1012 mm (40 in) of precipitation annually. The wettest period in Grimsby occurs in April, which receives around 101 mm (4 in) of precipitation. During the driest month, February, Grimsby experiences moderate snowfall, totaling 70 mm (2.8 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Grimsby Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Grimsby
In Grimsby, summer days are longer and more sunny, with daily sunshine hours peaking at 10.2 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 2.4 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Hamilton, Canada (26 KM, 16 Miles).
Daily hours of sunshine
Data from: Hamilton, Canada (26 KM, 16 Miles).
Daily percentage of sunshine
Data from: Hamilton, Canada (26 KM, 16 Miles).
Best Time to Visit Grimsby
Conditions in Grimsby are generally most comfortable in June, July, August and September. They are typically least comfortable in January, February, March, April, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
cold
Apr
wet
May
good
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
good
Nov
cold
Dec
cold
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: June, July, August and September
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Grimsby
What is the best time to visit Grimsby?
June, July, August and September typically offer the most optimal weather in Grimsby. In contrast, January, February, March, April, November and December tend to have less optimal conditions. Grimsby has warm summers and very cold winters.
What temperatures can I expect in Grimsby?
Daytime highs range from 1°C (34°F) in January to 26°C (79°F) in July. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Grimsby get?
Annual rainfall is around 1012 mm (40 in). April is the wettest month with 101 mm (4 in), while February is the driest with 70 mm (2.8 in).
How sunny is Grimsby?
Grimsby receives around 2,120 hours of sunshine per year. July is the sunniest month with 305 hours, while December is the cloudiest with just 72 hours. Overall, Grimsby enjoys abundant sunshine.
Grimsby 3-Day Forecast
Grimsby on the map
Grimsby is highlighted - select any city to see its climate.
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