Saint Thomas (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Saint Thomas.
Climate overview of Saint Thomas
Temperatures in Saint Thomas, Ontario, Canada, vary greatly throughout the year. July is the hottest month at 27°C (81°F), while February is the coldest at 0°C (32°F).
The city has a wet climate, receiving around 1079 mm (42 in) of rain/snowfall per year. June is the wettest month.
Saint Thomas Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint Thomas — and find the best time to visit.
Monthly Temperature in Saint Thomas
The climate in Saint Thomas is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 27°C (81°F) in July to a very cold 0°C (32°F) in February.
Nighttime temperatures range from 18°C (64°F) in July to -8°C (18°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Saint Thomas
Saint Thomas has a notably wet climate with abundant precipitation, recording 1079 mm (42 in) of rain/snowfall per year. The wettest period in Saint Thomas occurs in June, which receives around 109 mm (4.3 in) of precipitation. During the driest month, February, Saint Thomas experiences moderate snowfall, totaling 71 mm (2.8 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Saint Thomas Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Saint Thomas
Frequently asked questions about the climate in Saint Thomas
What is the best time to visit Saint Thomas?
August and September typically offer the most optimal weather in Saint Thomas. In contrast, January, February, March, April, November and December tend to have less optimal conditions.
What temperatures can I expect in Saint Thomas?
Daytime highs range from 0°C (32°F) in February to 27°C (81°F) in July. Nighttime lows range from -8°C (18°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Saint Thomas get?
Annual rainfall is around 1079 mm (42 in). June is the wettest month with 109 mm (4.3 in), while February is the driest with 71 mm (2.8 in).
Saint Thomas 3-Day Forecast
Saint Thomas (ON) 3-Day Forecast
Saint Thomas on the map
Saint Thomas is highlighted — select any city to see its climate.
Popular this month
Where to go in June — average daytime high across popular destinations.
Montréal
25°C (77°F) Niagara Falls
25°C (77°F) Ottawa25°C (77°F) Quebec City
23°C (73°F) Toronto22°C (72°F) Calgary20°C (68°F) Vancouver19°C (66°F) Whistler15°C (59°F) 
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