Like many regions in Canada, St. Thomas-Elgin has four distinct seasons: spring, summer, autumn (fall) and winter, which can be very different for newcomers that are used to more moderate climates. Temperatures can range from -20°c (-68°F) in the winter to 35°C (95°F) in the summer, creating dramatic changes in landscapes and lifestyle.


In St. Thomas-Elgin, spring generally begins as early as March and is a rainy season. Temperatures range between 5-18°C (41-64°F) and grow warmer day by day even though the nights remain cool. The rain and sun make the plants begin to bloom again in the spring.


In the summer months of June, July and August, the weather in St. Thomas-Elgin can be as hot as any tropical country, reaching 30°C (86°F) or higher. Summer temperatures begin rising in late May and last until mid-September. This season is hot and dry with occasional thunder and rainstorms.

Autumn (Fall)

The autumn (also referred to as ‘fall’) in Canada begins in mid-September. Fewer hours of daylight cause the leaves of many trees to change colour and fall off, resulting in stunning multi-coloured landscapes throughout the region. Temperatures begin around 20°C (68°F) and decrease to approximately 5°C (41°F). The first snowfall tends to occur in November, although it can be as early as October or as late as December depending on the year.


Winter is undoubtedly Canada’s most famous season. During the winter months of December, January, February and March, the temperature remains below 0°C (32°F) most of the time. Snow begins to fall in November and December and usually lasts until March of the following year.

St. Thomas-Elgin enjoys relatively higher winter temperatures that rarely drop below -25°C (-13°F) compared to other parts of the country that often endure -25°C or even colder temperatures for weeks at a time.

For more information about dressing for cold weather and staying safe in extreme cold temperatures, check out Southwestern Public Health's resources. 


Elgin County
City of St.Thomas
YW St.Thomas
Province of Ontario