When to visit
St. Marys?

Discover the best time of year, based on historical climate, temperature, and precipitation.

St. Marys
Ontario · Canada

The best time to visit St. Marys is May, August, September, when the weather, flight prices, and crowds align. — variable climate

Climate score
October
50

Mixed climate

🌨Cold

4%snow days
Rare snowfall
11%outdoor comfort
Limited outdoor comfort
1%ideal warm days
Rarely warm & sunny
Warming— +1.4° vs. 15 years agoCooling down through the month
Temperature
7–15°C
Moderate temperature variation · Cold nights — bring layers
Feels like
4–13°C
Dry
Precipitation
85mm
Light rain · 13 days
Sunshine
6.3h
Mostly cloudy
Humidity (%)
77%
Dry
Annual Climate Analysis
Temperature, Rain & Feels Like
Rain
Actual Temp
Feels Like
-20°-10°0°10°20°30°40°JanFebMarAprMayJunJulAugSepOctNovDec
International eSIM

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Tourist Crowds
Monthly visitor flow
61
Shoulder season
050100JanFebMarAprMayJunJulAugSepOct61NovDec
Tours & tickets in St. Marys
Browse tours & tickets

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Flights to St. Marys

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Monthly Overview
Score9121232817775798350138
ClimatePolarPolarColdColdMildHumidHumidHumidMildColdColdCold
Temperature-6–0°C-7–1°C-3–7°C2–12°C8–19°C14–25°C17–26°C16–25°C13–22°C7–15°C1–8°C-3–3°C
Feels like-11–-5°C-13–-4°C-8–3°C-2–9°C6–18°C13–25°C17–27°C16–26°C12–21°C4–13°C-3–4°C-8–-2°C
Precipitation90mm
14 days
64mm
11 days
82mm
12 days
93mm
13 days
69mm
11 days
103mm
12 days
122mm
12 days
87mm
12 days
67mm
10 days
85mm
13 days
68mm
13 days
94mm
14 days
Sunshine2.0h
☀︎ 21%
4.8h
☀︎ 45%
5.9h
☀︎ 49%
8.0h
☀︎ 59%
10.9h
☀︎ 74%
12.3h
☀︎ 80%
12.0h
☀︎ 80%
11.0h
☀︎ 79%
9.7h
☀︎ 77%
6.3h
☀︎ 58%
4.6h
☀︎ 47%
1.9h
☀︎ 21%
WindW · 21 km/hW · 23 km/hW · 23 km/hW · 23 km/hW · 19 km/hW · 20 km/hW · 17 km/hW · 17 km/hSW · 18 km/hW · 20 km/hSW · 23 km/hSW · 23 km/h
Humidity (%)81%75%71%69%65%66%73%76%75%77%76%82%
Perfect days0%0%1%6%27%40%42%51%42%11%0%0%
Dry streak6d7d7d7d7d6d6d6d9d7d6d6d
Sunny streak4d6d7d9d15d18d21d19d13d8d6d3d
Extreme cold92%95%77%38%3%————5%46%82%
Temperature+0.9°+3.0°+3.3°-0.3°+1.3°+0.7°+0.9°+0.5°+0.5°+1.4°+0.7°+2.6°
RainfallStableStableStableStableStableStableStableStableStableStableStableStable
Ideal warm days0%0%0%0%7%16%33%22%10%1%0%0%
Outdoor comfort0%0%2%6%28%39%34%42%42%11%1%0%
Dry week odds4%7%9%6%9%4%4%4%13%6%5%4%
Heavy rain2%1%2%2%2%3%3%3%3%3%2%2%
Snow days62%59%35%20%2%————4%28%55%
Muggy days—————4%7%8%2%———
Day length9.4h10.5h12.0h13.4h14.7h15.3h15.0h13.9h12.5h11.0h9.7h9.0h
Tourist CrowdsLow seasonLow seasonLow seasonShoulder seasonShoulder seasonHigh seasonHigh seasonHigh seasonHigh seasonShoulder seasonShoulder seasonShoulder season

Frequently asked questions

What is the best time to visit St. Marys?

The best time to visit St. Marys is May, September, August, June, July, with temperatures between 8 °C and 26 °C. The best month is May. May is shoulder season.

What is the weather like in St. Marys?

St. Marys has a climate with an overall score of 4.4/10. Annual temperatures range from -7 °C to 26 °C.

What is the hottest month in St. Marys?

The hottest month in St. Marys is July, with average highs of 26 °C and lows of 17 °C.

What is the rainiest month in St. Marys?

The rainiest month in St. Marys is July, with an average of 122 mm of precipitation.

When is peak season in St. Marys?

Peak season in St. Marys is June, July, August, September. This is the most popular period, with the highest tourism levels and prices.

When is shoulder season in St. Marys?

Shoulder season in St. Marys falls in April, May, October, November, December. It offers a good balance of decent weather and lower prices compared to peak season.