Best year time to visit St. Marys

General weather information about St. Marys

Average annual temperature is 7.8 °C

Absolute maximum temperature: 28.5 °C

Absolute minimum temperature: -27.4 °C

Number of sunny days: 131 days

Number of rainy days: 203 days

Number of snow days: 31 days

Look at detailed online map of St. Marys

* Weather data for St. Marys Canada is based on climate observations for 2026 year

St. Marys air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)11.58.67.912.425.327.628.524.126.222.014.013.1
Average daytime temperature (°C)3.9-0.32.08.012.017.423.321.520.615.47.14.9
Average temperature (°C)0.9-4.5-1.03.87.713.419.718.516.911.93.71.9
Average night temperature (°C)-2.0-8.2-3.60.34.410.417.215.714.39.21.0-0.4
Absolute minimum temperature (°C)-11.0-27.4-8.4-5.5-0.16.514.110.37.53.6-5.1-5.1

St. Marys monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.210.411.913.514.915.615.314.112.510.99.58.8
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.08.08.0
Sunshine mean duration (h)2.95.05.99.19.26.87.88.78.06.24.43.7
Precipitation (mm)24410384449212016820698230180283
Sunny days81013181311771311119
Rainy days18117101819242417201817
Snow days5711200000015

St. Marys - weather forecast by months

St. Marys weather in januarySt. Marys weather in februarySt. Marys weather in marchSt. Marys weather in aprilSt. Marys weather in maySt. Marys weather in juneSt. Marys weather in julySt. Marys weather in augustSt. Marys weather in septemberSt. Marys weather in octoberSt. Marys weather in novemberSt. Marys weather in december

Best time to visit St. Marys:

The best time to visit St. Marys during the most sunny months:

  • April — 9.1(h)
  • May — 9.2(h)
  • August — 8.7(h)

Months with the longest average daylight duration in St. Marys:

  • June — 15.6(h)
  • July — 15.3(h)

The largest precipitation sum in St. Marys is at

  • January — 244(mm)
  • August — 206(mm)
  • October — 230(mm)
  • December — 283(mm)

    • Weather forecast in the closest to St. Marys admin centers

    Weather forecast in the closest towns to St. Marys

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    Frequently asked questions

    When is the best time to visit St. Marys?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit St. Marys.
    What is the weather like in St. Marys?
    See average temperature, rainfall and daylight hours for St. Marys by month in the table above.
    How many sunny days does St. Marys have?
    The monthly weather statistics above show sunshine and rainfall patterns for St. Marys throughout the year.