Best year time to visit St. Marys

General weather information about St. Marys

Average annual temperature is 9.1 °C

Absolute maximum temperature: 30.4 °C

Absolute minimum temperature: -18.4 °C

Number of sunny days: 141 days

Number of rainy days: 185 days

Number of snow days: 39 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)7.913.011.826.129.530.429.427.430.226.713.512.7
Average daytime temperature (°C)1.63.13.913.719.623.725.323.421.814.86.65.1
Average temperature (°C)-1.2-2.0-0.67.813.218.520.518.617.011.12.92.2
Average night temperature (°C)-3.6-5.7-4.42.87.313.716.214.513.18.1-0.40.0
Absolute minimum temperature (°C)-13.5-18.4-10.4-5.80.69.012.28.56.8-3.3-8.0-4.7

St. Marys monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.410.511.913.414.715.315.013.912.511.09.79.0
Daylight minimum duration (h)9.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)2.05.85.88.111.511.311.110.19.04.84.82.4
Precipitation (mm)77751141254210212910638785487
Sunny days99101124165101771211
Rainy days10111018714262113231418
Snow days12811100000142

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:

  • May — 11.5(h)
  • June — 11.3(h)
  • July — 11.1(h)
  • August — 10.1(h)

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

  • June — 15.3(h)

The largest precipitation sum in St. Marys is at

  • March — 114(mm)
  • April — 125(mm)
  • July — 129(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.