Best year time to visit Castle Island

General weather information about Castle Island

Average annual temperature is 5.7 °C

Absolute maximum temperature: 28.8 °C

Absolute minimum temperature: -30.3 °C

Number of sunny days: 169 days

Number of rainy days: 144 days

Number of snow days: 52 days

Look at detailed online map of Castle Island

* Weather data for Castle Island Canada is based on climate observations for 2026 year

Castle Island air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)7.15.49.719.828.128.827.828.323.220.69.77.6
Average daytime temperature (°C)-2.5-2.4-0.111.222.222.922.822.818.810.54.02.3
Average temperature (°C)-6.4-7.8-7.04.515.317.017.517.213.35.60.0-1.8
Average night temperature (°C)-9.7-11.5-12.0-1.09.612.213.612.89.22.1-2.6-4.7
Absolute minimum temperature (°C)-21.5-30.3-20.2-8.95.06.79.27.94.1-9.4-9.0-10.1

Castle Island monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)8.010.012.015.016.017.016.015.013.011.09.07.0
Daylight mean duration (h)8.19.811.914.015.917.016.514.812.710.68.67.5
Daylight minimum duration (h)7.08.010.013.015.016.015.013.011.09.07.07.0
Sunshine mean duration (h)4.54.88.110.412.711.511.910.69.46.55.54.1
Precipitation (mm)121883062167163100402155
Sunny days1781714131051014192121
Rainy days491121820262116737
Snow days101113400000563

Castle Island - weather forecast by months

Castle Island weather in januaryCastle Island weather in februaryCastle Island weather in marchCastle Island weather in aprilCastle Island weather in mayCastle Island weather in juneCastle Island weather in julyCastle Island weather in augustCastle Island weather in septemberCastle Island weather in octoberCastle Island weather in novemberCastle Island weather in december

Best time to visit Castle Island:

The best time to visit Castle Island during the most sunny months:

  • April — 10.4(h)
  • May — 12.7(h)
  • June — 11.5(h)
  • July — 11.9(h)
  • August — 10.6(h)

Months with the longest average daylight duration in Castle Island:

  • May — 15.9(h)
  • June — 17.0(h)
  • July — 16.5(h)

The largest precipitation sum in Castle Island is at

  • June — 167(mm)
  • July — 163(mm)
  • August — 100(mm)

    • Weather forecast in the closest to Castle Island admin centers

    Weather forecast in the closest towns to Castle Island

    Explore Castle Island

    See also
    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

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