Best year time to visit Grand Coulee

General weather information about Grand Coulee

Average annual temperature is 5.4 °C

Absolute maximum temperature: 34.2 °C

Absolute minimum temperature: -34.2 °C

Number of sunny days: 209 days

Number of rainy days: 103 days

Number of snow days: 53 days

Look at detailed online map of Grand Coulee

* Weather data for Grand Coulee Canada is based on climate observations for 2026 year

Grand Coulee air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)3.56.43.522.329.631.433.834.231.120.47.67.1
Average daytime temperature (°C)-4.9-4.0-4.08.122.726.826.427.223.410.53.01.5
Average temperature (°C)-9.0-10.3-10.21.015.020.219.619.916.25.6-1.3-3.0
Average night temperature (°C)-12.5-15.3-15.6-4.47.813.813.113.710.11.6-4.4-6.2
Absolute minimum temperature (°C)-26.3-34.2-26.4-21.5-0.810.19.310.03.3-11.4-15.6-11.1

Grand Coulee monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.016.016.016.015.013.011.09.08.0
Daylight mean duration (h)8.610.111.913.815.516.415.914.512.610.79.08.1
Daylight minimum duration (h)8.09.010.012.014.016.015.013.011.09.08.08.0
Sunshine mean duration (h)3.26.78.68.911.313.613.310.89.75.65.45.5
Precipitation (mm)1891362384511532325215
Sunny days151723161414181519161824
Rainy days42071716131611881
Snow days1298700000746

Grand Coulee - weather forecast by months

Grand Coulee weather in januaryGrand Coulee weather in februaryGrand Coulee weather in marchGrand Coulee weather in aprilGrand Coulee weather in mayGrand Coulee weather in juneGrand Coulee weather in julyGrand Coulee weather in augustGrand Coulee weather in septemberGrand Coulee weather in octoberGrand Coulee weather in novemberGrand Coulee weather in december

Best time to visit Grand Coulee:

The best time to visit Grand Coulee during the most sunny months:

  • May — 11.3(h)
  • June — 13.6(h)
  • July — 13.3(h)
  • August — 10.8(h)

Months with the longest average daylight duration in Grand Coulee:

  • May — 15.5(h)
  • June — 16.4(h)
  • July — 15.9(h)

The largest precipitation sum in Grand Coulee is at

  • April — 62(mm)
  • May — 38(mm)
  • June — 45(mm)
  • August — 53(mm)

    • Weather forecast in the closest to Grand Coulee admin centers

    Weather forecast in the closest towns to Grand Coulee

    Explore Grand Coulee

    See also
    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

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