Best year time to visit Great Falls

General weather information about Great Falls

Average annual temperature is 14.4 °C

Absolute maximum temperature: 38.2 °C

Absolute minimum temperature: -9.4 °C

Number of sunny days: 175 days

Number of rainy days: 189 days

Number of snow days: 1 day

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* Weather data for Great Falls United States is based on climate observations for 2026 year

Great Falls air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)18.123.226.030.929.433.138.233.836.527.624.316.2
Average daytime temperature (°C)9.812.013.122.023.127.431.930.626.721.013.510.3
Average temperature (°C)5.66.57.215.116.621.225.524.521.015.27.75.7
Average night temperature (°C)2.32.22.49.610.715.720.619.516.210.43.12.1
Absolute minimum temperature (°C)-3.1-9.4-5.01.74.711.217.514.910.34.2-5.5-3.9

Great Falls monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.810.712.013.214.314.914.613.712.411.210.19.5
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.36.47.69.310.410.711.910.88.98.67.85.6
Precipitation (mm)77606611449131137571303259157
Sunny days10161418151251214172418
Rainy days20121712161826191614613
Snow days100000000000

Great Falls - weather forecast by months

Great Falls weather in januaryGreat Falls weather in februaryGreat Falls weather in marchGreat Falls weather in aprilGreat Falls weather in mayGreat Falls weather in juneGreat Falls weather in julyGreat Falls weather in augustGreat Falls weather in septemberGreat Falls weather in octoberGreat Falls weather in novemberGreat Falls weather in december

Best time to visit Great Falls:

The best time to visit Great Falls during the most sunny months:

  • July — 11.9(h)
  • August — 10.8(h)

The largest precipitation sum in Great Falls is at

  • April — 114(mm)
  • June — 131(mm)
  • July — 137(mm)
  • September — 130(mm)
  • December — 157(mm)

    • Weather forecast in the closest to Great Falls admin centers

    Weather forecast in the closest towns to Great Falls

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    Frequently asked questions

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