Gibson Reservoir Weather Forecast

    • 28
    • 50

    Chance Rain/Snow

    • 35
    • 58

    Partly Sunny

    • 34
    • 51

    Rain Likely

    • 35
    • 60

    Partly Sunny

    • 39
    • 64

    Chance Rain

    • 43
    • 71

    Partly Sunny

    • 45
    • 72

    Mostly Sunny

Today 18 May Southern Rocky Mountain Front

Not as cool. Partly sunny. Chance of snow Showers early in the Afternoon, then chance of snow Showers, rain Showers and slight chance of Thunderstorms late in the afternoon. Near steady temperature in the lower 40s. Northwest Winds up to 10 Mph. Chance of precipitation 50 percent.

Tonight 18 May Southern Rocky Mountain Front

Partly cloudy. A 20 percent chance of snow Showers in the evening. Lows 22 to 28. West Winds up to 10 Mph. Gusts up to 25 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Gibson Reservoir Temperature Statistics

May Temperature

Great Falls, Great Falls International Airport (66.5 miles)

  • Lowest 6 May, 2026

    23.6 °F

  • Average May

    54.5 °F

  • Highest 13 May, 2026

    89.7 °F

Climate (2021–Present)

Great Falls, Great Falls International Airport (66.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    34.4 °F

  • Average 2021–2026

    47 °F

  • Average High 2021–2026

    59.2 °F
Get WillyWeather+ to remove ads