Fallon Weather Forecast

    • 31
    • 49

    Slight Chance Rain Showers

    • 39
    • 63

    Partly Sunny

    • 42
    • 74

    Slight Chance Thunderstorms

    • 42
    • 70

    Partly Sunny

    • 44
    • 72

    Slight Chance Thunderstorms

    • 48
    • 79

    Partly Sunny

Today 18 May Prairie

Cloudy with a 20 percent chance of Showers. Highs in the upper 40s. Northwest wind 10 to 15 Mph.

Tonight 18 May Prairie

Mostly cloudy. A slight chance of rain Showers in the evening. Lows in the lower 30s. North wind 5 to 10 Mph in the Evening, becoming light and variable. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fallon Temperature Statistics

May Temperature

Glendive, Dawson Community Airport (25.5 miles)

  • Lowest 6 May, 2026

    21.9 °F

  • Average May

    56.5 °F

  • Highest 13 May, 2026

    86 °F

Climate (2021–Present)

Glendive, Dawson Community Airport (25.5 miles)

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  • Average Low 2021–2026

    33.7 °F

  • Average 2021–2026

    45.2 °F

  • Average High 2021–2026

    56.6 °F
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