Firth Weather Forecast

    • 30
    • 55

    Rain Showers

    • 21
    • 41

    Snow Likely

    • 24
    • 45

    Mostly Sunny

    • 30
    • 55

    Mostly Sunny

    • 39
    • 67

    Partly Sunny

    • 42
    • 73

    Mostly Sunny

    • 43
    • 72

    Partly Sunny

Today 15 Apr Lower Snake River Plain

Mostly cloudy. A chance of rain Showers in the afternoon. Windy. Highs 52 to 59. Southwest Winds 10 to 15 Mph increasing to 20 to 30 Mph in the afternoon.

Tonight 15 Apr Lower Snake River Plain

Rain likely and a slight chance of Thunderstorms in the evening. Then a chance of rain and a slight chance of snow after midnight. Breezy, Colder. Little or no snow accumulation. Lows 26 to 33. Southwest Winds 15 to 25 Mph.

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Firth Temperature Statistics

April Temperature

Idaho Falls Regional Airport (15.5 miles)

  • Lowest 5 April, 2026

    25.6 °F

  • Average April

    47.6 °F

  • Highest 10 April, 2026

    76.6 °F

Climate (2021–Present)

Idaho Falls Regional Airport (15.5 miles)

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  • Average Low 2021–2026

    33.9 °F

  • Average 2021–2026

    46.9 °F

  • Average High 2021–2026

    59.9 °F
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