Firth Weather Forecast

    • 56
    • 82

    Isolated Thunderstorms

    • 54
    • 84

    Becoming Sunny

    • 55
    • 86

    Mostly Sunny

    • 55
    • 87

    Mostly Sunny

    • 53
    • 87

    Partly Sunny

    • 54
    • 87

    Mostly Sunny

    • 55
    • 90

    Mostly Sunny

Today 22 Jul Lower Snake River Plain

Sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs 76 to 85. Southwest Winds 10 to 20 Mph.

Tonight 22 Jul Lower Snake River Plain

Partly cloudy. Isolated Showers and Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds in the evening. Lows 52 to 59. West Winds 10 to 15 Mph. Shifting to southwest after midnight.

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Firth Temperature Statistics

July Temperature

Idaho Falls Regional Airport (15.5 miles)

  • Lowest 17 July, 2025

    44.7 °F

  • Average July

    70.4 °F

  • Highest 1 July, 2025

    97.6 °F

Climate (2020–Present)

Idaho Falls Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    46 °F

  • Average High 2020–2025

    58.9 °F
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