Firth Weather Forecast

    • 38
    • 57

    Slight Chance Rain Showers

    • 43
    • 66

    Rain Showers Likely

    • 37
    • 61

    Chance Rain

    • 40
    • 70

    Sunny

    • 45
    • 75

    Mostly Sunny

    • 44
    • 75

    Rain Likely

    • 38
    • 60

    Rain Likely

Today 28 Apr Lower Snake River Plain

Mostly cloudy with a chance of rain Showers. Highs 54 to 61. West Winds around 10 Mph. Shifting to northwest in the afternoon.

Tonight 28 Apr Lower Snake River Plain

Partly cloudy. Lows 34 to 42. Southwest Winds around 10 Mph.

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Firth Temperature Statistics

April Temperature

Idaho Falls Regional Airport (15.5 miles)

  • Lowest 19 April, 2025

    19.9 °F

  • Average April

    46 °F

  • Highest 10 April, 2025

    75.7 °F

Climate (2020–Present)

Idaho Falls Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    32.9 °F

  • Average 2020–2025

    45.9 °F

  • Average High 2020–2025

    58.6 °F
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