Grantham Weather Forecast

    • 29
    • 31

    Wintry Mix

    • 33
    • 34

    Freezing Rain Likely

    • 31
    • 58

    Rain Likely

    • 18
    • 37

    Partly Sunny

    • 29
    • 44

    Snow Likely

    • 44
    • 53

    Chance Rain

Today 29 Mar Sullivan

Freezing rain. Sleet and rain. Sleet accumulation up to 1 inch. Ice accumulation of up to three Tenths of an inch. Highs in the lower 30s. East Winds around 10 Mph with Gusts up to 20 Mph this Morning, becoming light and variable. Chance of precipitation near 100 percent.

Tonight 29 Mar Sullivan

Freezing rain and rain. Ice accumulation of up to four Tenths of an inch. Lows around 30. Light and variable Winds. Chance of precipitation 90 percent.

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  • Temperature Real-Time

Grantham Temperature Statistics

March Temperature

Lebanon Municipal Airport (12.4 miles)

  • Lowest 3 March, 2025

    -5.2 °F

  • Average March

    36.5 °F

  • Highest 19 March, 2025

    67.6 °F

Climate (2020–Present)

Lebanon Municipal Airport (12.4 miles)

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  • Average Low 2020–2025

    38.1 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    59.7 °F
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