Grantham Weather Forecast

    • 33
    • 63

    Mostly Sunny

    • 38
    • 67

    Slight Chance Rain

    • 37
    • 45

    Rain Likely

    • 20
    • 49

    Chance Snow

    • 26
    • 39

    Chance Snow

    • 22
    • 38

    Chance Snow

    • 29
    • 41

    Rain/Snow Likely

Today 9 Mar Sullivan

Partly sunny. Highs in the lower 60s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 9 Mar Sullivan

Mostly clear. Lows in the lower 30s. Southwest Winds around 10 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grantham Temperature Statistics

March Temperature

Lebanon Municipal Airport (12.4 miles)

  • Lowest 2 March, 2026

    -6 °F

  • Average March

    28.2 °F

  • Highest 4 March, 2026

    51.8 °F

Climate (2021–Present)

Lebanon Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    59.8 °F
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