Grantham Weather Forecast

    • -7
    • 21

    Slight Chance Snow Showers

    • -4
    • 4

    Cold

    • 7
    • 11

    Snow

    • -1
    • 16

    Snow Likely

    • 0
    • 16

    Partly Sunny

    • -2
    • 18

    Partly Sunny

Today 23 Jan Sullivan

Partly sunny. A chance of snow Showers this afternoon. Highs in the lower 20s. West Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of snow 40 percent. Wind chill Values as low as 6 below this afternoon.

Tonight 23 Jan Sullivan

Partly cloudy with a slight chance of snow Showers in the Evening, then mostly clear after midnight. Colder with Lows around 6 below. Northwest Winds 15 to 20 Mph with Gusts up to 40 Mph. Chance of snow 20 percent. Wind chill Values as low as 24 below.

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Grantham Temperature Statistics

January Temperature

Lebanon Municipal Airport (12.4 miles)

  • Lowest 2 January, 2026

    1.9 °F

  • Average January

    26.7 °F

  • Highest 9 January, 2026

    48 °F

Climate (2021–Present)

Lebanon Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    38.1 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    59.8 °F
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