Grantham Weather Forecast

    • 62
    • 82

    Slight Chance Rain Showers

    • 63
    • 79

    Rain Showers

    • 59
    • 80

    Partly Sunny

    • 61
    • 82

    Partly Sunny

    • 62
    • 83

    Rain Showers Likely

    • 62
    • 83

    Chance Thunderstorms

Today 21 Jun Cumberland

Mostly sunny. Highs in the lower 80s. West Winds 5 to 10 Mph.

Tonight 21 Jun Cumberland

Mostly cloudy. Lows in the lower 60s. Northwest Winds around 5 Mph in the Evening, becoming light and variable.

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Grantham Temperature Statistics

June Temperature

Harrisburg, Capital City Airport (8.1 miles)

  • Lowest 1 June, 2026

    50 °F

  • Average June

    73.5 °F

  • Highest 11 June, 2026

    91.9 °F

Climate (2021–2026)

Harrisburg, Capital City Airport (8.1 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    56.9 °F

  • Average High 2021–2026

    66.3 °F
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