Grafton Weather Forecast

    • 42
    • 51

    Rain Showers

    • 41
    • 52

    Rain Showers Likely

    • 40
    • 62

    Partly Sunny

    • 42
    • 64

    Mostly Cloudy

    • 44
    • 63

    Mostly Cloudy

    • 46
    • 64

    Chance Rain Showers

Today 20 May Worth

A slight chance of Thunderstorms. Showers, breezy with Highs in the lower 50s. East Winds 15 to 25 Mph with Gusts up to 40 Mph. Chance of rain near 100 percent.

Tonight 20 May Worth

Cloudy. Showers Likely, mainly in the evening. Lows in the lower 40s. Northeast Winds 10 to 15 Mph, becoming north after midnight. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grafton Temperature Statistics

May Temperature

Mason City Municipal Airport (17.4 miles)

  • Lowest 3 May, 2025

    36.6 °F

  • Average May

    61.3 °F

  • Highest 12 May, 2025

    86.6 °F

Climate (2020–Present)

Mason City Municipal Airport (17.4 miles)

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  • Average Low 2020–2025

    36.9 °F

  • Average 2020–2025

    47.6 °F

  • Average High 2020–2025

    58.3 °F
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