Sunbeam Weather Forecast

    • 75
    • 89

    Chance Thunderstorms

    • 76
    • 92

    Mostly Sunny

    • 75
    • 93

    Sunny

    • 75
    • 94

    Mostly Sunny

    • 74
    • 93

    Slight Chance Thunderstorms

    • 73
    • 92

    Slight Chance Thunderstorms

Today 28 Jun Mercer

Partly sunny. A slight chance of Showers and Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. Southeast Winds 10 to 15 Mph. Gusts up to 30 Mph this afternoon. Chance of rain 30 percent. Heat index Values up to 100 this afternoon.

Tonight 28 Jun Mercer

Mostly clear. Humid with Lows in the mid 70s. South Winds 10 to 15 Mph. Heat index Values up to 101 early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sunbeam Temperature Statistics

June Temperature

Galesburg Municipal Airport (20.5 miles)

  • Lowest 2 June, 2026

    46.4 °F

  • Average June

    69.3 °F

  • Highest 6 June, 2026

    90.3 °F

Climate (2021–2026)

Galesburg Municipal Airport (20.5 miles)

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  • Average Low 2021–2026

    41.6 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    62.4 °F
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