Waltham Weather Forecast

    • 28
    • 42

    Chance Rain

    • 33
    • 38

    Chance Rain/Snow

    • 34
    • 52

    Mostly Cloudy

    • 25
    • 45

    Mostly Cloudy

    • 29
    • 38

    Chance Rain/Freezing Rain

    • 30
    • 46

    Rain Likely

    • 19
    • 38

    Slight Chance Rain

Today 31 Jan La Salle

Rain. Patchy fog. Nearly steady Temperatures in the upper 30s. Northeast Winds 10 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation near 100 percent.

Tonight 31 Jan La Salle

Mostly clear until early Morning, then becoming partly cloudy. Lows in the upper 20s. Northeast Winds 10 to 20 Mph. Gusts up to 30 Mph in the Evening, decreasing to 20 Mph after midnight.

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Waltham Temperature Statistics

January Temperature

Illinois Valley Regional Airport (8.7 miles)

  • Lowest 21 January, 2025

    -9.2 °F

  • Average January

    21.2 °F

  • Highest 28 January, 2025

    50.9 °F

Climate (2020–Present)

Illinois Valley Regional Airport (8.7 miles)

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  • Average Low 2020–2025

    43.1 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    61.7 °F
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