Waterloo Weather Forecast

    • 40
    • 67

    Mostly Sunny

    • 44
    • 69

    Mostly Sunny

    • 45
    • 69

    Mostly Sunny

    • 49
    • 68

    Partly Sunny

    • 52
    • 68

    Mostly Cloudy

    • 46
    • 68

    Partly Sunny

Today 20 Oct Jefferson

Partly sunny in the morning then clearing. Areas of fog in the morning. Highs in the upper 60s. Southeast Winds up to 5 Mph.

Tonight 20 Oct Jefferson

Mostly clear. Patchy fog after midnight. Lows around 40. Southeast Winds up to 5 Mph.

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Waterloo Temperature Statistics

October Temperature

Watertown (13 miles)

  • Lowest 17 October, 2026

    31.8 °F

  • Average October

    58.5 °F

  • Highest 12 October, 2026

    86.5 °F

Climate (2021–2026)

Watertown (13 miles)

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  • Average Low 2021–2026

    35.2 °F

  • Average 2021–2026

    44.8 °F

  • Average High 2021–2026

    53.8 °F
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