Waterloo Weather Forecast

    • 75
    • 93

    Slight Chance Thunderstorms

    • 74
    • 93

    Chance Thunderstorms

    • 71
    • 90

    Rain Showers Likely

    • 68
    • 88

    Rain Showers Likely

    • 65
    • 86

    Chance Thunderstorms

    • 63
    • 85

    Chance Thunderstorms

Today 30 Jun Jefferson

Hot and humid. Mostly sunny. Highs in the lower 90s. Southwest Winds 10 to 15 Mph. Highest heat index Readings 102 to 107 in the late morning and afternoon.

Tonight 30 Jun Jefferson

Partly cloudy. Near steady temperature in the upper 70s. Southwest Winds 5 to 15 Mph.

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Waterloo Temperature Statistics

June Temperature

Watertown (13 miles)

  • Lowest 27 June, 2026

    52.9 °F

  • Average June

    66.1 °F

  • Highest 27 June, 2026

    76.6 °F

Climate (2021–2026)

Watertown (13 miles)

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  • Average Low 2021–2026

    35.1 °F

  • Average 2021–2026

    44.8 °F

  • Average High 2021–2026

    53.8 °F
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