Waterloo Weather Forecast

    • 63
    • 69

    Rain Showers

    • 53
    • 76

    Rain Showers

    • 60
    • 72

    Rain Showers Likely

    • 59
    • 77

    Chance Rain Showers

    • 63
    • 76

    Rain Showers Likely

    • 60
    • 78

    Rain Showers Likely

    • 56
    • 73

    Chance Rain Showers

Today 14 Sep Jefferson

Mostly cloudy with a 50 percent chance of light Showers. Southeast Winds 10 to 15 Mph.

Tonight 14 Sep Jefferson

Warmer, cloudy. Scattered Showers and isolated Thunderstorms through around Midnight, then Showers and scattered Thunderstorms after midnight. Near steady temperature in the lower 60s. South Winds 15 to 20 Mph. Chance of precipitation 90 percent.

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Waterloo Temperature Statistics

September Temperature

Watertown (13 miles)

  • Lowest 11 September, 2026

    53.8 °F

  • Average September

    70.8 °F

  • Highest 1 September, 2026

    87.3 °F

Climate (2021–2026)

Watertown (13 miles)

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  • Average Low 2021–2026

    35.3 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    53.9 °F
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