Monticello Weather Forecast

    • 67
    • 82

    Mostly Cloudy

    • 69
    • 82

    Rain Showers

    • 61
    • 76

    Rain Showers Likely

    • 53
    • 68

    Slight Chance Rain Showers

    • 54
    • 68

    Slight Chance Rain Showers

    • 50
    • 69

    Slight Chance Rain Showers

Today 29 Sep Lewis

Mostly sunny. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 29 Sep Lewis

Cloudy. Not as cool with Lows in the upper 60s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Monticello Temperature Statistics

September Temperature

Keokuk Municipal Airport (28 miles)

  • Lowest 23 September, 2026

    51.8 °F

  • Average September

    61.7 °F

  • Highest 24 September, 2026

    69.8 °F

Climate (2021–2026)

Keokuk Municipal Airport (28 miles)

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  • Average Low 2021–2026

    43.8 °F

  • Average 2021–2026

    53.5 °F

  • Average High 2021–2026

    63.1 °F
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