Monticello Weather Forecast
- 59
- 80
Partly Sunny
- 61
- 88
Mostly Sunny
- 64
- 91
Mostly Sunny
- 67
- 94
Partly Sunny
- 68
- 96
Partly Sunny
- 66
- 95
Slight Chance Rain Showers
Today 9 Sep Lewis
Partly sunny. Highs around 80. South Winds 5 to 10 Mph.
Tonight 9 Sep Lewis
Partly cloudy. Lows in the upper 50s. Southeast Winds 5 to 10 Mph.
Monticello Temperature Statistics
September Temperature
Keokuk Municipal Airport (28 miles)
Lowest 6 September, 2025
44.6 °FAverage September
62.5 °FHighest 1 September, 2025
78.8 °F
Climate (2020–Present)
Keokuk Municipal Airport (28 miles)
Average Low 2020–2025
43.3 °FAverage 2020–2025
52.9 °FAverage High 2020–2025
62.3 °F