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Monticello, IA Weather & Growing Conditions

This Afternoon
76°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Partly sunny. High near 76, with temperatures falling to around 73 in the afternoon. South wind around 5 mph. Chance of precipitation is 70%.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 76°F Showers And Thunderstorms Likely 5 mph S 70%
Tonight 61°F Showers And Thunderstorms Likely 0 to 10 mph NE 72%
Sunday 66°F Chance Rain Showers 10 to 15 mph NE 49%
Sunday Night 54°F Chance Rain Showers 10 to 15 mph NE 40%
Monday 62°F Rain Showers Likely 10 to 15 mph NE 66%
Monday Night 50°F Rain Showers Likely 5 to 10 mph NE 66%
Tuesday 61°F Chance Rain Showers 10 mph NE 45%
Tuesday Night 47°F Partly Cloudy 5 to 10 mph NE 7%
Wednesday 64°F Mostly Sunny 5 to 10 mph NE 2%
Wednesday Night 50°F Partly Cloudy 0 to 5 mph NE 2%
Thursday 66°F Partly Sunny 0 to 5 mph E 10%
Thursday Night 53°F Slight Chance Rain Showers 0 mph 17%
Friday 69°F Slight Chance Rain Showers then Partly Sunny 0 to 5 mph NE 15%
Friday Night 54°F Mostly Cloudy 0 mph 9%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Monticello, IA

Last spring frost
May 1
First fall frost
Oct 4
Growing season
154 days
Hardiness zone
5a

Explore more for Monticello, IA: full frost dates · planting calendar · Iowa frost dates

Climate data from the nearest NOAA station, Anamosa 1 Wnw, Ia (9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.