Monticello, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monticello, a city in Jones County, Iowa.
This Afternoon
76°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 76. South wind 5 to 10 mph. Chance of precipitation is 70%.
7-day forecast for Monticello
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Showers And Thunderstorms Likely | 5 to 10 mph S | 70% |
| Tonight | 60°F | Showers And Thunderstorms | 0 to 10 mph NE | 75% |
| Sunday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 49% |
| Sunday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Monday | 62°F | Rain Showers Likely | 10 to 15 mph NE | 65% |
| Monday Night | 49°F | Rain Showers Likely | 10 mph NE | 65% |
| Tuesday | 61°F | Chance Rain Showers | 10 mph NE | 46% |
| 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) for Monticello (42.230, -91.186). Updated through the day.
Growing snapshot for Monticello
Last spring frost
May 1
First fall frost
Oct 4
Growing season
154 days
Hardiness zone
5a
More local growing data for Monticello: nearby ZIP 52310 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Anamosa 1 Wnw, Ia (9 mi from Monticello). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.