Monticello, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monticello, a city in Jones County, Iowa.
Overnight
65°F
Patchy Fog
Patchy fog and occasional showers and thunderstorms. Cloudy. Low around 65, with temperatures rising to around 67 overnight. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Monticello
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Patchy Fog | 5 mph E | 77% |
| Saturday | 79°F | Patchy Fog | 5 to 10 mph S | 93% |
| Saturday Night | 60°F | Showers And Thunderstorms Likely | 5 to 10 mph NW | 71% |
| Sunday | 67°F | Chance Rain Showers | 10 to 15 mph NE | 49% |
| Sunday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Monday | 63°F | Chance Rain Showers | 15 mph NE | 41% |
| Monday Night | 48°F | Chance Rain Showers | 10 mph NE | 40% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 40% |
| Tuesday Night | 45°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 66°F | Mostly Sunny | 0 to 5 mph NE | 7% |
| Thursday Night | 51°F | Partly Cloudy | 0 mph | 5% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph E | 5% |
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.