Monticello, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monticello, a city in Jones County, Iowa.
Today
82°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny. High near 82, with temperatures falling to around 80 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Monticello
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 36% |
| Tonight | 63°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 83% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 66% |
| Wednesday Night | 57°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 37% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 mph | 23% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 2% |
| Friday | 82°F | Sunny | 0 to 5 mph S | 4% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Mostly Sunny | 5 to 10 mph S | 10% |
| Saturday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 24% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 10 mph S | 24% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 42% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 42% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 10 mph E | 39% |
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 Aug 4, 2026.