Monticello, IA Weather & Growing Conditions
Tonight
50°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. Low around 50, with temperatures rising to around 53 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 67% |
| Wednesday | 54°F | Chance Rain Showers | 15 mph SW | 47% |
| Wednesday Night | 44°F | Chance Rain Showers | 10 to 15 mph SW | 34% |
| Thursday | 52°F | Rain Showers Likely | 10 mph W | 67% |
| Thursday Night | 40°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph N | 20% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 5% |
| Sunday | 58°F | Sunny | 5 to 10 mph W | 11% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 2% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph NW | 0% |
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 (6.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.