Monticello, IA Weather & Growing Conditions
This Afternoon
52°F
Slight Chance Drizzle
A slight chance of drizzle. Cloudy, with a high near 52. Southwest wind 10 to 15 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 52°F | Slight Chance Drizzle | 10 to 15 mph SW | 14% |
| Tonight | 46°F | Slight Chance Rain Showers | 10 mph W | 24% |
| Thursday | 51°F | Chance Rain Showers | 10 mph NW | 33% |
| Thursday Night | 36°F | Mostly Cloudy | 5 to 10 mph N | 11% |
| Friday | 48°F | Mostly Sunny | 5 to 10 mph N | 0% |
| Friday Night | 27°F | Mostly Clear | 0 mph | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 mph | 0% |
| Sunday | 58°F | Sunny | 0 to 5 mph W | 1% |
| Sunday Night | 34°F | Clear | 0 mph | 0% |
| Monday | 63°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 39°F | Clear | 0 to 5 mph W | 0% |
| Tuesday | 61°F | Sunny | 0 to 5 mph NW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 0 mph | 2% |
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 Nov 5, 2026.