Monona, IA Weather & Growing Conditions
Today
78°F
Mostly Cloudy then Scattered Showers And Thunderstorms
Scattered rain showers between 1pm and 4pm, then scattered showers and thunderstorms between 4pm and 5pm, then scattered showers and thunderstorms. Mostly cloudy. High near 78, with temperatures falling to around 75 in the afternoon. West wind 5 to 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Mostly Cloudy then Scattered Showers And Thunderstorms | 5 to 8 mph W | 48% |
| Tonight | 60°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 5 mph NW | 64% |
| Wednesday | 75°F | Slight Chance Rain Showers then Partly Sunny | 3 mph NW | 16% |
| Wednesday Night | 54°F | Partly Cloudy | 3 mph NW | 3% |
| Thursday | 79°F | Sunny | 2 mph SE | 2% |
| Thursday Night | 58°F | Mostly Clear | 2 mph S | 0% |
| Friday | 82°F | Sunny | 2 to 7 mph S | 4% |
| Friday Night | 63°F | Mostly Clear | 6 mph S | 11% |
| Saturday | 83°F | Mostly Sunny | 7 mph SW | 9% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 7 mph S | 32% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 9 mph S | 32% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 3 to 7 mph S | 42% |
| Monday | 83°F | Chance Showers And Thunderstorms | 7 mph S | 42% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 7 mph NE | 33% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Monona, IA
Last spring frost
May 1
First fall frost
Oct 3
Growing season
153 days
Hardiness zone
5a
Explore more for Monona, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Postville, Ia (9.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.