Dexter, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dexter, a city in Madison County, Iowa.
Overnight
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Dexter
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Chance Showers And Thunderstorms | 7 mph SW | 43% |
| Saturday | 81°F | Chance Showers And Thunderstorms | 8 mph W | 44% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms | 7 to 10 mph N | 35% |
| Sunday | 66°F | Showers And Thunderstorms Likely | 12 mph NNE | 56% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 12 mph NE | 55% |
| Monday | 61°F | Rain Showers Likely | 12 mph NE | 68% |
| Monday Night | 52°F | Chance Rain Showers | 7 to 10 mph NE | 54% |
| Tuesday | 60°F | Partly Sunny | 8 mph ENE | 14% |
| Tuesday Night | 46°F | Partly Cloudy | 3 to 7 mph ENE | 3% |
| Wednesday | 64°F | Sunny | 5 mph E | 4% |
| Wednesday Night | 51°F | Partly Cloudy | 3 mph ESE | 7% |
| Thursday | 66°F | Slight Chance Rain Showers | 5 mph SE | 22% |
| Thursday Night | 55°F | Mostly Cloudy | 5 mph ESE | 15% |
| Friday | 68°F | Partly Sunny | 6 mph ESE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Dexter (41.515, -94.228). Updated through the day.
Growing snapshot for Dexter
Last spring frost
Apr 30
First fall frost
Oct 3
Growing season
157 days
Hardiness zone
5b
More local growing data for Dexter: nearby ZIP 50070 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Winterset 1S, Ia (14.3 mi from Dexter). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.