Dexter, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dexter, a city in Madison County, Iowa.
Today
82°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 82, with temperatures falling to around 79 in the afternoon. Northwest wind 5 to 12 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Dexter
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Chance Showers And Thunderstorms | 5 to 12 mph NW | 32% |
| Tonight | 62°F | Showers And Thunderstorms | 7 to 12 mph N | 89% |
| Wednesday | 72°F | Chance Showers And Thunderstorms | 8 mph NE | 49% |
| Wednesday Night | 57°F | Slight Chance Rain Showers | 2 to 7 mph NE | 21% |
| Thursday | 81°F | Mostly Sunny | 1 to 5 mph ENE | 3% |
| Thursday Night | 61°F | Mostly Clear | 5 mph SSE | 4% |
| Friday | 85°F | Mostly Sunny | 3 to 9 mph S | 4% |
| Friday Night | 67°F | Mostly Clear | 8 mph S | 9% |
| Saturday | 89°F | Sunny | 6 to 12 mph SSW | 7% |
| Saturday Night | 73°F | Mostly Clear | 12 to 16 mph SSW | 10% |
| Sunday | 90°F | Mostly Sunny | 14 mph S | 10% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms | 14 mph SSE | 28% |
| Monday | 90°F | Chance Showers And Thunderstorms then Partly Sunny | 15 mph SSW | 28% |
| Monday Night | 72°F | Chance Showers And Thunderstorms | 16 mph SSE | 26% |
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 Aug 4, 2026.