Irondale, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irondale, a city in Washington County, Missouri.
This Afternoon
98°F
Sunny
Sunny, with a high near 98. Southwest wind around 5 mph.
7-day forecast for Irondale
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Sunny | 5 mph SW | 1% |
| Tonight | 71°F | Mostly Clear | 5 mph SW | 1% |
| Sunday | 95°F | Mostly Sunny | 5 mph W | 2% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph NE | 50% |
| Monday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 6 mph NE | 73% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 6 mph N | 73% |
| Tuesday | 74°F | Slight Chance Rain Showers then Partly Sunny | 5 to 8 mph N | 19% |
| Tuesday Night | 53°F | Mostly Cloudy | 2 to 8 mph N | 2% |
| Wednesday | 74°F | Mostly Sunny | 3 to 7 mph N | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 6 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 0 to 6 mph N | 2% |
| Thursday Night | 55°F | Mostly Cloudy | 0 to 5 mph NE | 1% |
| Friday | 79°F | Slight Chance Rain Showers | 0 to 6 mph NE | 16% |
| Friday Night | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph NE | 16% |
Forecast source: National Weather Service (api.weather.gov) for Irondale (37.837, -90.670). Updated through the day.
Growing snapshot for Irondale
Last spring frost
Apr 11
First fall frost
Oct 28
Growing season
198 days
Hardiness zone
6b
More local growing data for Irondale: nearby ZIP 63648 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Potosi 4 Sw, Mo (9.5 mi from Irondale). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.