Irondale, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irondale, a city in Washington County, Missouri.
This Afternoon
71°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 71, with temperatures falling to around 65 in the afternoon. South wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.
7-day forecast for Irondale
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Rain | 14 mph S | 84% |
| Tonight | 48°F | Light Rain | 5 to 14 mph SW | 80% |
| Wednesday | 64°F | Mostly Cloudy | 5 to 9 mph W | 1% |
| Wednesday Night | 37°F | Mostly Clear | 5 mph SW | 0% |
| Thursday | 68°F | Sunny | 2 to 7 mph W | 2% |
| Thursday Night | 39°F | Mostly Cloudy | 3 mph NW | 13% |
| Friday | 59°F | Partly Sunny | 2 to 8 mph NW | 3% |
| Friday Night | 35°F | Mostly Cloudy | 0 to 6 mph N | 3% |
| Saturday | 58°F | Partly Sunny | 0 to 3 mph N | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph N | 2% |
| Sunday | 63°F | Sunny | 0 to 6 mph NW | 6% |
| Sunday Night | 32°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 68°F | Sunny | 1 to 6 mph W | 1% |
| Monday Night | 36°F | Mostly Clear | 1 to 5 mph SW | 1% |
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 Nov 4, 2026.