Irwin, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Barton County, Missouri.
Overnight
68°F
Mostly Clear
Mostly clear. Low around 68, with temperatures rising to around 70 overnight. South wind around 8 mph.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Mostly Clear | 8 mph S | 0% |
| Tuesday | 94°F | Sunny | 5 to 8 mph S | 0% |
| Tuesday Night | 74°F | Partly Cloudy | 3 to 8 mph SE | 3% |
| Wednesday | 95°F | Partly Sunny then Chance Showers And Thunderstorms | 7 to 10 mph S | 27% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 7 mph SE | 41% |
| Thursday | 92°F | Chance Showers And Thunderstorms | 6 mph S | 41% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 5 mph S | 56% |
| Friday | 90°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 to 7 mph S | 56% |
| Friday Night | 71°F | Slight Chance Showers And Thunderstorms | 7 mph S | 22% |
| Saturday | 92°F | Slight Chance Showers And Thunderstorms then Sunny | 9 mph S | 18% |
| Saturday Night | 73°F | Mostly Clear | 7 to 10 mph S | 5% |
| Sunday | 93°F | Sunny | 10 to 14 mph SW | 3% |
| Sunday Night | 74°F | Mostly Clear | 12 mph S | 2% |
| Monday | 94°F | Sunny | 14 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Irwin (37.589, -94.287). Updated through the day.
Growing snapshot for Irwin
Last spring frost
Apr 9
First fall frost
Oct 27
Growing season
199 days
Hardiness zone
7a
More local growing data for Irwin: nearby ZIP 64759 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lamar 7N, Mo (5.4 mi from Irwin). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.