Irwin, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Barton County, Missouri.
This Afternoon
97°F
Sunny
Sunny. High near 97, with temperatures falling to around 95 in the afternoon. Heat index values as high as 100. Southwest wind around 8 mph.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 97°F | Sunny | 8 mph SW | 9% |
| Tonight | 73°F | Mostly Clear | 5 to 8 mph S | 10% |
| Saturday | 97°F | Sunny | 9 to 14 mph SW | 2% |
| Saturday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 9 mph SW | 35% |
| Sunday | 90°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 54% |
| Sunday Night | 64°F | Showers And Thunderstorms Likely | 5 mph NE | 73% |
| Monday | 80°F | Showers And Thunderstorms Likely | 3 to 9 mph N | 72% |
| Monday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 6 to 9 mph N | 15% |
| Tuesday | 74°F | Partly Sunny | 9 mph N | 7% |
| Tuesday Night | 53°F | Partly Cloudy | 5 to 8 mph NE | 1% |
| Wednesday | 76°F | Mostly Sunny | 7 mph NE | 2% |
| Wednesday Night | 55°F | Mostly Clear | 6 mph NE | 3% |
| Thursday | 79°F | Mostly Sunny | 5 mph E | 8% |
| Thursday Night | 58°F | Partly Cloudy | 5 mph E | 7% |
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 Sep 19, 2026.