Irwin, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Barton County, Missouri.
Tonight
48°F
Patchy Drizzle
Patchy drizzle. Cloudy, with a low around 48. Wind chill values as low as 46. West wind 8 to 12 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Patchy Drizzle | 8 to 12 mph W | 22% |
| Wednesday | 61°F | Patchy Drizzle then Mostly Sunny | 7 to 12 mph W | 15% |
| Wednesday Night | 41°F | Clear | 5 mph SW | 0% |
| Thursday | 62°F | Mostly Sunny then Chance Rain Showers | 3 to 7 mph W | 37% |
| Thursday Night | 40°F | Mostly Cloudy | 5 mph NW | 9% |
| Friday | 58°F | Mostly Sunny | 7 mph N | 0% |
| Friday Night | 38°F | Partly Cloudy | 2 mph N | 0% |
| Saturday | 59°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 37°F | Mostly Clear | 2 mph W | 4% |
| Sunday | 65°F | Sunny | 2 to 6 mph W | 5% |
| Sunday Night | 38°F | Mostly Clear | 2 to 6 mph SW | 0% |
| Monday | 69°F | Sunny | 6 to 10 mph SW | 0% |
| Monday Night | 43°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 71°F | Sunny | 3 to 7 mph SW | 0% |
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 Nov 4, 2026.