Irwin, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a community in Barton County, Missouri.
This Afternoon
69°F
Chance Drizzle
A chance of drizzle after 4pm. Mostly cloudy. High near 69, with temperatures falling to around 62 in the afternoon. Southwest wind 13 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Chance Drizzle | 13 to 17 mph SW | 25% |
| Tonight | 48°F | Patchy Drizzle | 8 to 12 mph W | 20% |
| Wednesday | 61°F | Mostly Sunny | 7 to 12 mph W | 5% |
| 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% |
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 3, 2026.