Irwin, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a city in Bonneville County, Idaho.
Overnight
42°F
Patchy Smoke
Patchy smoke. Mostly clear. Low around 42, with temperatures rising to around 45 overnight. Southeast wind around 8 mph.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Patchy Smoke | 8 mph SE | 0% |
| Tuesday | 82°F | Patchy Smoke | 5 to 9 mph S | 0% |
| Tuesday Night | 45°F | Patchy Smoke | 3 to 9 mph SE | 0% |
| Wednesday | 85°F | Patchy Smoke | 9 mph SSW | 0% |
| Wednesday Night | 47°F | Mostly Clear | 3 to 12 mph SSE | 0% |
| Thursday | 91°F | Sunny | 6 to 10 mph SSW | 0% |
| Thursday Night | 53°F | Clear | 6 to 14 mph SSE | 0% |
| Friday | 94°F | Sunny | 6 to 14 mph SSW | 0% |
| Friday Night | 57°F | Mostly Clear | 10 mph SSW | 0% |
| Saturday | 95°F | Sunny | 7 to 12 mph SSW | 0% |
| Saturday Night | 59°F | Mostly Clear | 6 to 9 mph S | 0% |
| Sunday | 94°F | Sunny | 7 to 12 mph SSW | 1% |
| Sunday Night | 58°F | Mostly Clear | 8 to 12 mph SSW | 1% |
| Monday | 92°F | Sunny | 10 mph SW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Irwin (43.403, -111.280). Updated through the day.
Growing snapshot for Irwin
Growing season
69 days
Hardiness zone
6a
More local growing data for Irwin: nearby ZIP 83449 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Swan Valley, Id (4 mi from Irwin). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.