Irwin, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Irwin, a city in Bonneville County, Idaho.
Today
64°F
Chance Showers And Thunderstorms
Rain likely before 9am, then a chance of showers and thunderstorms between 9am and noon, then a chance of showers and thunderstorms between noon and 1pm, then showers and thunderstorms likely between 1pm and 3pm, then a chance of showers and thunderstorms between 3pm and 4pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 64. North wind 0 to 3 mph. Chance of precipitation is 70%.
7-day forecast for Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Chance Showers And Thunderstorms | 0 to 3 mph N | 65% |
| Tonight | 39°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 3 mph N | 22% |
| Sunday | 67°F | Partly Sunny | 0 to 5 mph WSW | 5% |
| Sunday Night | 39°F | Mostly Clear | 6 mph ENE | 0% |
| Monday | 75°F | Sunny | 2 to 10 mph SSE | 0% |
| Monday Night | 43°F | Mostly Clear | 3 to 8 mph E | 0% |
| Tuesday | 77°F | Mostly Sunny | 3 to 13 mph SSE | 1% |
| Tuesday Night | 46°F | Partly Cloudy then Slight Chance Light Rain | 2 to 8 mph SE | 17% |
| Wednesday | 77°F | Slight Chance Light Rain then Mostly Sunny | 3 to 10 mph S | 16% |
| Wednesday Night | 45°F | Mostly Clear | 2 to 10 mph SSE | 6% |
| Thursday | 80°F | Sunny | 3 to 13 mph SSE | 3% |
| Thursday Night | 46°F | Partly Cloudy | 2 to 13 mph SSE | 1% |
| Friday | 79°F | Mostly Sunny | 6 to 17 mph SSE | 5% |
| Friday Night | 47°F | Partly Cloudy | 3 to 13 mph S | 11% |
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 Sep 19, 2026.