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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

WhenTempForecastWindPrecip
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

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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.