Firth, ID Weather & Growing Conditions
Today
52°F
Chance Light Rain then Slight Chance Showers And Thunderstorms
A chance of rain before noon, then a slight 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. Partly sunny, with a high near 52. West wind around 8 mph. Chance of precipitation is 60%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Chance Light Rain then Slight Chance Showers And Thunderstorms | 8 mph W | 55% |
| Tonight | 37°F | Partly Cloudy | 7 mph NW | 12% |
| Sunday | 57°F | Mostly Sunny | 8 mph W | 1% |
| Sunday Night | 39°F | Mostly Clear | 9 mph ENE | 0% |
| Monday | 64°F | Sunny | 5 to 10 mph SSE | 0% |
| Monday Night | 43°F | Partly Cloudy | 7 to 10 mph ENE | 0% |
| Tuesday | 65°F | Mostly Sunny | 6 to 12 mph S | 1% |
| Tuesday Night | 45°F | Partly Cloudy then Slight Chance Light Rain | 6 to 10 mph SE | 16% |
| Wednesday | 65°F | Mostly Sunny | 8 to 12 mph SSW | 10% |
| Wednesday Night | 44°F | Mostly Clear | 7 to 12 mph SSE | 4% |
| Thursday | 68°F | Sunny | 9 to 13 mph SSE | 2% |
| Thursday Night | 46°F | Partly Cloudy | 7 to 13 mph SE | 3% |
| Friday | 68°F | Mostly Sunny | 15 mph SSE | 3% |
| Friday Night | 47°F | Partly Cloudy | 10 to 15 mph S | 9% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Firth, ID
Last spring frost
Jun 9
First fall frost
Sep 11
Growing season
93 days
Hardiness zone
5b
Explore more for Firth, ID: full frost dates · planting calendar · Idaho frost dates
Climate data from the nearest NOAA station, Idaho Falls 16 Se, Id (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.