Arco, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arco, a city in Butte County, Idaho.
This Afternoon
62°F
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms before 4pm, then isolated showers and thunderstorms. Partly sunny, with a high near 62. South southwest wind around 5 mph. Chance of precipitation is 30%.
7-day forecast for Arco
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Scattered Showers And Thunderstorms | 5 mph SSW | 31% |
| Tonight | 38°F | Partly Cloudy | 3 mph NNW | 7% |
| Sunday | 69°F | Sunny | 5 mph E | 2% |
| Sunday Night | 41°F | Mostly Clear | 5 mph ENE | 0% |
| Monday | 75°F | Sunny | 6 mph ENE | 0% |
| Monday Night | 44°F | Mostly Clear | 2 to 6 mph NE | 0% |
| Tuesday | 76°F | Mostly Sunny | 6 mph ENE | 0% |
| Tuesday Night | 46°F | Partly Cloudy | 2 to 6 mph W | 7% |
| Wednesday | 77°F | Sunny | 2 to 9 mph WNW | 4% |
| Wednesday Night | 45°F | Mostly Clear | 1 to 9 mph W | 4% |
| Thursday | 79°F | Sunny | 2 to 8 mph E | 1% |
| Thursday Night | 47°F | Partly Cloudy | 2 to 9 mph NNW | 2% |
| Friday | 79°F | Mostly Sunny | 3 to 10 mph E | 2% |
| Friday Night | 46°F | Partly Cloudy | 3 to 13 mph WSW | 7% |
Forecast source: National Weather Service (api.weather.gov) for Arco (43.632, -113.301). Updated through the day.
Growing snapshot for Arco
Last spring frost
May 22
First fall frost
Sep 22
Growing season
119 days
Hardiness zone
5a
More local growing data for Arco: nearby ZIP 83255 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Arco, Id (9.6 mi from Arco). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.