Arco, ID Weather & Growing Conditions
Tonight
31°F
Cloudy
Cloudy. Low around 31, with temperatures rising to around 34 overnight. North wind 8 to 12 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Cloudy | 8 to 12 mph N | 2% |
| Wednesday | 50°F | Partly Sunny | 3 to 12 mph W | 1% |
| Wednesday Night | 28°F | Areas Of Fog | 5 to 9 mph W | 0% |
| Thursday | 45°F | Areas Of Fog then Partly Sunny | 5 to 12 mph SSW | 0% |
| Thursday Night | 27°F | Areas Of Fog | 3 to 12 mph W | 0% |
| Friday | 45°F | Mostly Sunny | 3 to 8 mph WSW | 0% |
| Friday Night | 27°F | Partly Cloudy | 3 to 7 mph NNW | 0% |
| Saturday | 47°F | Mostly Sunny | 8 mph ENE | 0% |
| Saturday Night | 29°F | Partly Cloudy | 7 mph NE | 0% |
| Sunday | 52°F | Mostly Sunny | 7 mph SSE | 0% |
| Sunday Night | 32°F | Partly Cloudy | 7 mph WNW | 0% |
| Monday | 52°F | Partly Sunny | 7 mph E | 0% |
| Monday Night | 33°F | Mostly Cloudy | 6 mph W | 2% |
| Tuesday | 53°F | Mostly Sunny | 6 mph WSW | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arco, ID
Last spring frost
May 24
First fall frost
Oct 1
Growing season
130 days
Hardiness zone
5a
Explore more for Arco, ID: full frost dates · planting calendar · Idaho frost dates
Climate data from the nearest NOAA station, Arco 17 Sw, Id (9.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.