Altamont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altamont, a city in Effingham County, Illinois.
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. East southeast wind around 7 mph.
7-day forecast for Altamont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 7 mph ESE | 11% |
| Saturday | 94°F | Mostly Sunny | 5 to 9 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Cloudy | 3 to 7 mph SSW | 7% |
| Sunday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 7 mph WNW | 23% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 7 mph NNE | 45% |
| Monday | 78°F | Rain Showers Likely | 7 to 10 mph NE | 59% |
| Monday Night | 57°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 7 to 12 mph NE | 56% |
| Tuesday | 72°F | Chance Showers And Thunderstorms then Partly Sunny | 12 mph NNE | 35% |
| Tuesday Night | 53°F | Mostly Cloudy | 5 to 12 mph NNE | 6% |
| Wednesday | 73°F | Partly Sunny | 6 to 9 mph NNE | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 9 mph NNE | 3% |
| Thursday | 74°F | Mostly Sunny | 3 to 8 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 7 mph NNE | 3% |
| Friday | 75°F | Mostly Sunny | 3 to 8 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Altamont (39.056, -88.747). Updated through the day.
Growing snapshot for Altamont
Last spring frost
Apr 13
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
6b
More local growing data for Altamont: nearby ZIP 62411 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Effingham 3Sw, Il (6.7 mi from Altamont). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.