Altamont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altamont, a city in Effingham County, Illinois.
Today
85°F
Sunny
Sunny, with a high near 85. South southeast wind around 3 mph.
7-day forecast for Altamont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 3 mph SSE | 0% |
| Tonight | 65°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 87°F | Sunny | 1 to 5 mph S | 1% |
| Wednesday Night | 67°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 38% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 6 mph SSW | 65% |
| Thursday Night | 67°F | Chance Showers And Thunderstorms | 3 mph S | 49% |
| Friday | 84°F | Chance Showers And Thunderstorms | 5 mph SW | 35% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 2 mph SSW | 24% |
| Saturday | 86°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 24% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph S | 15% |
| Sunday | 88°F | Sunny | 5 to 9 mph SSW | 8% |
| Sunday Night | 72°F | Mostly Clear | 7 mph SSW | 6% |
| Monday | 89°F | Mostly Sunny | 6 to 9 mph SSW | 9% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 20% |
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 Aug 4, 2026.