Altamont, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altamont, a city in Effingham County, Illinois.
This Afternoon
75°F
Slight Chance T-storms
A slight chance of thunderstorms and a slight chance of rain before 4pm, then a chance of rain and a slight chance of thunderstorms. Partly sunny, with a high near 75. South southeast wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Altamont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Slight Chance T-storms | 18 mph SSE | 39% |
| Tonight | 55°F | Rain | 12 to 16 mph S | 81% |
| Wednesday | 63°F | Slight Chance Light Rain then Mostly Cloudy | 8 to 13 mph SW | 21% |
| Wednesday Night | 43°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 64°F | Sunny | 5 to 12 mph WSW | 0% |
| Thursday Night | 43°F | Mostly Cloudy | 2 mph WNW | 3% |
| Friday | 57°F | Partly Sunny | 3 to 9 mph NNW | 8% |
| Friday Night | 37°F | Partly Cloudy | 2 to 6 mph NNW | 2% |
| Saturday | 55°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 1 mph WNW | 1% |
| Sunday | 60°F | Sunny | 1 to 7 mph W | 7% |
| Sunday Night | 34°F | Mostly Clear | 3 mph WNW | 5% |
| Monday | 63°F | Sunny | 2 to 8 mph WSW | 3% |
| Monday Night | 38°F | Mostly Clear | 3 mph SW | 1% |
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 Nov 4, 2026.