Altamont, IL Weather & Growing Conditions
Tonight
55°F
Rain
Rain before 4am, then a slight chance of rain showers between 4am and 5am. Mostly cloudy, with a low around 55. South wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Rain | 14 mph S | 95% |
| Wednesday | 63°F | Slight Chance Rain Showers then Mostly Cloudy | 8 to 13 mph SW | 16% |
| Wednesday Night | 43°F | Mostly 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 | Mostly Cloudy | 3 to 9 mph NNW | 8% |
| Friday Night | 37°F | Partly Cloudy | 2 to 6 mph NNW | 1% |
| 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% |
| Tuesday | 66°F | Sunny | 6 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Altamont, IL
Last spring frost
Apr 13
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
6b
Explore more for Altamont, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Effingham 3Sw, Il (6.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.