Altamont, IL Weather & Growing Conditions
Overnight
57°F
Slight Chance Light Rain
A slight chance of rain. Mostly cloudy, with a low around 57. South southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Slight Chance Light Rain | 10 mph SSW | 24% |
| Wednesday | 63°F | Slight Chance Light Rain then Slight Chance Drizzle | 9 to 13 mph SW | 22% |
| Wednesday Night | 44°F | Slight Chance Drizzle then Partly Cloudy | 8 mph WSW | 10% |
| Thursday | 64°F | Mostly Sunny | 8 to 13 mph WSW | 1% |
| Thursday Night | 44°F | Mostly Cloudy | 3 mph WNW | 1% |
| Friday | 55°F | Partly Sunny | 5 to 10 mph NNW | 2% |
| Friday Night | 34°F | Partly Cloudy | 2 to 7 mph NNW | 0% |
| Saturday | 54°F | Mostly Sunny | 5 mph NNW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 59°F | Sunny | 1 to 6 mph WNW | 1% |
| Sunday Night | 33°F | Clear | 2 mph WNW | 1% |
| Monday | 63°F | Sunny | 0 to 6 mph WSW | 0% |
| Monday Night | 38°F | Clear | 2 mph SW | 0% |
| Tuesday | 66°F | Sunny | 5 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.