Altona, IL Weather & Growing Conditions
Tonight
52°F
Chance Light Rain
A chance of rain before 4am, then a slight chance of rain showers. Mostly cloudy, with a low around 52. South southwest wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Chance Light Rain | 10 to 15 mph SSW | 50% |
| Wednesday | 57°F | Chance Rain Showers then Mostly Cloudy | 17 mph SW | 26% |
| Wednesday Night | 45°F | Mostly Cloudy | 14 mph SW | 12% |
| Thursday | 56°F | Chance Light Rain | 9 to 15 mph WSW | 27% |
| Thursday Night | 42°F | Chance Light Rain | 5 to 9 mph NW | 31% |
| Friday | 53°F | Slight Chance Light Rain then Partly Sunny | 7 to 13 mph N | 15% |
| Friday Night | 34°F | Partly Cloudy | 1 to 6 mph NNW | 1% |
| Saturday | 52°F | Mostly Sunny | 1 to 6 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 1 to 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 to 9 mph W | 12% |
| Sunday Night | 35°F | Mostly Clear | 6 mph W | 2% |
| Monday | 63°F | Sunny | 3 to 13 mph SW | 1% |
| Monday Night | 40°F | Mostly Clear | 5 to 8 mph W | 0% |
| Tuesday | 64°F | Sunny | 7 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Altona, IL
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
165 days
Hardiness zone
5b
Explore more for Altona, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Altona, Il (0.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.