Altona, IL Weather & Growing Conditions
Overnight
68°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 68. Southeast wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Slight Chance Showers And Thunderstorms | 8 mph SE | 19% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 9 mph SE | 50% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely | 6 mph SW | 88% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 6 to 16 mph NNE | 72% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 14 to 17 mph NE | 54% |
| Monday | 64°F | Showers And Thunderstorms Likely | 17 mph ENE | 65% |
| Monday Night | 52°F | Chance Rain Showers | 13 to 16 mph NE | 50% |
| Tuesday | 62°F | Chance Rain Showers | 16 mph NE | 28% |
| Tuesday Night | 49°F | Partly Cloudy | 7 to 13 mph NNE | 9% |
| Wednesday | 66°F | Mostly Sunny | 8 to 12 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 5 to 8 mph NNE | 6% |
| Thursday Night | 53°F | Partly Cloudy | 2 to 6 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 2 to 8 mph NE | 3% |
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 Sep 19, 2026.