Altona, IL Weather & Growing Conditions
This Afternoon
82°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South southeast wind around 10 mph, with gusts as high as 17 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 |
|---|---|---|---|---|
| This Afternoon | 82°F | Slight Chance Showers And Thunderstorms | 10 mph SSE | 21% |
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph ESE | 71% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 5 to 14 mph NNE | 70% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 14 mph NE | 51% |
| Monday | 63°F | Rain Showers Likely | 13 to 16 mph ENE | 70% |
| Monday Night | 54°F | Rain Showers Likely | 12 to 15 mph ENE | 65% |
| Tuesday | 62°F | Rain Showers Likely | 14 mph NE | 56% |
| Tuesday Night | 50°F | Mostly Cloudy | 6 to 14 mph NNE | 8% |
| Wednesday | 64°F | Partly Sunny | 10 mph NNE | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph NNE | 1% |
| Thursday | 68°F | Partly Sunny | 3 to 7 mph NE | 3% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 1 to 5 mph NE | 15% |
| Friday | 72°F | Partly Sunny | 2 to 7 mph NE | 11% |
| Friday Night | 55°F | Partly Cloudy | 5 mph ENE | 6% |
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.