Altona, IL Weather & Growing Conditions
Tonight
67°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1am, then patchy fog and showers and thunderstorms likely. Mostly cloudy, with a low around 67. East southeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 67°F | Showers And Thunderstorms Likely | 5 mph ESE | 71% |
| Sunday | 72°F | Patchy Fog then Showers And Thunderstorms Likely | 6 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% |
| Saturday | 73°F | Mostly Sunny | 2 to 6 mph ENE | 5% |
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 20, 2026.