Altona, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altona, a village in Knox County, Illinois.
Today
83°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm. Mostly cloudy, with a high near 83. Southeast wind around 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Altona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Chance Showers And Thunderstorms | 9 mph SE | 48% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 2 to 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 | 12 to 16 mph NE | 50% |
| Tuesday | 62°F | Chance Rain Showers | 16 mph NE | 30% |
| Tuesday Night | 49°F | Partly Cloudy | 7 to 13 mph NNE | 9% |
| Wednesday | 66°F | Mostly Sunny | 7 to 12 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 7 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 7 mph NNE | 6% |
| Thursday Night | 53°F | Mostly Cloudy | 2 to 6 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 3 to 8 mph NE | 3% |
| Friday Night | 53°F | Partly Cloudy | 2 to 6 mph ENE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Altona (41.115, -90.165). Updated through the day.
Growing snapshot for Altona
Last spring frost
Apr 28
First fall frost
Oct 12
Growing season
165 days
Hardiness zone
5b
More local growing data for Altona: nearby ZIP 61414 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
East Galesburg
Galesburg
Gilson
Henderson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
Rio
St. Augustine
Victoria
Wataga
Williamsfield
Yates City
Climate data from the nearest NOAA station, Altona, Il (0.6 mi from Altona). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.