Altona, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altona, a village in Knox County, Illinois.
Overnight
54°F
Slight Chance Light Rain
A slight chance of rain after 5am. Mostly cloudy, with a low around 54. South southwest wind around 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
7-day forecast for Altona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Light Rain | 13 mph SSW | 16% |
| Wednesday | 57°F | Patchy Drizzle | 16 mph WSW | 19% |
| Wednesday Night | 45°F | Patchy Drizzle then Cloudy | 15 mph WSW | 10% |
| Thursday | 54°F | Chance Light Rain | 12 to 15 mph W | 29% |
| Thursday Night | 41°F | Chance Light Rain then Mostly Cloudy | 10 mph NNW | 26% |
| Friday | 51°F | Partly Sunny | 7 to 13 mph N | 9% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Saturday | 52°F | Sunny | 0 to 6 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 3 mph W | 2% |
| Sunday | 57°F | Sunny | 3 to 9 mph W | 1% |
| Sunday Night | 34°F | Clear | 5 mph WSW | 1% |
| Monday | 63°F | Sunny | 2 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 6 mph WSW | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.