Altona, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Altona, a village in Knox County, Illinois.

Tonight

52°F

Light Rain Likely

Rain likely before 3am, then a slight chance of rain showers. Cloudy, with a low around 52. South southwest wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Altona

When	Temp	Forecast	Wind	Precip
Tonight	52°F	Light Rain Likely	10 to 15 mph SSW	65%
Wednesday	58°F	Chance Rain Showers then Mostly Cloudy	17 mph SW	26%
Wednesday Night	45°F	Mostly Cloudy	10 to 14 mph SW	11%
Thursday	57°F	Chance Light Rain	9 to 15 mph WSW	27%
Thursday Night	42°F	Chance Light Rain	5 to 9 mph NW	31%
Friday	53°F	Slight Chance Light Rain then Partly Sunny	7 to 13 mph N	15%
Friday Night	34°F	Partly Cloudy	1 to 6 mph NNW	1%
Saturday	52°F	Partly Sunny	1 to 5 mph WNW	3%
Saturday Night	34°F	Partly Cloudy	3 mph W	4%
Sunday	59°F	Sunny	3 to 9 mph W	12%
Sunday Night	35°F	Mostly Clear	2 to 6 mph W	2%
Monday	63°F	Sunny	3 to 12 mph SW	1%
Monday Night	40°F	Mostly Clear	7 mph W	0%
Tuesday	64°F	Sunny	7 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

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

All Illinois locations ›

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.