Altona, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altona, a village in Knox County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. South southwest wind 6 to 9 mph.
7-day forecast for Altona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 6 to 9 mph SSW | 0% |
| Tonight | 67°F | Chance Showers And Thunderstorms | 5 mph SSE | 55% |
| Wednesday | 79°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 mph WSW | 64% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 2 to 6 mph N | 82% |
| Thursday | 79°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph NNE | 60% |
| Thursday Night | 63°F | Mostly Clear | 0 to 3 mph NE | 8% |
| Friday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 3 mph S | 17% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SSE | 17% |
| Saturday | 85°F | Sunny | 3 to 8 mph SSW | 10% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 9% |
| Sunday | 86°F | Sunny | 10 to 14 mph SSW | 9% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph S | 31% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 8 to 13 mph SSW | 31% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 12 mph SSW | 33% |
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 Aug 4, 2026.