St. Augustine, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Augustine, a village in Knox County, Illinois.
Overnight
53°F
Cloudy
Cloudy, with a low around 53. Southwest wind around 12 mph, with gusts as high as 24 mph.
7-day forecast for St. Augustine
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Cloudy | 12 mph SW | 13% |
| Wednesday | 57°F | Slight Chance Light Rain then Slight Chance Drizzle | 13 to 16 mph WSW | 15% |
| Wednesday Night | 44°F | Slight Chance Drizzle then Cloudy | 13 mph WSW | 10% |
| Thursday | 56°F | Slight Chance Light Rain | 10 to 14 mph W | 23% |
| Thursday Night | 42°F | Slight Chance Light Rain then Mostly Cloudy | 8 mph NW | 22% |
| Friday | 51°F | Partly Sunny | 6 to 10 mph N | 8% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 1 mph WNW | 1% |
| Sunday | 58°F | Sunny | 1 to 7 mph WNW | 1% |
| Sunday Night | 34°F | Clear | 2 mph W | 0% |
| Monday | 64°F | Sunny | 0 to 7 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 1 to 5 mph WSW | 0% |
| Tuesday | 65°F | Sunny | 3 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for St. Augustine (40.721, -90.407). Updated through the day.
Growing snapshot for St. Augustine
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
177 days
Hardiness zone
5b
More local growing data for St. Augustine: nearby ZIP 61474 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
Altona
East Galesburg
Galesburg
Gilson
Henderson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
Rio
Victoria
Wataga
Williamsfield
Yates City
Climate data from the nearest NOAA station, Avon, Il (6.1 mi from St. Augustine). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.