St. Augustine, IL Weather & Growing Conditions
Today
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 7 mph SSW | 0% |
| Tonight | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 3 mph SSE | 37% |
| Wednesday | 82°F | Chance Showers And Thunderstorms | 3 mph S | 63% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph N | 85% |
| Thursday | 81°F | Showers And Thunderstorms Likely | 2 mph NE | 72% |
| Thursday Night | 63°F | Partly Cloudy | 1 mph NNE | 8% |
| Friday | 83°F | Mostly Sunny | 1 mph S | 9% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 13% |
| Saturday | 86°F | Sunny | 1 to 5 mph SSW | 12% |
| Saturday Night | 69°F | Mostly Clear | 5 mph S | 9% |
| Sunday | 88°F | Sunny | 5 to 10 mph SSW | 8% |
| Sunday Night | 70°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 to 8 mph S | 25% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 6 to 9 mph SSW | 25% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 29% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Augustine, IL
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
177 days
Hardiness zone
5b
Explore more for St. Augustine, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Avon, Il (6.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.