Bethalto, IL Weather & Growing Conditions
Tonight
72°F
Partly Cloudy
Partly cloudy, with a low around 72. Southeast wind 3 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Partly Cloudy | 3 to 8 mph SE | 12% |
| Saturday | 98°F | Mostly Sunny | 5 to 8 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 6 mph SW | 4% |
| Sunday | 93°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 8 mph W | 27% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph N | 63% |
| Monday | 80°F | Showers And Thunderstorms Likely | 7 to 13 mph NE | 67% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 8 to 13 mph NE | 67% |
| Tuesday | 73°F | Chance Rain Showers then Mostly Cloudy | 13 mph N | 26% |
| Tuesday Night | 53°F | Mostly Cloudy | 6 to 13 mph N | 5% |
| Wednesday | 76°F | Mostly Sunny | 7 to 10 mph N | 2% |
| Wednesday Night | 54°F | Partly Cloudy | 3 to 9 mph N | 2% |
| Thursday | 77°F | Mostly Sunny | 5 to 9 mph N | 3% |
| Thursday Night | 56°F | Partly Cloudy | 3 to 9 mph NE | 3% |
| Friday | 77°F | Mostly Sunny | 5 to 8 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bethalto, IL
Last spring frost
Apr 4
First fall frost
Nov 5
Growing season
214 days
Hardiness zone
6b
Explore more for Bethalto, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Alton - Melvin Price L&D, Il (6.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.