Bethalto, IL Weather & Growing Conditions
Overnight
54°F
Slight Chance Drizzle
A slight chance of drizzle. Mostly cloudy, with a low around 54. Southwest wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Drizzle | 9 mph SW | 12% |
| Wednesday | 59°F | Slight Chance Drizzle | 9 to 14 mph W | 12% |
| Wednesday Night | 43°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Thursday | 64°F | Sunny | 6 to 12 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 6 mph NW | 2% |
| Friday | 57°F | Partly Sunny | 7 to 12 mph N | 1% |
| Friday Night | 34°F | Partly Cloudy | 2 to 8 mph N | 0% |
| Saturday | 56°F | Mostly Sunny | 2 to 6 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 60°F | Sunny | 2 to 7 mph NW | 1% |
| Sunday Night | 34°F | Clear | 3 mph W | 0% |
| Monday | 65°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 39°F | Clear | 3 mph SW | 0% |
| Tuesday | 68°F | Sunny | 2 to 6 mph W | 1% |
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 Nov 4, 2026.