Bethany, IL Weather & Growing Conditions
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South southeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 mph SSE | 0% |
| Tonight | 65°F | Mostly Clear | 5 mph SSE | 0% |
| Wednesday | 87°F | Sunny | 3 to 7 mph S | 4% |
| Wednesday Night | 67°F | Slight Chance Showers And Thunderstorms | 6 mph S | 66% |
| Thursday | 82°F | Showers And Thunderstorms | 3 to 7 mph SSW | 77% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 26% |
| Friday | 84°F | Partly Sunny | 5 mph SW | 14% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 19% |
| Saturday | 86°F | Slight Chance Rain Showers then Mostly Sunny | 6 mph SSW | 19% |
| Saturday Night | 69°F | Mostly Clear | 3 to 7 mph S | 13% |
| Sunday | 88°F | Sunny | 7 to 12 mph SSW | 6% |
| Sunday Night | 71°F | Mostly Clear | 10 mph SSW | 10% |
| Monday | 89°F | Mostly Sunny | 10 mph SSW | 11% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bethany, IL
Last spring frost
Apr 15
First fall frost
Oct 22
Growing season
187 days
Hardiness zone
6a
Explore more for Bethany, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Sullivan 3S, Il (9.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.