Eldorado, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eldorado, a city in Saline County, Illinois.
Tonight
71°F
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 10pm. Partly cloudy. Low around 71, with temperatures rising to around 73 overnight. Southeast wind 1 to 5 mph. Chance of precipitation is 20%.
7-day forecast for Eldorado
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SE | 23% |
| Saturday | 98°F | Sunny | 1 to 7 mph SW | 5% |
| Saturday Night | 73°F | Partly Cloudy | 3 mph SSW | 3% |
| Sunday | 98°F | Sunny | 3 to 7 mph WSW | 7% |
| Sunday Night | 70°F | Partly Cloudy | 5 mph N | 10% |
| Monday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 9 mph NNE | 39% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 6 to 10 mph NNE | 41% |
| Tuesday | 77°F | Chance Showers And Thunderstorms | 7 to 13 mph N | 32% |
| Tuesday Night | 58°F | Mostly Cloudy | 5 to 13 mph N | 8% |
| Wednesday | 76°F | Mostly Sunny | 5 to 9 mph N | 3% |
| Wednesday Night | 57°F | Partly Cloudy | 2 to 8 mph NNE | 3% |
| Thursday | 78°F | Mostly Sunny | 2 to 9 mph N | 3% |
| Thursday Night | 58°F | Partly Cloudy | 2 to 7 mph NNE | 3% |
| Friday | 77°F | Mostly Sunny | 3 to 9 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Eldorado (37.812, -88.442). Updated through the day.
Growing snapshot for Eldorado
Last spring frost
Apr 7
First fall frost
Oct 26
Growing season
202 days
Hardiness zone
7a
More local growing data for Eldorado: nearby ZIP 62930 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Harrisburg, Il (8.6 mi from Eldorado). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.