Casey, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Casey, a city in Clark County, Illinois.
This Afternoon
77°F
Mostly Sunny
Mostly sunny, with a high near 77. South southeast wind around 18 mph, with gusts as high as 30 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Casey
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Sunny | 18 mph SSE | 11% |
| Tonight | 58°F | Rain | 15 to 20 mph S | 89% |
| Wednesday | 65°F | Chance Light Rain then Mostly Cloudy | 10 to 15 mph SSW | 25% |
| Wednesday Night | 44°F | Mostly Cloudy | 8 mph SW | 0% |
| Thursday | 64°F | Sunny | 7 to 14 mph WSW | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 6 mph WNW | 3% |
| Friday | 58°F | Partly Sunny | 5 to 12 mph NNW | 10% |
| Friday Night | 37°F | Partly Cloudy | 5 to 9 mph NNW | 6% |
| Saturday | 56°F | Mostly Sunny | 6 mph NNW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph WNW | 1% |
| Sunday | 61°F | Sunny | 2 to 9 mph W | 8% |
| Sunday Night | 34°F | Mostly Clear | 6 mph NW | 6% |
| Monday | 63°F | Sunny | 3 to 10 mph W | 4% |
| Monday Night | 38°F | Mostly Clear | 7 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Casey (39.305, -87.985). Updated through the day.
Growing snapshot for Casey
Last spring frost
Apr 14
First fall frost
Oct 20
Growing season
187 days
Hardiness zone
6b
More local growing data for Casey: nearby ZIP 62420 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Casey, Il (1.5 mi from Casey). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.