Westchester, IL Weather & Growing Conditions
Tonight
61°F
Rain
Rain. Cloudy. Low around 61, with temperatures rising to around 63 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Rain | 15 mph S | 83% |
| Wednesday | 64°F | Chance Rain then Rain Showers Likely | 15 mph SSW | 58% |
| Wednesday Night | 49°F | Mostly Cloudy | 15 mph SW | 14% |
| Thursday | 58°F | Chance Rain Showers | 10 to 15 mph WSW | 27% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 10 mph WNW | 47% |
| Friday | 53°F | Chance Rain Showers | 10 to 15 mph N | 33% |
| Friday Night | 39°F | Mostly Cloudy | 5 to 10 mph NNW | 12% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 10% |
| Saturday Night | 38°F | Partly Cloudy | 5 mph WSW | 6% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 39°F | Mostly Clear | 5 to 10 mph W | 10% |
| Monday | 60°F | Sunny | 5 to 15 mph WSW | 5% |
| Monday Night | 43°F | Mostly Clear | 5 to 10 mph W | 2% |
| Tuesday | 61°F | Mostly Sunny | 5 to 10 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Westchester, IL
Last spring frost
Apr 11
First fall frost
Oct 31
Growing season
201 days
Hardiness zone
6a
Explore more for Westchester, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Midway Ap, Il (8.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.