Prospect Heights, IL Weather & Growing Conditions
Tonight
61°F
Rain
Rain. Cloudy, with a low around 61. South wind around 15 mph, with gusts as high as 25 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 | 81% |
| Wednesday | 64°F | Rain Likely then Rain Showers Likely | 15 mph SSW | 58% |
| Wednesday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 19% |
| Thursday | 57°F | Chance Rain Showers | 10 to 15 mph WSW | 32% |
| Thursday Night | 42°F | Rain Showers Likely | 5 to 10 mph WNW | 55% |
| Friday | 53°F | Chance Rain Showers | 10 to 15 mph N | 33% |
| Friday Night | 37°F | Mostly Cloudy | 5 to 10 mph NNW | 11% |
| Saturday | 53°F | Mostly Sunny | 5 mph WNW | 8% |
| Saturday Night | 36°F | Partly Cloudy | 0 to 5 mph WSW | 7% |
| Sunday | 58°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 17% |
| Sunday Night | 37°F | Mostly Clear | 5 mph WNW | 9% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph WSW | 4% |
| Monday Night | 41°F | Partly Cloudy | 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 Prospect Heights, IL
Last spring frost
Apr 19
First fall frost
Oct 26
Growing season
190 days
Hardiness zone
6a
Explore more for Prospect Heights, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Palwaukee Ap, Il (1.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.