Arlington Heights, IL Weather & Growing Conditions
Today
64°F
Slight Chance Drizzle then Slight Chance Rain Showers
A slight chance of drizzle before 1pm, then a slight chance of rain showers and a slight chance of drizzle. Mostly cloudy. High near 64, with temperatures falling to around 56 in the afternoon. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Slight Chance Drizzle then Slight Chance Rain Showers | 15 mph SW | 19% |
| Tonight | 46°F | Slight Chance Rain | 10 to 15 mph SW | 17% |
| Thursday | 55°F | Rain Likely | 10 to 15 mph W | 61% |
| Thursday Night | 39°F | Chance Rain then Cloudy | 10 mph NNW | 53% |
| Friday | 49°F | Partly Sunny | 10 to 15 mph NNW | 4% |
| Friday Night | 35°F | Partly Cloudy | 5 to 10 mph NNW | 1% |
| Saturday | 51°F | Mostly Sunny | 5 mph NW | 1% |
| Saturday Night | 35°F | Partly Cloudy | 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 1% |
| Monday | 59°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 41°F | Partly Cloudy | 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 0 to 5 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arlington Heights, IL
Last spring frost
Apr 16
First fall frost
Oct 28
Growing season
193 days
Hardiness zone
6a
Explore more for Arlington Heights, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Ohare Intl Ap, Il (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.