Arlington Heights, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arlington Heights, a village in Cook County, Illinois.
Overnight
64°F
Patchy Fog
Patchy fog and showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. Low around 64, with temperatures rising to around 66 overnight. East wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Arlington Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Patchy Fog | 5 to 10 mph E | 100% |
| Sunday | 66°F | Patchy Fog | 10 to 15 mph NE | 95% |
| Sunday Night | 57°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph ENE | 18% |
| Monday | 64°F | Chance Rain Showers | 15 mph ENE | 35% |
| Monday Night | 54°F | Slight Chance Rain Showers | 10 to 15 mph ENE | 21% |
| Tuesday | 62°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Tuesday Night | 54°F | Slight Chance Rain Showers | 5 to 15 mph NE | 15% |
| Wednesday | 63°F | Slight Chance Rain Showers | 5 to 10 mph NE | 16% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Thursday | 66°F | Partly Sunny | 5 mph NE | 4% |
| Thursday Night | 55°F | Mostly Cloudy | 0 to 5 mph NE | 13% |
| Friday | 70°F | Partly Sunny | 0 to 5 mph NE | 12% |
| Friday Night | 55°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Saturday | 72°F | Mostly Sunny | 0 to 5 mph ENE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Arlington Heights (42.097, -87.982). Updated through the day.
Growing snapshot for Arlington Heights
Last spring frost
Apr 19
First fall frost
Oct 26
Growing season
190 days
Hardiness zone
6a
More local growing data for Arlington Heights: nearby ZIP 60004 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Chicago Palwaukee Ap, Il (3.9 mi from Arlington Heights). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.