Markham, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Markham, a city in Cook County, Illinois.
Overnight
64°F
Mostly Clear
Mostly clear, with a low around 64. South wind around 5 mph.
7-day forecast for Markham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 85°F | Mostly Sunny | 5 to 10 mph SSW | 3% |
| Tuesday Night | 68°F | Mostly Cloudy | 5 mph SSW | 7% |
| Wednesday | 82°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph SW | 50% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph WSW | 87% |
| Thursday | 78°F | Rain Showers then Chance Showers And Thunderstorms | 5 mph SSE | 87% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 42% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SSW | 6% |
| Friday Night | 65°F | Partly Cloudy | 0 to 5 mph S | 8% |
| Saturday | 84°F | Mostly Sunny | 5 mph SSW | 10% |
| Saturday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 16% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 15 mph SW | 16% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 40% |
| Monday | 86°F | Chance Rain Showers | 5 to 10 mph SW | 40% |
Forecast source: National Weather Service (api.weather.gov) for Markham (41.600, -87.690). Updated through the day.
Growing snapshot for Markham
Last spring frost
Apr 23
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
6a
More local growing data for Markham: nearby ZIP 60428 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Park Forest, Il (7.3 mi from Markham). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.