Mark, IL Weather & Growing Conditions
Overnight
63°F
Mostly Clear
Mostly clear. Low around 63, with temperatures rising to around 65 overnight. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 86°F | Mostly Sunny | 5 to 10 mph S | 2% |
| Tuesday Night | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 22% |
| Wednesday | 81°F | Chance Showers And Thunderstorms | 5 mph SW | 54% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph N | 86% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 5 mph E | 64% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 31% |
| Friday | 82°F | Mostly Sunny | 0 mph | 14% |
| Friday Night | 66°F | Mostly Clear | 0 mph | 14% |
| Saturday | 85°F | Mostly Sunny | 5 mph SW | 8% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 8% |
| Sunday | 87°F | Sunny | 10 to 15 mph SW | 9% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 29% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 29% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mark, IL
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
Explore more for Mark, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Hennepin Wtr Trmt Plt, Il (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.