Mark, IL Weather & Growing Conditions
Today
81°F
Patchy Fog
Patchy fog and showers and thunderstorms likely before 3pm. Mostly cloudy, with a high near 81. Southeast wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Patchy Fog | 5 to 10 mph SE | 67% |
| Tonight | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 85% |
| Sunday | 72°F | Patchy Fog | 5 to 15 mph NE | 87% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 15 mph NE | 47% |
| Monday | 65°F | Rain Showers Likely | 15 mph NE | 63% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 22% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Partly Cloudy | 10 to 15 mph NE | 17% |
| Wednesday | 67°F | Mostly Sunny | 10 mph NE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 69°F | Mostly Sunny | 5 mph NE | 3% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NE | 3% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 3% |
| Friday Night | 53°F | Partly Cloudy | 5 mph NE | 2% |
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 Sep 19, 2026.