Marcus, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Marcus, IL in one place.
Sunny, with a high near 94. Heat index values as high as 100. Northwest wind around 0 mph.
Local Weather Overview
This forecast page for Marcus, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 14, 2026 5:34 AM CDT.
The active forecast window currently covers Jul 15 to Jul 20, 2026 for Marcus, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 15 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 5:34 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Marcus
Wednesday looks like the warmest upcoming period in Marcus at 94 degrees F.
Sunday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Saturday at about 5 to 10 mph W.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 5:34 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 73.
Sunny, with a high near 92.
Mostly clear, with a low around 73.
A chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Sunny, with a high near 92. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 92.
A slight chance of showers and thunderstorms. Mostly clear, with a low around 70.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 89.
A slight chance of rain showers after 1am. Mostly clear, with a low around 67.
A slight chance of rain showers before 7am. Sunny, with a high near 87.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jul 15
|
Sunny
|
94°F |
0 mph
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
73°F |
0 mph
|
|
Thursday
Jul 16
|
Sunny
|
92°F |
0 mph
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
73°F |
0 mph
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
92°F |
0 to 5 mph
S
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms
|
73°F |
0 to 5 mph
SW
|
|
Saturday
Jul 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
92°F |
5 to 10 mph
W
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms
|
70°F |
5 to 10 mph
NW
|
|
Sunday
Jul 19
|
Slight Chance Showers And Thunderstorms then Sunny
|
89°F |
5 to 10 mph
N
|
|
Sunday Night
Jul 19
|
Mostly Clear then Slight Chance Rain Showers
|
67°F |
5 mph
E
|
|
Monday
Jul 20
|
Slight Chance Rain Showers then Sunny
|
87°F |
5 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Marcus.