Lanark, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Lanark, IL in one place.
Sunny, with a high near 94. West wind around 0 mph.
Local Weather Overview
This forecast page for Lanark, 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 4:06 PM CDT.
The active forecast window currently covers Jul 14 to Jul 20, 2026 for Lanark, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 14 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 4:06 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Lanark
This Afternoon looks like the warmest upcoming period in Lanark at 94 degrees F.
Monday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Saturday at about 5 to 15 mph W.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 4:06 PM CDT
- Coverage
- 7 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
Patchy fog after 3am. Mostly clear, with a low around 70. West wind around 0 mph.
Patchy fog before 9am. Sunny, with a high near 93. Heat index values as high as 101. West wind around 0 mph.
Partly cloudy, with a low around 71. Heat index values as high as 101. Southwest wind around 0 mph.
A slight chance of rain showers between 1pm and 4pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 92.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71.
A chance of showers and thunderstorms between 7am and 10am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72. Chance of precipitation is 50%.
Sunny, with a high near 91.
Mostly clear, with a low around 69.
Sunny, with a high near 88.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89.
A slight chance of rain showers before 7pm, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jul 14
|
Sunny
|
94°F |
0 mph
|
|
Tonight
Jul 14
|
Mostly Clear then Patchy Fog
|
70°F |
0 mph
|
|
Wednesday
Jul 15
|
Patchy Fog then Sunny
|
93°F |
0 mph
|
|
Wednesday Night
Jul 15
|
Partly Cloudy
|
71°F |
0 mph
|
|
Thursday
Jul 16
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
92°F |
0 to 5 mph
SW
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms
|
71°F |
0 to 5 mph
S
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
91°F |
0 to 5 mph
SW
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms
|
72°F |
5 mph
SW
|
|
Saturday
Jul 18
|
Sunny
|
91°F |
5 to 15 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
69°F |
5 to 10 mph
N
|
|
Sunday
Jul 19
|
Sunny
|
88°F |
5 mph
SE
|
|
Sunday Night
Jul 19
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
69°F |
5 mph
S
|
|
Monday
Jul 20
|
Slight Chance Showers And Thunderstorms
|
89°F |
5 to 15 mph
SW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
67°F |
5 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lanark.