Lanark, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Lanark, IL in one place.
Mostly cloudy. High near 82, with temperatures falling to around 80 in the afternoon. East wind 10 to 15 mph, with gusts as high as 25 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: May 30, 2026 2:15 PM CDT.
The active forecast window currently covers May 30 to Jun 5, 2026 for Lanark, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 30 to Jun 5, 2026
- Latest sync
- May 30, 2026 2:15 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Lanark
Thursday looks like the warmest upcoming period in Lanark at 87 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for This Afternoon at about 10 to 15 mph E.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- May 30, 2026 2:15 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
Mostly cloudy. Low around 55, with temperatures rising to around 57 overnight. East wind 10 to 15 mph, with gusts as high as 25 mph.
Partly sunny, with a high near 80. Southeast wind 5 to 10 mph.
A slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. East wind around 5 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 83.
Partly cloudy, with a low around 55.
Sunny, with a high near 83.
Mostly clear, with a low around 54.
Sunny, with a high near 85.
Mostly clear, with a low around 59.
Mostly sunny, with a high near 87.
A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
May 30
|
Mostly Cloudy
|
82°F |
10 to 15 mph
E
|
|
Tonight
May 30
|
Mostly Cloudy
|
55°F |
10 to 15 mph
E
|
|
Sunday
May 31
|
Partly Sunny
|
80°F |
5 to 10 mph
SE
|
|
Sunday Night
May 31
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
58°F |
5 mph
E
|
|
Monday
Jun 1
|
Slight Chance Showers And Thunderstorms then Mostly Sunny
|
83°F |
5 mph
E
|
|
Monday Night
Jun 1
|
Partly Cloudy
|
55°F |
5 to 10 mph
E
|
|
Tuesday
Jun 2
|
Sunny
|
83°F |
5 to 10 mph
E
|
|
Tuesday Night
Jun 2
|
Mostly Clear
|
54°F |
5 to 10 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
85°F |
5 mph
SE
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
59°F |
5 mph
S
|
|
Thursday
Jun 4
|
Mostly Sunny
|
87°F |
5 to 10 mph
S
|
|
Thursday Night
Jun 4
|
Chance Showers And Thunderstorms
|
65°F |
5 to 10 mph
S
|
|
Friday
Jun 5
|
Chance Showers And Thunderstorms
|
87°F |
10 mph
SW
|
|
Friday Night
Jun 5
|
Chance Showers And Thunderstorms
|
65°F |
5 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lanark.