Lanark, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Lanark, IL in one place.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms likely between 7am and 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers and thunderstorms. Mostly cloudy, with a high near 73. Southwest wind 10 to 15 mph. Chance of precipitation is 90%.
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: Apr 14, 2026 9:21 PM CDT.
The active forecast window currently covers Apr 15 to Apr 21, 2026 for Lanark, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 15 to Apr 21, 2026
- Latest sync
- Apr 14, 2026 9:21 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Lanark
Friday looks like the warmest upcoming period in Lanark at 80 degrees F.
Saturday Night is the coolest period ahead with temperatures near 32 degrees F.
The strongest winds are forecast for Saturday at about 15 to 20 mph W.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 14, 2026 9:21 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
Showers and thunderstorms likely before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
A chance of showers and thunderstorms. Partly sunny, with a high near 72. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 53. Chance of precipitation is 40%.
A slight chance of rain showers after 1pm. Partly sunny, with a high near 80.
A slight chance of rain showers before 7pm, then showers and thunderstorms. Mostly cloudy, with a low around 47. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a high near 58. Chance of precipitation is 90%.
A chance of rain showers before 7pm. Partly cloudy, with a low around 32. Chance of precipitation is 30%.
Sunny, with a high near 51.
Mostly clear, with a low around 32.
Sunny, with a high near 59.
Mostly clear, with a low around 40.
Mostly sunny, with a high near 67.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Apr 15
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
73°F |
10 to 15 mph
SW
|
|
Wednesday Night
Apr 15
|
Showers And Thunderstorms Likely
|
57°F |
5 to 10 mph
SW
|
|
Thursday
Apr 16
|
Chance Showers And Thunderstorms
|
72°F |
5 to 10 mph
SW
|
|
Thursday Night
Apr 16
|
Chance Showers And Thunderstorms then Mostly Clear
|
53°F |
5 mph
S
|
|
Friday
Apr 17
|
Partly Sunny then Slight Chance Rain Showers
|
80°F |
5 to 15 mph
SE
|
|
Friday Night
Apr 17
|
Showers And Thunderstorms
|
47°F |
15 mph
S
|
|
Saturday
Apr 18
|
Showers And Thunderstorms
|
58°F |
15 to 20 mph
W
|
|
Saturday Night
Apr 18
|
Chance Rain Showers then Partly Cloudy
|
32°F |
15 to 20 mph
W
|
|
Sunday
Apr 19
|
Sunny
|
51°F |
15 mph
NW
|
|
Sunday Night
Apr 19
|
Mostly Clear
|
32°F |
5 to 10 mph
NW
|
|
Monday
Apr 20
|
Sunny
|
59°F |
5 to 10 mph
SE
|
|
Monday Night
Apr 20
|
Mostly Clear
|
40°F |
10 mph
SE
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
67°F |
10 to 15 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lanark.