Lanark, IL Weather Forecast
Local 7-day forecast
Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Lanark, IL in one place.
Rain showers. Cloudy, with a high near 58. East wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
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: Oct 15, 2026 11:42 AM CDT.
The active forecast window currently covers Oct 15 to Oct 21, 2026 for Lanark, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 11:42 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Lanark
Wednesday looks like the warmest upcoming period in Lanark at 71 degrees F.
Friday Night is the coolest period ahead with temperatures near 31 degrees F.
The strongest winds are forecast for Friday at about 20 to 25 mph NW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 15, 2026 11:42 AM 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
Rain showers likely before 10pm. Mostly cloudy. Low around 43, with temperatures rising to around 45 overnight. Northwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
A chance of rain showers between 10am and 4pm. Mostly cloudy, with a high near 52. Northwest wind 20 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 40%.
Widespread frost after 1am. Mostly clear, with a low around 31. North wind 0 to 20 mph, with gusts as high as 35 mph.
Widespread frost before 9am. Sunny, with a high near 55.
Areas of frost after 4am. Clear, with a low around 36.
Areas of frost before 8am. Sunny, with a high near 63.
Mostly clear, with a low around 39.
Mostly sunny, with a high near 66.
Partly cloudy, with a low around 41.
Sunny, with a high near 69.
Mostly clear, with a low around 44.
Mostly sunny, with a high near 71.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 49.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Oct 15
|
Rain Showers
|
58°F |
5 mph
E
|
|
Tonight
Oct 15
|
Rain Showers Likely then Mostly Cloudy
|
43°F |
10 to 20 mph
NW
|
|
Friday
Oct 16
|
Chance Rain Showers
|
52°F |
20 to 25 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear then Widespread Frost
|
31°F |
0 to 20 mph
N
|
|
Saturday
Oct 17
|
Widespread Frost then Sunny
|
55°F |
0 to 10 mph
W
|
|
Saturday Night
Oct 17
|
Clear then Areas Of Frost
|
36°F |
5 to 10 mph
SW
|
|
Sunday
Oct 18
|
Areas Of Frost then Sunny
|
63°F |
10 to 15 mph
SW
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
39°F |
5 to 10 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
66°F |
0 to 5 mph
S
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
41°F |
0 mph
|
|
Tuesday
Oct 20
|
Sunny
|
69°F |
0 to 5 mph
SE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
44°F |
0 to 5 mph
SE
|
|
Wednesday
Oct 21
|
Mostly Sunny
|
71°F |
5 to 10 mph
S
|
|
Wednesday Night
Oct 21
|
Partly Cloudy then Slight Chance Rain Showers
|
49°F |
5 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lanark.