La Salle County, IL Weather Forecast
County weather hub
Rain
Compare major city weather across LaSalle County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Rain before 1pm, then rain and a slight chance of thunderstorms. Mostly cloudy, with a high near 64. East southeast wind 5 to 10 mph. Chance of precipitation is 90%.
County Weather Overview
This county weather page brings together forecast coverage for LaSalle County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 9 of 9 mapped cities in LaSalle County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 15 to Oct 20, 2026
- Latest sync
- Oct 14, 2026 4:04 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in LaSalle County
Tuesday looks like the warmest upcoming period in LaSalle County at 74 degrees F.
Friday Night is the coolest period ahead with temperatures near 35 degrees F.
The strongest winds are forecast for Friday at about 20 mph NW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 14, 2026 4:04 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Rain and a slight chance of thunderstorms before 1am. Mostly cloudy, with a low around 48. West wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
A slight chance of rain between 7am and 1pm. Partly sunny, with a high near 56. Chance of precipitation is 20%.
Areas of frost after 4am. Mostly clear, with a low around 35.
Areas of frost before 9am. Sunny, with a high near 56.
Clear, with a low around 40.
Sunny, with a high near 68.
Partly cloudy, with a low around 47.
Mostly sunny, with a high near 70.
Partly cloudy, with a low around 47.
Mostly sunny, with a high near 74.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 15
|
Rain
|
64°F |
5 to 10 mph
ESE
|
|
Thursday Night
Oct 15
|
Rain
|
48°F |
5 to 15 mph
W
|
|
Friday
Oct 16
|
Slight Chance Rain
|
56°F |
20 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear then Areas Of Frost
|
35°F |
5 to 15 mph
NNW
|
|
Saturday
Oct 17
|
Areas Of Frost then Sunny
|
56°F |
0 to 5 mph
WNW
|
|
Saturday Night
Oct 17
|
Clear
|
40°F |
5 mph
SSW
|
|
Sunday
Oct 18
|
Sunny
|
68°F |
5 to 10 mph
SSW
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
47°F |
5 mph
SSW
|
|
Monday
Oct 19
|
Mostly Sunny
|
70°F |
5 mph
SSW
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
47°F |
0 mph
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
74°F |
0 to 5 mph
S
|
Major City Forecasts
Live forecast snapshots for major cities across LaSalle County.
Coverage
Forecast coverage currently spans 9 of 9 mapped cities in LaSalle County.
Largest mapped city population in this region: 18,097.
