South Barrington, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for South Barrington, IL in one place.
Mostly sunny. High near 89, with temperatures falling to around 85 in the afternoon. Heat index values as high as 98. West northwest wind 10 to 15 mph. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for South Barrington, 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 17, 2026 8:42 AM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for South Barrington, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 8:42 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in South Barrington
Saturday looks like the warmest upcoming period in South Barrington at 89 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Saturday at about 10 to 15 mph WNW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 8:42 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
Partly cloudy, with a low around 64. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunny, with a high near 83. Northeast wind around 5 mph.
Partly cloudy, with a low around 65.
A slight chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 86.
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 70.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 84.
Mostly clear, with a low around 61.
Sunny, with a high near 78.
Mostly clear, with a low around 59.
Sunny, with a high near 80.
Partly cloudy, with a low around 61.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Mostly Sunny
|
89°F |
10 to 15 mph
WNW
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
64°F |
5 to 10 mph
NE
|
|
Sunday
Jul 19
|
Sunny
|
83°F |
5 mph
NE
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
65°F |
5 mph
SE
|
|
Monday
Jul 20
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
86°F |
5 to 15 mph
SSW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
70°F |
10 to 15 mph
WSW
|
|
Tuesday
Jul 21
|
Chance Showers And Thunderstorms then Mostly Sunny
|
84°F |
10 to 15 mph
WNW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
61°F |
5 to 15 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
78°F |
5 to 10 mph
N
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
59°F |
0 to 10 mph
NW
|
|
Thursday
Jul 23
|
Sunny
|
80°F |
0 to 5 mph
W
|
|
Thursday Night
Jul 23
|
Partly Cloudy
|
61°F |
0 to 5 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around South Barrington.