Round Lake Beach, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Round Lake Beach, IL in one place.
Mostly sunny. High near 76, with temperatures falling to around 74 in the afternoon. Northwest wind 0 to 5 mph.
Local Weather Overview
This forecast page for Round Lake Beach, 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: Aug 23, 2026 7:23 PM CDT.
The active forecast window currently covers Aug 24 to Aug 29, 2026 for Round Lake Beach, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 7:23 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Round Lake Beach
Wednesday looks like the warmest upcoming period in Round Lake Beach at 83 degrees F.
Monday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Wednesday at about 10 to 15 mph SW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 7:23 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KMKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 55. Northeast wind 0 to 5 mph.
Mostly sunny, with a high near 80. Southwest wind 0 to 10 mph.
A slight chance of rain showers between 1am and 4am, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
A chance of showers and thunderstorms. Mostly sunny, with a high near 83.
A chance of showers and thunderstorms before 1am. Mostly clear, with a low around 61.
Sunny, with a high near 81.
Mostly clear, with a low around 59.
Mostly sunny, with a high near 80.
Partly cloudy, with a low around 60.
Mostly sunny, with a high near 80.
A chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 64.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Mostly Sunny
|
76°F |
0 to 5 mph
NW
|
|
Monday Night
Aug 24
|
Mostly Clear
|
55°F |
0 to 5 mph
NE
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
80°F |
0 to 10 mph
SW
|
|
Tuesday Night
Aug 25
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
62°F |
5 to 10 mph
SSW
|
|
Wednesday
Aug 26
|
Chance Showers And Thunderstorms
|
83°F |
10 to 15 mph
SW
|
|
Wednesday Night
Aug 26
|
Chance Showers And Thunderstorms
|
61°F |
5 to 10 mph
W
|
|
Thursday
Aug 27
|
Sunny
|
81°F |
5 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
59°F |
0 to 5 mph
WNW
|
|
Friday
Aug 28
|
Mostly Sunny
|
80°F |
0 to 5 mph
NNE
|
|
Friday Night
Aug 28
|
Partly Cloudy
|
60°F |
0 to 5 mph
ESE
|
|
Saturday
Aug 29
|
Mostly Sunny
|
80°F |
0 to 5 mph
SSE
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms
|
64°F |
5 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Round Lake Beach.