Round Lake Heights, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy then Slight Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Round Lake Heights, IL in one place.
A slight chance of rain showers after 1pm. Mostly cloudy, with a high near 72. East northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Round Lake Heights, 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: Sep 17, 2026 7:28 AM CDT.
The active forecast window currently covers Sep 18 to Sep 23, 2026 for Round Lake Heights, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 18 to Sep 23, 2026
- Latest sync
- Sep 17, 2026 7:28 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Round Lake Heights
Saturday looks like the warmest upcoming period in Round Lake Heights at 78 degrees F.
Monday Night is the coolest period ahead with temperatures near 51 degrees F.
The strongest winds are forecast for Friday Night at about 10 to 15 mph ESE.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 17, 2026 7:28 AM 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
A chance of rain showers before 1am, then showers and thunderstorms. Mostly cloudy, with a low around 61. East southeast wind 10 to 15 mph. Chance of precipitation is 80%.
Showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 90%.
Showers and thunderstorms likely. Cloudy, with a low around 60.
Showers and thunderstorms likely. Mostly cloudy, with a high near 67.
A chance of rain showers. Cloudy, with a low around 53.
Rain showers likely. Cloudy, with a high near 64.
A chance of rain showers. Mostly cloudy, with a low around 51.
A slight chance of rain showers. Partly sunny, with a high near 65.
A slight chance of rain showers before 1am. Mostly cloudy, with a low around 52.
Partly sunny, with a high near 70.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Sep 18
|
Mostly Cloudy then Slight Chance Rain Showers
|
72°F |
5 to 10 mph
ENE
|
|
Friday Night
Sep 18
|
Showers And Thunderstorms
|
61°F |
10 to 15 mph
ESE
|
|
Saturday
Sep 19
|
Showers And Thunderstorms
|
78°F |
10 to 15 mph
S
|
|
Saturday Night
Sep 19
|
Showers And Thunderstorms Likely
|
60°F |
5 to 10 mph
ENE
|
|
Sunday
Sep 20
|
Showers And Thunderstorms Likely
|
67°F |
10 to 15 mph
NE
|
|
Sunday Night
Sep 20
|
Chance Rain Showers
|
53°F |
10 to 15 mph
ENE
|
|
Monday
Sep 21
|
Rain Showers Likely
|
64°F |
10 to 15 mph
ENE
|
|
Monday Night
Sep 21
|
Chance Rain Showers
|
51°F |
5 to 15 mph
ENE
|
|
Tuesday
Sep 22
|
Slight Chance Rain Showers
|
65°F |
10 mph
ENE
|
|
Tuesday Night
Sep 22
|
Slight Chance Rain Showers
|
52°F |
0 to 5 mph
NE
|
|
Wednesday
Sep 23
|
Partly Sunny
|
70°F |
0 to 5 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Round Lake Heights.