Round Lake Heights, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Round Lake Heights, IL in one place.
Mostly sunny, with a high near 49.
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: Apr 16, 2026 6:55 AM CDT.
The active forecast window currently covers Apr 19 to Apr 22, 2026 for Round Lake Heights, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 19 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 6:55 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Round Lake Heights
Tuesday looks like the warmest upcoming period in Round Lake Heights at 71 degrees F.
Sunday Night is the coolest period ahead with temperatures near 31 degrees F.
The strongest winds are forecast for Sunday at about 10 to 15 mph WNW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 16, 2026 6:55 AM CDT
- Coverage
- 4 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
Areas of frost after 1am. Mostly clear, with a low around 31.
Areas of frost before 9am. Sunny, with a high near 57.
Partly cloudy, with a low around 45.
Mostly sunny, with a high near 71.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 48.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Apr 19
|
Mostly Sunny
|
49°F |
10 to 15 mph
WNW
|
|
Sunday Night
Apr 19
|
Mostly Clear then Areas Of Frost
|
31°F |
5 to 10 mph
WNW
|
|
Monday
Apr 20
|
Areas Of Frost then Sunny
|
57°F |
5 to 10 mph
SSE
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
45°F |
10 to 15 mph
S
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
71°F |
15 mph
SW
|
|
Tuesday Night
Apr 21
|
Partly Cloudy then Slight Chance Rain Showers
|
48°F |
10 to 15 mph
WSW
|
|
Wednesday
Apr 22
|
Slight Chance Rain Showers then Mostly Sunny
|
66°F |
10 mph
WSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Round Lake Heights.