Crystal Lake, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Crystal Lake, IL in one place.
Sunny, with a high near 89. Heat index values as high as 97. West northwest wind around 10 mph, with gusts as high as 20 mph.
Local Weather Overview
This forecast page for Crystal Lake, 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 6:30 AM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Crystal Lake, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 6:30 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Crystal Lake
Saturday looks like the warmest upcoming period in Crystal Lake at 89 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Monday at about 5 to 15 mph SSW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 6:30 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 63. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunny, with a high near 84.
Partly cloudy, with a low around 64.
A slight chance of rain showers between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. 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 60.
Sunny, with a high near 79.
Mostly clear, with a low around 58.
Sunny, with a high near 80.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny
|
89°F |
10 mph
WNW
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
63°F |
5 to 10 mph
NE
|
|
Sunday
Jul 19
|
Sunny
|
84°F |
5 mph
ENE
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
64°F |
5 mph
SE
|
|
Monday
Jul 20
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
86°F |
5 to 15 mph
SSW
|
|
Monday Night
Jul 20
|
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
|
60°F |
5 to 15 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
79°F |
5 to 10 mph
NNW
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
58°F |
0 to 10 mph
NW
|
|
Thursday
Jul 23
|
Sunny
|
80°F |
0 to 5 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Crystal Lake.
