Grayslake, IL Hourly Weather Updates

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Grayslake Weather Map
UTC Time: 9/13/2026, 17:50
Your Time:

Aeronautical Observation: Automated synoptic observations via NWS Gateway.
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Grayslake, IL Regional Weather

Expires:202609131800;;390354
ASUS43 KLOT 131711
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1200 PM CDT SUN SEP 13 2026

NOTE: "FAIR" INDICATES FEW OR NO CLOUDS BELOW 12,000 FEET WITH NO
SIGNIFICANT WEATHER AND/OR OBSTRUCTIONS TO VISIBILITY.

* THESE STATIONS ARE NOT UNDER NWS QUALITY CONTROL. THEY ALSO MAY NOT
  REPORT WEATHER SUCH AS PRECIPITATION OR FOG.


ILZ005-006-012>014-019>023-131800-
NORTHEAST ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CHICAGO-OHARE  MOSUNNY   74  50  42 NW8       30.11R TC  23           
CHICAGO-MIDWAY PTSUNNY   73  52  47 N8        30.10R TC  23           
AURORA         CLOUDY    71  48  43 N13G22    30.14R TC  22           
JOLIET*        PTSUNNY   75  49  41 N8        30.11R TC  24           
WAUKEGAN       PTSUNNY   70  51  51 N8        30.12R TC  21           
DUPAGE AIRPORT PTSUNNY   72  50  45 N13       30.13R TC  22           
KANKAKEE*      MOSUNNY   77  51  41 N14G20    30.09S TC  25           
WHEELING       MOSUNNY   71  53  52 VRB6      30.13R TC  22           
LANSING*       MOSUNNY   72  56  57 NE9       30.10R TC  22           
NORTHERLY ISL*   N/A     71  57  61 N7          N/A  TC  22           
$$


SKY/WX - Weather  TMP - Temperature  DP - Dew Point  RH - Humidity
WIND - Wind Direction/Speed PRES - Barometric Pressure VSB - Visibility
WCI - Wind Chill Index E13G22 Wind - East Wind 13 mph/Gusts of 22 mph

Grayslake, IL

Afternoon
Cloudy
78°/ 48° 26°/
20%
Monday
Sunny
72°/ 58° 22°/ 14°
0%
Tuesday
Thunderstorms
85°/ 65° 29°/ 18°
80%
Wednesday
Thunderstorms
78°/ 68° 26°/ 20°
80%
Thursday
Thunderstorms
80°/ 62° 27°/ 17°
50%
Friday
Thunderstorms
78°/ 60° 26°/ 16°
40%

Day: Partly cloudy. Highs in the upper 70s. Northwest winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear. A slight chance of showers in the evening. Lows in the upper 40s. Northwest winds 10 to 15 mph with gusts up to 25 mph, becoming north around 5 mph after midnight. Chance of rain 20 percent.

Crystal Lake, IL

Today
Rain Showers
70°/ 45° 21°/
70%
Monday
Mostly Cloudy
72°/ 68° 22°/ 20°
70%
Tuesday
Thunderstorms
80°/ 58° 27°/ 14°
80%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
70%
Friday
Rain Showers
75°/ 58° 24°/ 14°
50%

Day: Mostly cloudy. Isolated showers late in the morning, then numerous showers early in the afternoon. Scattered showers late. Highs around 70. Northwest winds 5 to 10 mph. Chance of precipitation 70 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the mid 40s. Northwest winds around 5 mph in the evening, becoming light and variable.

Kenosha, WI

Today
Rain Showers
68°/ 48° 20°/
60%
Monday
Partly Cloudy
72°/ 62° 22°/ 17°
60%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
80%
Thursday
Thunderstorms
75°/ 60° 24°/ 16°
60%
Friday
Thunderstorms
72°/ 58° 22°/ 14°
50%

Day: Cooler. Partly sunny then becoming cloudy early in the afternoon then becoming partly sunny. Isolated light showers late in the morning, then numerous light showers early in the afternoon. Scattered light showers late in the afternoon. Highs in the upper 60s. Northwest winds 5 to 10 mph. Chance of showers 60 percent.

Night: Clear. Lows in the upper 40s. Northwest winds up to 5 mph.

Evanston, IL

Today
Rain Showers
75°/ 52° 24°/ 11°
50%
Monday
Mostly Cloudy
72°/ 65° 22°/ 18°
50%
Tuesday
Thunderstorms
82°/ 62° 28°/ 17°
70%
Wednesday
Thunderstorms
72°/ 65° 22°/ 18°
80%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
70%
Friday
Rain Showers
75°/ 60° 24°/ 16°
50%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Scattered showers in the afternoon. Highs in the mid 70s. Temperature falling into the mid 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Lows in the lower 50s. Northwest winds 5 to 10 mph.

Whitewater, WI

Today
Rain Showers
65°/ 45° 18°/
60%
Monday
Partly Cloudy
72°/ 62° 22°/ 17°
70%
Tuesday
Thunderstorms
78°/ 55° 26°/ 13°
70%
Wednesday
Rain Showers
70°/ 60° 21°/ 16°
80%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Friday
Thunderstorms
72°/ 55° 22°/ 13°
50%

Day: Cooler. Partly sunny. Scattered light showers late in the morning, then numerous light showers early in the afternoon. Near steady temperature in the mid 60s. Northwest winds 5 to 10 mph. Chance of showers 60 percent.

Night: Mostly clear. Lows in the mid 40s. West winds up to 5 mph through around midnight becoming calm.

Aurora, IL

Today
Rain Showers
72°/ 48° 22°/
50%
Monday
Mostly Cloudy
75°/ 65° 24°/ 18°
50%
Tuesday
Thunderstorms
82°/ 60° 28°/ 16°
70%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
70%
Friday
Rain Showers
75°/ 58° 24°/ 14°
50%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Scattered showers in the afternoon. Highs in the lower 70s. Temperature falling into the mid 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the upper 40s. Northwest winds around 5 mph in the evening, becoming light and variable.

Racine, WI

Today
Rain Showers
68°/ 52° 20°/ 11°
60%
Monday
Partly Cloudy
70°/ 62° 21°/ 17°
70%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Wednesday
Rain Showers
70°/ 60° 21°/ 16°
70%
Thursday
Thunderstorms
75°/ 60° 24°/ 16°
60%
Friday
Thunderstorms
72°/ 58° 22°/ 14°
50%

Day: Cooler. Partly sunny. Scattered light showers late in the morning, then numerous light showers early in the afternoon. Highs in the upper 60s. Northwest winds 5 to 15 mph. Chance of showers 60 percent.

Night: Clear. Lows in the lower 50s NEAR THE LAKE AND in the upper 40s INLAND. Northwest winds up to 10 mph.

Naperville, IL

Today
Rain Showers
75°/ 52° 24°/ 11°
50%
Monday
Mostly Cloudy
75°/ 65° 24°/ 18°
40%
Tuesday
Thunderstorms
82°/ 62° 28°/ 17°
70%
Wednesday
Thunderstorms
72°/ 65° 22°/ 18°
70%
Thursday
Rain Showers
78°/ 65° 26°/ 18°
70%
Friday
Rain Showers
75°/ 62° 24°/ 17°
50%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Scattered showers in the afternoon. Highs in the mid 70s. Temperature falling into the upper 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Lows in the lower 50s. North winds around 5 mph.

Chicago, IL

Today
Rain Showers
78°/ 55° 26°/ 13°
50%
Monday
Mostly Cloudy
75°/ 68° 24°/ 20°
30%
Tuesday
Thunderstorms
85°/ 65° 29°/ 18°
70%
Wednesday
Thunderstorms
72°/ 68° 22°/ 20°
70%
Thursday
Rain Showers
78°/ 65° 26°/ 18°
70%
Friday
Rain Showers
75°/ 62° 24°/ 17°
50%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Scattered showers in the afternoon. Highs in the upper 70s inland, but only in the lower 70s near the lake. Temperature falling into the upper 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Lows in the mid 50s. North winds 5 to 10 mph.

Belvidere, IL

Today
Rain Showers
68°/ 45° 20°/
70%
Monday
Mostly Cloudy
72°/ 65° 22°/ 18°
70%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
80%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 60° 26°/ 16°
70%
Friday
Rain Showers
75°/ 58° 24°/ 14°
50%

Day: Mostly cloudy. Isolated showers late in the morning, then numerous showers early in the afternoon. Scattered showers late. Highs in the upper 60s. North winds 5 to 10 mph. Chance of precipitation 70 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the mid 40s. Northwest winds around 5 mph in the evening, becoming light and variable.

Milwaukee, WI

Today
Rain Showers
65°/ 50° 18°/ 10°
60%
Monday
Partly Cloudy
70°/ 62° 21°/ 17°
70%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
60%
Wednesday
Rain Showers
70°/ 60° 21°/ 16°
70%
Thursday
Thunderstorms
75°/ 60° 24°/ 16°
60%
Friday
Thunderstorms
72°/ 58° 22°/ 14°
50%

Day: Cooler. Mostly cloudy with scattered light showers late in the morning, then cloudy with numerous light showers early in the afternoon. Mostly sunny late in the afternoon. Near steady temperature in the mid 60s. Northwest winds 5 to 15 mph. Chance of showers 60 percent.

Night: Clear. Lows around 50. Northwest winds up to 10 mph.

DeKalb, IL

Today
Rain Showers
72°/ 45° 22°/
50%
Monday
Mostly Cloudy
75°/ 65° 24°/ 18°
70%
Tuesday
Thunderstorms
82°/ 58° 28°/ 14°
80%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
80°/ 62° 27°/ 17°
70%
Friday
Rain Showers
75°/ 58° 24°/ 14°
50%

Day: Mostly cloudy. Scattered showers in the afternoon. Highs in the lower 70s. Temperature falling into the mid 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the mid 40s. North winds around 5 mph in the evening, becoming light and variable.

Waukesha, WI

Today
Rain Showers
62°/ 48° 17°/
60%
Monday
Partly Cloudy
70°/ 62° 21°/ 17°
80%
Tuesday
Rain Showers
78°/ 55° 26°/ 13°
60%
Wednesday
Rain Showers
68°/ 58° 20°/ 14°
70%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Friday
Thunderstorms
72°/ 55° 22°/ 13°
50%

Day: Cooler. Mostly cloudy with scattered light showers late in the morning, then cloudy with numerous light showers early in the afternoon. Sunny late in the afternoon. Near steady temperature in the lower 60s. Northwest winds 5 to 10 mph. Chance of showers 60 percent.

Night: Clear. Lows in the upper 40s. Northwest winds up to 5 mph.

Janesville, WI

Today
Rain Showers
65°/ 45° 18°/
60%
Monday
Rain Showers
72°/ 65° 22°/ 18°
90%
Tuesday
Thunderstorms
78°/ 55° 26°/ 13°
70%
Wednesday
Rain Showers
70°/ 58° 21°/ 14°
80%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Friday
Thunderstorms
72°/ 55° 22°/ 13°
50%

Day: Cooler. Mostly cloudy with scattered light showers late in the morning, then cloudy with numerous light showers early in the afternoon. Mostly sunny late in the afternoon. Near steady temperature in the mid 60s. Northwest winds 5 to 10 mph. Chance of showers 60 percent.

Night: Mostly clear. Lows in the mid 40s. West winds up to 5 mph through around midnight becoming calm.

Joliet, IL

Today
Rain Showers
78°/ 52° 26°/ 11°
50%
Monday
Mostly Cloudy
75°/ 68° 24°/ 20°
30%
Tuesday
Thunderstorms
85°/ 65° 29°/ 18°
70%
Wednesday
Thunderstorms
75°/ 65° 24°/ 18°
70%
Thursday
Rain Showers
82°/ 65° 28°/ 18°
70%
Friday
Rain Showers
78°/ 62° 26°/ 17°
50%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Isolated showers early in the afternoon. Scattered showers late. Highs in the upper 70s. Temperature falling into the upper 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Patchy fog late. Lows in the lower 50s. North winds around 5 mph.

Watertown, WI

Today
Rain Showers
62°/ 45° 17°/
60%
Monday
Rain Showers
72°/ 62° 22°/ 17°
90%
Tuesday
Rain Showers
78°/ 55° 26°/ 13°
60%
Wednesday
Rain Showers
72°/ 58° 22°/ 14°
70%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Friday
Thunderstorms
72°/ 55° 22°/ 13°
50%

Day: Cooler. Cloudy with scattered light showers late in the morning, then mostly cloudy with numerous light showers early in the afternoon. Sunny late in the afternoon. Near steady temperature in the lower 60s. Northwest winds 5 to 10 mph. Chance of showers 60 percent.

Night: Mostly clear. Lows in the mid 40s. West winds up to 5 mph through around midnight becoming calm.

Oswego, IL

Today
Rain Showers
75°/ 48° 24°/
50%
Monday
Cloudy
75°/ 68° 24°/ 20°
40%
Tuesday
Thunderstorms
85°/ 62° 29°/ 17°
70%
Wednesday
Thunderstorms
75°/ 65° 24°/ 18°
70%
Thursday
Rain Showers
82°/ 65° 28°/ 18°
70%
Friday
Rain Showers
78°/ 62° 26°/ 17°
60%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Scattered showers in the afternoon. Highs in the mid 70s. Temperature falling into the upper 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the upper 40s. North winds around 5 mph in the evening, becoming light and variable.

Calumet City, IL

Today
Rain Showers
78°/ 52° 26°/ 11°
50%
Monday
Cloudy
75°/ 68° 24°/ 20°
20%
Tuesday
Thunderstorms
85°/ 65° 29°/ 18°
70%
Wednesday
Thunderstorms
75°/ 68° 24°/ 20°
70%
Thursday
Rain Showers
82°/ 65° 28°/ 18°
70%
Friday
Rain Showers
78°/ 62° 26°/ 17°
50%

Day: Partly cloudy late in the morning, then becoming mostly cloudy. Isolated showers early in the afternoon. Scattered showers late. Highs in the upper 70s. Temperature falling into the upper 60s in the afternoon. North winds 10 to 15 mph. Chance of precipitation 50 percent.

Night: Mostly clear. Lows in the lower 50s. North winds around 5 mph.

Rockford, IL

Today
Rain Showers
68°/ 45° 20°/
70%
Monday
Rain Showers
72°/ 65° 22°/ 18°
90%
Tuesday
Thunderstorms
78°/ 55° 26°/ 13°
80%
Wednesday
Thunderstorms
72°/ 60° 22°/ 16°
80%
Thursday
Rain Showers
78°/ 58° 26°/ 14°
70%
Friday
Rain Showers
75°/ 55° 24°/ 13°
50%

Day: Mostly cloudy. Scattered showers late in the morning, then numerous showers early in the afternoon. Scattered showers late. Not as warm. Highs in the upper 60s. Northwest winds 5 to 10 mph. Chance of precipitation 70 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the mid 40s. Northwest winds around 5 mph in the evening, becoming light and variable.

Rochelle, IL

Today
Rain Showers
70°/ 45° 21°/
60%
Monday
Mostly Cloudy
75°/ 65° 24°/ 18°
70%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
80%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 60° 26°/ 16°
70%
Friday
Rain Showers
75°/ 58° 24°/ 14°
50%

Day: Mostly cloudy. Isolated showers late in the morning, then numerous showers early in the afternoon. Scattered showers late. Highs around 70. North winds 5 to 10 mph. Chance of precipitation 60 percent.

Night: Mostly clear. Patchy fog after midnight. Lows in the mid 40s. Northwest winds around 5 mph in the evening, becoming light and variable.

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