Brown Park, IL Weather Forecast & Current Conditions

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Brown Park Weather Map
UTC Time: 9/20/2026, 01:11
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Brown Park, IL Regional Weather

Expires:202609200200;;738818
ASUS43 KLOT 200110
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
800 PM CDT SAT SEP 19 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.


ILZ003-004-008-010-011-017-018-200200-
NORTH CENTRAL ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
ROCKFORD       LGT RAIN  67  66  97 E3        29.95S FOG     TC  19   
FREEPORT*      CLOUDY    67  65  94 E7        29.94F TC  20           
ROCHELLE*      RAIN      67  67 100 E3        29.95S TC  20           
DE KALB*       HVY RAIN  67  67 100 SE6       29.96S TC  20           
PERU*          RAIN      72  70  94 N3        29.97R 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

Brown Park, IL

Tonight
Thunderstorms
62°17°
100%
Sunday
Rain Showers
65°/ 52° 18°/ 11°
70%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
62°/ 48° 17°/
20%
Wednesday
Mostly Cloudy
62°/ 48° 17°/
0%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
68°/ 50° 20°/ 10°
0%
Saturday
Cloudy
70°21°
0%

Night: A chance of thunderstorms until early morning. Showers. A slight chance of thunderstorms late. Some thunderstorms may produce heavy rainfall until early morning. Some thunderstorms may produce heavy rainfall late. Lows in the lower 60s. Northeast winds 5 to 10 mph. Chance of precipitation near 100 percent.

Belvidere, IL

Tonight
Thunderstorms
62°17°
100%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
62°/ 48° 17°/
20%
Wednesday
Mostly Cloudy
62°/ 50° 17°/ 10°
0%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
70°/ 52° 21°/ 11°
0%
Saturday
Cloudy
72°22°
0%

Night: A chance of thunderstorms until early morning. Showers. A slight chance of thunderstorms late. Some thunderstorms may produce heavy rainfall until early morning. Some thunderstorms may produce heavy rainfall late. Lows in the lower 60s. East winds 5 to 10 mph. Chance of precipitation near 100 percent.

Rochelle, IL

Tonight
Thunderstorms
62°17°
100%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
62°/ 48° 17°/
60%
Tuesday
Rain Showers
62°/ 48° 17°/
20%
Wednesday
Mostly Cloudy
65°/ 48° 18°/
0%
Thursday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Friday
Mostly Cloudy
70°/ 52° 21°/ 11°
0%
Saturday
Cloudy
72°22°
0%

Night: Showers and a chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Lows in the lower 60s. East winds around 5 mph, becoming northeast after midnight. Chance of precipitation near 100 percent.

DeKalb, IL

Tonight
Thunderstorms
62°17°
100%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
80%
Monday
Rain Showers
65°/ 52° 18°/ 11°
50%
Tuesday
Rain Showers
62°/ 50° 17°/ 10°
30%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Friday
Mostly Cloudy
72°/ 52° 22°/ 11°
0%
Saturday
Cloudy
72°22°
0%

Night: Showers and a chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Lows in the lower 60s. East winds around 5 mph, becoming north after midnight. Chance of precipitation near 100 percent.

Janesville, WI

Late Afternoon
Thunderstorms
62°17°
90%
Sunday
Rain Showers
65°/ 52° 18°/ 11°
60%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
60°/ 48° 16°/
20%
Wednesday
Partly Cloudy
62°/ 48° 17°/
0%
Thursday
Partly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Saturday
Partly Cloudy
70°21°
0%

Day: Cloudy with scattered showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds around 5 mph. Chance of precipitation 50 percent.

Night: Scattered showers in the evening. Chance of thunderstorms until early morning. Showers in the late evening and overnight. Some thunderstorms may produce heavy rainfall until early morning. Lows in the lower 60s. Northeast winds 5 to 15 mph. Chance of precipitation 90 percent.

Freeport, IL

Tonight
Thunderstorms
62°17°
100%
Sunday
Thunderstorms
65°/ 52° 18°/ 11°
50%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
62°/ 48° 17°/
50%
Wednesday
Mostly Cloudy
65°18°
0%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%

Night: Showers. Thunderstorms likely, mainly this evening. Patchy fog after midnight. Some thunderstorms may produce heavy rainfall this evening. Some thunderstorms may produce heavy rainfall after midnight. Lows in the lower 60s. East winds around 5 mph, becoming northeast 10 to 15 mph after midnight. Chance of rain near 100 percent.

Crystal Lake, IL

Tonight
Thunderstorms
65°18°
100%
Sunday
Rain Showers
62°/ 55° 17°/ 13°
70%
Monday
Rain Showers
62°/ 50° 17°/ 10°
50%
Tuesday
Rain Showers
62°/ 50° 17°/ 10°
20%
Wednesday
Mostly Cloudy
62°/ 52° 17°/ 11°
0%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
70°/ 52° 21°/ 11°
0%
Saturday
Cloudy
72°22°
0%

Night: A chance of thunderstorms until early morning. Showers. A slight chance of thunderstorms late. Some thunderstorms may produce heavy rainfall until early morning. Some thunderstorms may produce heavy rainfall late. Near steady temperature in the mid 60s. Northeast winds 5 to 10 mph. Chance of precipitation near 100 percent.

Whitewater, WI

Late Afternoon
Thunderstorms
62°17°
100%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
60°/ 48° 16°/
30%
Wednesday
Partly Cloudy
62°/ 50° 17°/ 10°
0%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Saturday
Partly Cloudy
70°21°
0%

Day: Showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds around 5 mph. Chance of precipitation near 100 percent.

Night: Scattered showers in the evening. Chance of thunderstorms until early morning. Showers in the late evening and overnight. Some thunderstorms may produce heavy rainfall until early morning. Lows in the lower 60s. Northeast winds up to 10 mph. Chance of precipitation near 100 percent.

Monroe, WI

Late Afternoon
Thunderstorms
60°16°
90%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
50%
Monday
Rain Showers
62°/ 50° 17°/ 10°
50%
Tuesday
Rain Showers
62°/ 48° 17°/
30%
Wednesday
Partly Cloudy
65°/ 50° 18°/ 10°
0%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Partly Cloudy
70°/ 52° 21°/ 11°
0%
Saturday
Partly Cloudy
72°22°
0%

Day: Cloudy with scattered showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds up to 5 mph. Chance of precipitation 50 percent.

Night: Scattered rain showers in the evening. Chance of thunderstorms until early morning. Rain showers in the late evening and overnight. Some thunderstorms may produce heavy rainfall until early morning. Lows around 60. Northeast winds 5 to 15 mph. Chance of precipitation 90 percent.

Dixon, IL

Tonight
Thunderstorms
65°18°
100%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
65°/ 52° 18°/ 11°
60%
Tuesday
Rain Showers
62°/ 50° 17°/ 10°
30%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Friday
Mostly Cloudy
72°/ 52° 22°/ 11°
0%
Saturday
Cloudy
72°22°
0%

Night: Showers and a chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Lows in the mid 60s. Southeast winds around 5 mph, becoming northwest after midnight. Chance of precipitation near 100 percent.

Aurora, IL

Tonight
Thunderstorms
68°20°
100%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
80%
Monday
Rain Showers
65°/ 52° 18°/ 11°
50%
Tuesday
Rain Showers
62°/ 52° 17°/ 11°
30%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Friday
Mostly Cloudy
72°/ 52° 22°/ 11°
0%
Saturday
Cloudy
72°22°
0%

Night: Showers and a chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Near steady temperature in the upper 60s. East winds around 5 mph, becoming north after midnight. Chance of precipitation near 100 percent.

Mount Carroll, IL

Tonight
Thunderstorms
62°17°
90%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
62°/ 50° 17°/ 10°
60%
Tuesday
Mostly Cloudy
62°/ 48° 17°/
0%
Wednesday
Partly Cloudy
65°/ 50° 18°/ 10°
0%
Thursday
Mostly Cloudy
68°20°
0%
Friday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%

Night: Showers with thunderstorms likely. Patchy fog after midnight. Some thunderstorms may produce heavy rainfall. Lows in the lower 60s. East winds around 5 mph, becoming north after midnight. Chance of rain 90 percent.

Kenosha, WI

Late Afternoon
Thunderstorms
62°17°
100%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
70%
Monday
Cloudy
62°/ 52° 17°/ 11°
30%
Tuesday
Rain Showers
62°/ 52° 17°/ 11°
20%
Wednesday
Rain Showers
62°/ 52° 17°/ 11°
20%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Saturday
Sunny
70°21°
0%

Day: Showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds 5 to 10 mph. Chance of precipitation 80 percent.

Night: Scattered showers and chance of thunderstorms in the evening, then showers and chance of thunderstorms in the late evening and overnight. Some thunderstorms may produce heavy rainfall. Lows in the lower 60s. Northeast winds 5 to 10 mph. Chance of precipitation near 100 percent.

Madison, WI

Late Afternoon
Thunderstorms
58°14°
70%
Sunday
Rain Showers
65°/ 52° 18°/ 11°
50%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
62°/ 48° 17°/
20%
Wednesday
Partly Cloudy
65°/ 48° 18°/
0%
Thursday
Rain Showers
68°/ 52° 20°/ 11°
20%
Friday
Mostly Cloudy
72°/ 52° 22°/ 11°
0%
Saturday
Partly Cloudy
72°22°
0%

Day: Cloudy with scattered showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds around 5 mph. Chance of precipitation 50 percent.

Night: Cloudy. Numerous rain showers and chance of thunderstorms until early morning, then numerous rain showers early in the morning. Some thunderstorms may produce heavy rainfall until early morning. Lows in the upper 50s. Northeast winds 5 to 15 mph. Chance of precipitation 70 percent.

Darlington, WI

Late Afternoon
Thunderstorms
60°16°
70%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
50%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
62°/ 48° 17°/
30%
Wednesday
Partly Cloudy
65°/ 50° 18°/ 10°
0%
Thursday
Partly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Partly Cloudy
70°/ 52° 21°/ 11°
0%
Saturday
Partly Cloudy
70°21°
0%

Day: Cloudy with scattered showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds up to 5 mph. Chance of precipitation 40 percent.

Night: Scattered rain showers in the evening. Chance of thunderstorms until early morning. Numerous rain showers in the late evening and overnight. Some thunderstorms may produce heavy rainfall until early morning. Lows around 60. Northeast winds 5 to 15 mph. Chance of precipitation 70 percent.

Watertown, WI

Late Afternoon
Thunderstorms
60°16°
100%
Sunday
Rain Showers
65°/ 52° 18°/ 11°
50%
Monday
Rain Showers
62°/ 48° 17°/
40%
Tuesday
Rain Showers
62°/ 48° 17°/
20%
Wednesday
Partly Cloudy
62°/ 48° 17°/
0%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
0%
Friday
Mostly Cloudy
72°/ 50° 22°/ 10°
0%
Saturday
Partly Cloudy
72°22°
0%

Day: Showers and chance of thunderstorms. Some thunderstorms may produce heavy rainfall. East winds around 5 mph. Chance of precipitation near 100 percent.

Night: Showers and chance of thunderstorms until early morning, then numerous showers early in the morning. Some thunderstorms may produce heavy rainfall until early morning. Lows around 60. Northeast winds 5 to 15 mph. Chance of precipitation 90 percent.

Galena, IL

Tonight
Thunderstorms
62°17°
90%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
50%
Monday
Rain Showers
62°/ 50° 17°/ 10°
50%
Tuesday
Rain Showers
62°/ 48° 17°/
50%
Wednesday
Partly Cloudy
65°/ 50° 18°/ 10°
0%
Thursday
Mostly Cloudy
68°20°
0%
Friday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%

Night: Showers. Thunderstorms likely, mainly this evening. Patchy fog after midnight. Some thunderstorms may produce heavy rainfall this evening. Some thunderstorms may produce heavy rainfall after midnight. Lows in the lower 60s. East winds around 5 mph, increasing to northeast 10 to 15 mph after midnight. Chance of rain 90 percent.

Sterling, IL

Tonight
Thunderstorms
65°18°
100%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
65°/ 52° 18°/ 11°
70%
Tuesday
Mostly Cloudy
65°18°
0%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
68°20°
0%
Friday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%

Night: Showers with thunderstorms likely. Patchy fog after midnight. Some thunderstorms may produce heavy rainfall. Lows in the mid 60s. East winds around 5 mph, becoming northwest after midnight. Chance of rain near 100 percent.

Evanston, IL

Tonight
Thunderstorms
68°20°
100%
Sunday
Thunderstorms
65°/ 55° 18°/ 13°
80%
Monday
Rain Showers
65°/ 52° 18°/ 11°
40%
Tuesday
Rain Showers
62°/ 52° 17°/ 11°
20%
Wednesday
Rain Showers
62°/ 55° 17°/ 13°
20%
Thursday
Mostly Cloudy
65°/ 55° 18°/ 13°
0%
Friday
Mostly Cloudy
70°/ 55° 21°/ 13°
0%
Saturday
Cloudy
72°22°
0%

Night: Showers and a chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Near steady temperature in the upper 60s. East winds 5 to 10 mph. Chance of precipitation near 100 percent.

Waukegan, IL

Tonight
Thunderstorms
65°18°
100%
Sunday
Rain Showers
65°/ 55° 18°/ 13°
70%
Monday
Rain Showers
65°/ 52° 18°/ 11°
40%
Tuesday
Rain Showers
62°/ 52° 17°/ 11°
20%
Wednesday
Rain Showers
62°/ 52° 17°/ 11°
20%
Thursday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Friday
Mostly Cloudy
68°/ 55° 20°/ 13°
0%
Saturday
Cloudy
72°22°
0%

Night: A chance of thunderstorms until early morning. Showers. A slight chance of thunderstorms late. Some thunderstorms may produce heavy rainfall until early morning. Some thunderstorms may produce heavy rainfall late. Near steady temperature in the mid 60s. East winds around 5 mph, increasing to north 10 to 15 mph after midnight. Chance of precipitation near 100 percent.

Names listed above may include county names.

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