Williamson, IL Weather Forecast & Current Conditions

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Williamson, IL Weather Maps

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Williamson Weather Map
UTC Time: 11/1/2026, 11:47
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Williamson, IL Regional Weather

Expires:202611011200;;074413
ASUS43 KLOT 011110
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
500 AM CST SUN NOV 01 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.


ILZ079-100>102-011200-
SOUTHWEST ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
ALTON          CLOUDY    60  55  81 E5        30.27R TC  16           
CAHOKIA*       CLOUDY    61  56  83 SE5       30.25R TC  16           
SPARTA*        LGT RAIN  58  58  99 SE5       30.26R TC  15           
$$


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

Williamson, IL

Tonight
Rain
60°16°
50%
Sunday
Rain
60°/ 58° 16°/ 14°
50%
Monday
Cloudy
72°/ 62° 22°/ 17°
40%
Tuesday
Thunderstorms
72°/ 55° 22°/ 13°
90%
Wednesday
Rain
68°/ 48° 20°/ 9°
50%
Thursday
Partly Cloudy
68°/ 48° 20°/ 9°
20%
Fri-Fri Night
Mostly Cloudy
65°18°
0%
Saturday
Sunny
65°18°
0%

Night: Cloudy with a 50 percent chance of rain. Near steady temperature around 60. Southeast winds around 5 mph.

Greene County, IL

Tonight
Rain
58°14°
40%
Sunday
Rain
62°/ 58° 17°/ 14°
40%
Monday
Mostly Cloudy
72°/ 58° 22°/ 14°
50%
Tuesday
Thunderstorms
72°/ 52° 22°/ 11°
100%
Wednesday
Rain
65°/ 45° 18°/ 7°
50%
Thursday
Mostly Cloudy
65°18°
0%
Fri Night
Mostly Cloudy
65°18°
0%
Saturday
Sunny
65°18°
0%

Night: Cloudy with a 40 percent chance of rain. Near steady temperature in the upper 50s. Southeast winds around 5 mph.

Litchfield, IL

Tonight
Rain
58°14°
40%
Sunday
Rain
62°/ 55° 17°/ 13°
50%
Monday
Rain
68°/ 58° 20°/ 14°
20%
Tuesday
Thunderstorms
72°/ 55° 22°/ 13°
80%
Wednesday
Rain
68°/ 45° 20°/ 7°
50%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Night: Cloudy with a 40 percent chance of rain. Near steady temperature in the upper 50s. Southeast winds around 5 mph.

Centralia, IL

Tonight
Rain
60°16°
50%
Sunday
Rain
60°/ 55° 16°/ 13°
50%
Monday
Cloudy
70°/ 58° 21°/ 14°
0%
Tuesday
Rain
75°/ 55° 24°/ 13°
70%
Wednesday
Rain
68°/ 48° 20°/ 9°
50%
Thursday
Partly Cloudy
68°/ 48° 20°/ 9°
20%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Night: Cloudy with a 50 percent chance of rain. Near steady temperature around 60. Southeast winds around 5 mph.

Alton, MO

Tonight
Rain
60°16°
50%
Sunday
Rain
60°/ 58° 16°/ 14°
50%
Monday
Cloudy
72°/ 62° 22°/ 17°
40%
Tuesday
Thunderstorms
72°/ 55° 22°/ 13°
90%
Wednesday
Rain
68°/ 48° 20°/ 9°
50%
Thursday
Partly Cloudy
68°/ 48° 20°/ 9°
20%
Fri-Fri Night
Mostly Cloudy
65°18°
0%
Saturday
Sunny
65°18°
0%

Night: Cloudy with a 50 percent chance of rain. Near steady temperature around 60. Southeast winds around 5 mph.

Alton, IL

Tonight
Rain
60°16°
50%
Sunday
Rain
60°/ 58° 16°/ 14°
50%
Monday
Cloudy
72°/ 62° 22°/ 17°
40%
Tuesday
Thunderstorms
72°/ 55° 22°/ 13°
90%
Wednesday
Rain
68°/ 48° 20°/ 9°
50%
Thursday
Partly Cloudy
68°/ 48° 20°/ 9°
20%
Fri-Fri Night
Mostly Cloudy
65°18°
0%
Saturday
Sunny
65°18°
0%

Night: Cloudy with a 50 percent chance of rain. Near steady temperature around 60. Southeast winds around 5 mph.

Taylorville, IL

Today
Rain
62°/ 55° 17°/ 13°
40%
Monday
Rain
68°/ 58° 20°/ 14°
20%
Tuesday
Rain
72°/ 55° 22°/ 13°
80%
Wednesday
Rain
68°/ 48° 20°/ 9°
50%
Thursday
Mostly Cloudy
48°9°
0%
Friday
Mostly Cloudy
48°/ 42° 9°/ 6°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the lower 60s. Southeast winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 40 percent.

Night: Cloudy. A chance of rain after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast winds around 10 mph with gusts up to 20 mph. Chance of rain 30 percent.

Springfield, IL

Today
Rain
65°/ 55° 18°/ 13°
40%
Monday
Rain
70°/ 60° 21°/ 16°
20%
Tuesday
Rain
75°/ 55° 24°/ 13°
90%
Wednesday
Rain
68°/ 48° 20°/ 9°
50%
Thursday
Mostly Cloudy
48°9°
0%
Friday
Mostly Cloudy
48°/ 42° 9°/ 6°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the mid 60s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 40 percent.

Night: Cloudy. A slight chance of rain after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast winds around 10 mph with gusts up to 20 mph. Chance of rain 20 percent.

Shelbyville, IL

Today
Rain
65°/ 55° 18°/ 13°
40%
Monday
Rain
68°/ 62° 20°/ 17°
40%
Tuesday
Rain
72°/ 55° 22°/ 13°
80%
Wednesday
Rain
68°/ 48° 20°/ 9°
70%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the mid 60s. Southeast winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 40 percent.

Night: Cloudy. A slight chance of rain in the evening, then a chance of rain after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 30 percent.

Jacksonville, IL

Today
Rain
62°/ 55° 17°/ 13°
30%
Monday
Rain
72°/ 60° 22°/ 16°
40%
Tuesday
Rain
72°/ 52° 22°/ 11°
90%
Wednesday
Rain
65°/ 45° 18°/ 7°
40%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the lower 60s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 30 percent.

Night: Cloudy. A slight chance of rain after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent.

Monroe County, IL

Tonight
Rain
60°16°
60%
Sunday
Rain
58°/ 58° 14°/ 14°
50%
Monday
Cloudy
72°/ 58° 22°/ 14°
20%
Tuesday
Thunderstorms
72°/ 52° 22°/ 11°
90%
Wednesday
Rain
68°/ 45° 20°/ 7°
50%
Thursday
Partly Cloudy
68°/ 45° 20°/ 7°
20%
Fri-Fri Night
Mostly Cloudy
65°18°
0%
Saturday
Sunny
68°20°
0%

Night: Rain likely. Near steady temperature around 60. Southeast winds around 5 mph. Chance of rain 60 percent.

Winchester, IL

Today
Rain
62°/ 55° 17°/ 13°
30%
Monday
Mostly Cloudy
72°/ 60° 22°/ 16°
40%
Tuesday
Rain
72°/ 52° 22°/ 11°
90%
Wednesday
Rain
68°/ 45° 20°/ 7°
30%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the lower 60s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 30 percent.

Night: Cloudy. Patchy fog after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph with gusts up to 20 mph.

Jefferson County, MO

Tonight
Rain
60°16°
60%
Sunday
Rain
58°/ 58° 14°/ 14°
50%
Monday
Cloudy
72°/ 58° 22°/ 14°
20%
Tuesday
Thunderstorms
72°/ 52° 22°/ 11°
90%
Wednesday
Rain
68°/ 45° 20°/ 7°
50%
Thursday
Partly Cloudy
68°/ 45° 20°/ 7°
20%
Fri-Fri Night
Mostly Cloudy
65°18°
0%
Saturday
Sunny
68°20°
0%

Night: Rain likely. Near steady temperature around 60. Southeast winds around 5 mph. Chance of rain 60 percent.

Mount Vernon, IL

Today
Rain Showers
65°/ 52° 18°/ 11°
50%
Monday
Cloudy
72°/ 58° 22°/ 14°
0%
Tuesday
Rain Showers
75°/ 55° 24°/ 13°
70%
Wednesday
Rain Showers
70°/ 48° 21°/ 9°
50%
Thursday
Mostly Cloudy
68°20°
0%
Friday
Mostly Cloudy
68°20°
0%
Saturday
Mostly Cloudy
68°20°
0%

Day: Cloudy. A chance of showers, mainly this morning. Highs in the mid 60s. Southeast winds 5 to 10 mph. Chance of rain 50 percent.

Night: Cloudy. Lows in the lower 50s. Southeast winds 5 to 10 mph.

Chester, IL

Tonight
Rain
60°16°
70%
Sunday
Rain
58°/ 58° 14°/ 14°
50%
Monday
Cloudy
72°/ 58° 22°/ 14°
20%
Tuesday
Thunderstorms
72°/ 52° 22°/ 11°
80%
Wednesday
Rain
68°/ 45° 20°/ 7°
50%
Thursday
Partly Cloudy
68°/ 45° 20°/ 7°
20%
Friday
Partly Cloudy
68°/ 42° 20°/ 6°
0%
Saturday
Partly Cloudy
68°20°
0%

Night: Rain likely. Patchy fog. Near steady temperature around 60. Southeast winds 5 to 10 mph. Chance of rain 70 percent.

Effingham, IL

Today
Rain
65°/ 55° 18°/ 13°
50%
Monday
Rain
68°/ 58° 20°/ 14°
30%
Tuesday
Rain
75°/ 55° 24°/ 13°
80%
Wednesday
Rain
68°/ 48° 20°/ 9°
70%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the mid 60s. Southeast winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 50 percent.

Night: Cloudy. A slight chance of rain in the evening, then a chance of rain after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 30 percent.

Quincy, IL

Tonight
Rain
55°13°
20%
Sunday
Rain
62°/ 58° 17°/ 14°
20%
Monday
Mostly Cloudy
72°/ 62° 22°/ 17°
100%
Tuesday
Thunderstorms
72°/ 50° 22°/ 10°
100%
Wednesday
Rain
65°/ 45° 18°/ 7°
40%
Thursday
Mostly Cloudy
65°18°
0%
Friday
Mostly Cloudy
65°18°
0%
Saturday
Mostly Cloudy
65°18°
0%

Night: Mostly cloudy with a 20 percent chance of rain. Near steady temperature in the mid 50s. Southeast winds around 5 mph.

Pinckneyville, IL

Today
Rain Showers
65°/ 52° 18°/ 11°
50%
Monday
Cloudy
72°/ 58° 22°/ 14°
0%
Tuesday
Rain Showers
75°/ 55° 24°/ 13°
70%
Wednesday
Rain Showers
70°/ 48° 21°/ 9°
50%
Thursday
Mostly Cloudy
68°20°
0%
Friday
Mostly Cloudy
68°20°
0%
Saturday
Mostly Cloudy
68°20°
0%

Day: Cloudy. A chance of showers, mainly this morning. Highs in the mid 60s. Southeast winds 5 to 10 mph. Chance of rain 50 percent.

Night: Cloudy. Lows in the lower 50s. Southeast winds 5 to 10 mph.

Decatur, IL

Today
Rain
65°/ 55° 18°/ 13°
40%
Monday
Rain
68°/ 58° 20°/ 14°
30%
Tuesday
Rain
72°/ 55° 22°/ 13°
80%
Wednesday
Rain
68°/ 45° 20°/ 7°
60%
Thursday
Mostly Cloudy
45°7°
0%
Friday
Mostly Cloudy
45°7°
0%
Saturday
Mostly Cloudy
45°7°
0%

Day: Cloudy. A chance of rain, mainly this morning. Highs in the mid 60s. Southeast winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 40 percent.

Night: Cloudy. A slight chance of rain after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast winds around 10 mph with gusts up to 20 mph. Chance of rain 20 percent.

Washington, MO

Tonight
Rain
60°16°
60%
Sunday
Rain
60°/ 58° 16°/ 14°
50%
Monday
Mostly Cloudy
72°/ 58° 22°/ 14°
50%
Tuesday
Thunderstorms
72°/ 48° 22°/ 9°
100%
Wednesday
Rain
65°/ 45° 18°/ 7°
20%
Thursday
Partly Cloudy
65°/ 45° 18°/ 7°
20%
Friday
Partly Cloudy
65°/ 42° 18°/ 6°
0%

Night: Rain likely. Patchy fog. Near steady temperature around 60. Southeast winds around 5 mph. Chance of rain 60 percent.

Names listed above may include county names.

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