Alta, IL Weather Forecast & Current Conditions

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Alta Weather Map
UTC Time: 9/17/2026, 14:17
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Alta, IL Regional Weather

Expires:202609171500;;603733
ASUS43 KLOT 171406
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
900 AM CDT THU SEP 17 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.


ILZ028>032-037-038-041>044-048-051>054-059>061-171500-
CENTRAL ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
PONTIAC        CLOUDY    71  71 100 NE13      30.26R FOG     TC  21   
BLOOMINGTON    MOSUNNY   79  73  82 W6        30.24R HX  82  TC  26   
DECATUR        SUNNY     83  70  64 SW10      30.23S HX  87  TC  28   
PEORIA         MOSUNNY   76  72  87 NE7       30.23R TC  24           
LACON*         CLOUDY    70  68  94 S3        30.25R THUNDER TC  21   
LINCOLN*       SUNNY     82  73  75 SW3       30.22S HX  87  TC  28   
SPRINGFIELD    SUNNY     82  71  69 SW10      30.21S HX  86  TC  28   
TAYLORVILLE    NOT AVBL                                               
$$


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

Alta, IL

Today
Thunderstorms
85°/ 65° 29°/ 18°
20%
Friday
Thunderstorms
82°/ 68° 28°/ 20°
50%
Saturday
Mostly Cloudy
88°/ 68° 31°/ 20°
70%
Sun Night
Thunderstorms
62°17°
60%
Monday
Rain Showers
70°/ 58° 21°/ 14°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Mostly cloudy this morning, then becoming partly sunny. A slight chance of showers and thunderstorms this morning. Patchy fog this morning. Highs in the mid 80s. East winds around 5 mph, becoming west this afternoon. Chance of rain 20 percent.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 60s. Northeast winds around 5 mph. Chance of rain 20 percent.

Eureka, IL

Today
Thunderstorms
85°/ 65° 29°/ 18°
40%
Friday
Rain Showers
82°/ 68° 28°/ 20°
40%
Saturday
Mostly Cloudy
88°/ 68° 31°/ 20°
70%
Sun Night-Mon
Thunderstorms
60°16°
60%
Mon Night-Tue
Mostly Cloudy
55°13°
0%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Patchy fog this morning. Mostly cloudy with a chance of showers with a slight chance of thunderstorms this morning, then partly sunny this afternoon. Highs in the mid 80s. Northeast winds around 5 mph, becoming northwest this afternoon. Chance of rain 40 percent.

Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Humid with lows in the mid 60s. Northeast winds around 5 mph. Chance of rain 30 percent.

Pekin, IL

Today
Thunderstorms
88°/ 68° 31°/ 20°
20%
Friday
Thunderstorms
85°/ 68° 29°/ 20°
40%
Saturday
Mostly Cloudy
90°/ 68° 32°/ 20°
70%
Sunday
Thunderstorms
78°26°
50%
Sun Night-Mon
Thunderstorms
62°17°
60%
Mon Night
Rain Showers
58°14°
40%
Tuesday
Partly Cloudy
72°/ 55° 22°/ 13°
0%

Day: Partly sunny. A slight chance of showers and thunderstorms this morning. Patchy fog this morning. Highs in the upper 80s. Northeast winds around 5 mph, becoming west this afternoon. Chance of rain 20 percent.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent.

Lacon, IL

Today
Thunderstorms
85°/ 65° 29°/ 18°
50%
Friday
Rain Showers
80°/ 68° 27°/ 20°
40%
Saturday
Rain Showers
88°/ 68° 31°/ 20°
70%
Sun Night
Thunderstorms
58°14°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Mostly cloudy. A chance of showers with a slight chance of thunderstorms this morning. Patchy fog this morning. Some thunderstorms may produce heavy rainfall this morning. Highs in the mid 80s. East winds around 5 mph, becoming northwest around 5 mph this afternoon. Chance of rain 50 percent.

Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 60s. Northeast winds around 5 mph. Chance of rain 30 percent.

Toulon, IL

Today
Thunderstorms
82°/ 65° 28°/ 18°
40%
Friday
Rain Showers
78°/ 68° 26°/ 20°
50%
Saturday
Rain Showers
85°/ 65° 29°/ 18°
70%
Sun Night
Thunderstorms
58°14°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Mostly cloudy. A chance of showers with a slight chance of thunderstorms this morning. Patchy fog this morning. Some thunderstorms may produce heavy rainfall this morning. Highs in the lower 80s. East winds around 5 mph, becoming northwest around 5 mph this afternoon. Chance of rain 40 percent.

Night: Mostly cloudy. A chance of showers after midnight. Lows in the mid 60s. Northeast winds around 5 mph. Chance of rain 30 percent.

Galesburg, IL

Today
Thunderstorms
82°/ 65° 28°/ 18°
20%
Friday
Thunderstorms
82°/ 68° 28°/ 20°
50%
Saturday
Mostly Cloudy
88°/ 65° 31°/ 18°
70%
Sun Night
Thunderstorms
60°16°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Patchy fog this morning. Mostly cloudy with a slight chance of showers and thunderstorms this morning, then partly sunny this afternoon. Some thunderstorms may produce heavy rainfall this morning. Highs in the lower 80s. East winds around 5 mph, becoming west around 5 mph this afternoon. Chance of rain 20 percent.

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 60s. Northeast winds around 5 mph. Chance of rain 20 percent.

Canton, IL

Today
Partly Cloudy
88°/ 68° 31°/ 20°
20%
Friday
Thunderstorms
85°/ 68° 29°/ 20°
30%
Saturday
Mostly Cloudy
88°/ 68° 31°/ 20°
70%
Sunday
Thunderstorms
78°/ 62° 26°/ 17°
60%
Monday
Rain Showers
70°/ 58° 21°/ 14°
60%
Tuesday
Partly Cloudy
70°/ 55° 21°/ 13°
0%

Day: Patchy fog this morning. Partly sunny. Highs in the upper 80s. East winds around 5 mph, becoming southwest around 5 mph this afternoon. Heat index values up to 100 this afternoon.

Night: Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds around 5 mph. Chance of rain 20 percent.

Princeton, IL

Today
Thunderstorms
80°/ 65° 27°/ 18°
70%
Friday
Rain Showers
78°/ 65° 26°/ 18°
50%
Saturday
Rain Showers
85°/ 65° 29°/ 18°
70%
Sun Night
Thunderstorms
58°14°
50%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Showers likely with a chance of thunderstorms early this morning. Patchy fog early this morning. Some thunderstorms may produce heavy rainfall early this morning. Locally heavy rainfall possible early this morning. Humid with highs around 80. Southeast winds around 5 mph, becoming northwest this afternoon. Chance of rain 70 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Humid with lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent.

Hennepin, IL

Today
Thunderstorms
82°/ 65° 28°/ 18°
70%
Friday
Rain Showers
78°/ 68° 26°/ 20°
50%
Saturday
Rain Showers
88°/ 68° 31°/ 20°
70%
Sun Night
Thunderstorms
58°14°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Showers likely with a chance of thunderstorms early this morning. Patchy fog early this morning. Some thunderstorms may produce heavy rainfall early this morning. Humid with highs in the lower 80s. East winds around 5 mph, becoming northwest around 5 mph this afternoon. Chance of rain 70 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Humid with lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent.

Havana, IL

Today
Partly Cloudy
90°/ 68° 32°/ 20°
20%
Friday
Thunderstorms
88°/ 68° 31°/ 20°
30%
Saturday
Partly Cloudy
92°/ 68° 33°/ 20°
60%
Sunday
Rain Showers
82°/ 62° 28°/ 17°
60%
Monday
Rain Showers
72°/ 58° 22°/ 14°
60%
Tuesday
Partly Cloudy
72°/ 55° 22°/ 13°
0%
Wednesday
Sunny
75°24°
0%

Day: Patchy fog this morning. Partly sunny. Highs around 90. East winds around 5 mph, becoming southwest around 5 mph this afternoon. Heat index values up to 100 this afternoon.

Night: Mostly clear in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds around 5 mph. Chance of rain 20 percent.

Bloomington, IL

Today
Thunderstorms
88°/ 68° 31°/ 20°
40%
Friday
Thunderstorms
82°/ 68° 28°/ 20°
40%
Saturday
Mostly Cloudy
90°/ 68° 32°/ 20°
70%
Sunday
Rain Showers
80°/ 62° 27°/ 17°
50%
Monday
Thunderstorms
72°/ 55° 22°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Mostly cloudy this morning, then becoming partly sunny. A slight chance of showers and thunderstorms this morning. Patchy fog this morning. Highs in the upper 80s. Northeast winds 5 to 10 mph, becoming west this afternoon. Chance of rain 20 percent.

Night: Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 40 percent.

Geneseo, IL

Today
Thunderstorms
80°/ 65° 27°/ 18°
70%
Friday
Rain Showers
78°/ 68° 26°/ 20°
50%
Saturday
Rain Showers
85°/ 65° 29°/ 18°
70%
Sun Night
Thunderstorms
58°14°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Showers likely with a chance of thunderstorms early, then a chance of showers and thunderstorms this morning. Patchy fog early this morning. Some thunderstorms may produce heavy rainfall early this morning. Locally heavy rainfall possible early. Humid with highs around 80. East winds around 5 mph, becoming northwest this afternoon. Chance of rain 70 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Humid with lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent.

Ottawa, IL

Today
Thunderstorms
82°/ 65° 28°/ 18°
70%
Friday
Rain Showers
78°/ 65° 26°/ 18°
50%
Saturday
Thunderstorms
85°/ 65° 29°/ 18°
70%
Sunday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tuesday
Mostly Cloudy
70°/ 55° 21°/ 13°
0%
Wednesday
Cloudy
75°24°
0%

Day: Mostly cloudy. Patchy fog early in the morning. Showers likely early in the morning. A chance of thunderstorms in the morning. A chance of showers late in the morning. Highs in the lower 80s. South winds around 5 mph, becoming northwest in the afternoon. Chance of precipitation 70 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of precipitation 20 percent.

Lincoln, IL

Today
Partly Cloudy
92°/ 68° 33°/ 20°
30%
Friday
Thunderstorms
88°/ 68° 31°/ 20°
30%
Saturday
Partly Cloudy
92°/ 68° 33°/ 20°
50%
Sunday
Rain Showers
82°/ 62° 28°/ 17°
50%
Monday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Tuesday
Cloudy
75°24°
0%
Wednesday
Cloudy
75°24°
0%

Day: Patchy fog this morning. Partly sunny. Highs in the lower 90s. Northeast winds 5 to 10 mph, becoming southwest this afternoon. Heat index values up to 101.

Night: Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 30 percent.

Pontiac, IL

Today
Thunderstorms
85°/ 65° 29°/ 18°
50%
Friday
Rain Showers
82°/ 65° 28°/ 18°
40%
Saturday
Thunderstorms
88°/ 68° 31°/ 20°
70%
Sunday
Thunderstorms
78°/ 58° 26°/ 14°
60%
Monday
Thunderstorms
72°/ 55° 22°/ 13°
60%
Tuesday
Mostly Cloudy
72°/ 55° 22°/ 13°
0%
Wednesday
Cloudy
75°24°
0%

Day: Mostly cloudy. Patchy fog early in the morning. A chance of showers and thunderstorms in the morning. A slight chance of showers and thunderstorms late. Highs in the mid 80s. Northwest winds around 5 mph. Chance of precipitation 50 percent.

Night: Mostly cloudy. A slight chance of showers in the evening. A slight chance of thunderstorms. A chance of showers after midnight. Humid with lows in the mid 60s. Northeast winds around 5 mph. Chance of precipitation 40 percent.

Macomb, IL

Today
Thunderstorms
85°/ 68° 29°/ 20°
20%
Friday
Rain Showers
85°/ 68° 29°/ 20°
40%
Saturday
Partly Cloudy
88°/ 68° 31°/ 20°
70%
Sunday
Thunderstorms
78°/ 60° 26°/ 16°
70%
Monday
Rain Showers
68°/ 58° 20°/ 14°
70%
Tuesday
Mostly Cloudy
68°/ 55° 20°/ 13°
0%

Day: Partly sunny early this morning, then becoming mostly sunny. A slight chance of showers and thunderstorms early this morning. Patchy fog early this morning. Humid with highs in the mid 80s. Southeast winds around 5 mph, becoming west around 5 mph this afternoon. Chance of rain 20 percent.

Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds around 5 mph. Chance of rain 20 percent.

Monmouth, IL

Today
Thunderstorms
82°/ 65° 28°/ 18°
50%
Friday
Rain Showers
82°/ 68° 28°/ 20°
50%
Saturday
Partly Cloudy
85°/ 65° 29°/ 18°
70%
Sunday
Thunderstorms
75°/ 60° 24°/ 16°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tuesday
Mostly Cloudy
68°/ 55° 20°/ 13°
0%

Day: Mostly cloudy. A chance of showers and thunderstorms early this morning. Patchy fog early this morning. Some thunderstorms may produce heavy rainfall early this morning. Humid with highs in the lower 80s. East winds around 5 mph, becoming west around 5 mph this afternoon. Chance of rain 50 percent.

Night: Mostly cloudy. Humid with lows in the mid 60s. Northeast winds around 5 mph.

Petersburg, IL

Today
Sunny
92°/ 68° 33°/ 20°
30%
Friday
Thunderstorms
88°/ 70° 31°/ 21°
30%
Saturday
Partly Cloudy
92°/ 68° 33°/ 20°
50%
Sunday
Rain Showers
85°/ 62° 29°/ 17°
50%
Monday
Rain Showers
75°/ 58° 24°/ 14°
60%
Tuesday
Sunny
75°/ 55° 24°/ 13°
0%
Wednesday
Sunny
78°26°
0%

Day: Patchy fog this morning. Mostly sunny. Highs in the lower 90s. Southwest winds around 5 mph. Heat index values up to 100.

Night: Mostly clear in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds around 5 mph. Chance of rain 30 percent.

Aledo, IL

Today
Thunderstorms
82°/ 65° 28°/ 18°
50%
Friday
Rain Showers
80°/ 68° 27°/ 20°
50%
Saturday
Rain Showers
85°/ 65° 29°/ 18°
70%
Sun Night
Thunderstorms
58°14°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
60%
Tue Night-Wed
Cloudy
55°13°
0%

Day: Mostly cloudy. A chance of showers and thunderstorms early this morning. Patchy fog early this morning. Some thunderstorms may produce heavy rainfall early this morning. Humid with highs in the lower 80s. East winds around 5 mph, becoming northwest this afternoon. Chance of rain 50 percent.

Night: Mostly cloudy. Humid with lows in the mid 60s. Northeast winds 5 to 10 mph.

Clinton, IL

Today
Partly Cloudy
92°/ 68° 33°/ 20°
30%
Friday
Thunderstorms
85°/ 68° 29°/ 20°
30%
Saturday
Partly Cloudy
92°/ 68° 33°/ 20°
50%
Sunday
Rain Showers
82°/ 62° 28°/ 17°
50%
Monday
Thunderstorms
75°/ 58° 24°/ 14°
60%
Tuesday
Cloudy
75°24°
0%
Wednesday
Cloudy
75°24°
0%

Day: Partly sunny. Highs in the lower 90s. Northwest winds 5 to 10 mph, becoming southwest this afternoon.

Night: Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 30 percent.

Names listed above may include county names.

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