Mendon, IL Weather Forecast & Current Conditions

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Mendon, IL Weather Maps

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Mendon Weather Map
UTC Time: 9/20/2026, 00:52
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Mendon, IL Regional Weather

Expires:202609200100;;737018
ASUS43 KLOT 200010
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
700 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.


ILZ025>027-034>036-040-047-049-050-058-095>099-200100-
WEST-CENTRAL ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
QUINCY         PTCLDY    83  71  67 E6        29.87S HX  87  TC  28   
GALESBURG*     CLOUDY    75  73  92 E5        29.89R TC  24           
MACOMB*        MOCLDY    81  76  85 S7        29.87F HX  87  TC  27   
JACKSONVILLE*  MOCLDY    84  72  66 E3        29.87S HX  90  TC  29   
PITTSFIELD*    PTCLDY    85  72  64 CALM      29.88S HX  90  TC  29   
$$


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

Adams, MO

Tonight
Thunderstorms
68°20°
50%
Sunday
Thunderstorms
82°/ 62° 28°/ 17°
90%
Monday
Thunderstorms
68°/ 55° 20°/ 13°
90%
Tuesday
Rain Showers
65°/ 52° 18°/ 11°
20%
Wed-Wed Night
Cloudy
68°20°
0%
Thursday
Partly Cloudy
72°/ 58° 22°/ 14°
20%
Fri Night-Sat
Cloudy
58°14°
0%

Night: Partly cloudy this evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 60s. South winds around 5 mph, becoming west around 5 mph after midnight. Chance of rain 50 percent.

Rushville, IL

Tonight
Thunderstorms
68°20°
50%
Sunday
Thunderstorms
80°/ 60° 27°/ 16°
70%
Monday
Rain Showers
68°/ 55° 20°/ 13°
80%
Tuesday
Mostly Cloudy
65°18°
0%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
72°22°
0%
Friday
Mostly Cloudy
72°/ 55° 22°/ 13°
0%

Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 60s. South winds around 5 mph, becoming west with gusts up to 20 mph after midnight. Chance of rain 50 percent.

Jacksonville, IL

Tonight
Mostly Cloudy
68°20°
0%
Sunday
Thunderstorms
85°/ 62° 29°/ 17°
70%
Monday
Rain Showers
72°/ 55° 22°/ 13°
70%
Tuesday
Mostly Cloudy
68°20°
0%
Wednesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Thursday
Mostly Cloudy
75°24°
0%
Friday
Mostly Cloudy
75°/ 55° 24°/ 13°
0%

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.

Winchester, IL

Tonight
Mostly Cloudy
68°20°
0%
Sunday
Thunderstorms
85°/ 62° 29°/ 17°
70%
Monday
Rain Showers
72°/ 55° 22°/ 13°
70%
Tuesday
Mostly Cloudy
68°20°
0%
Wednesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Thursday
Mostly Cloudy
75°24°
0%
Friday
Mostly Cloudy
75°/ 55° 24°/ 13°
0%

Night: Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.

Beardstown, IL

Tonight
Rain Showers
68°20°
20%
Sunday
Thunderstorms
82°/ 60° 28°/ 16°
70%
Monday
Rain Showers
68°/ 55° 20°/ 13°
70%
Tuesday
Mostly Cloudy
68°20°
0%
Wednesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Thursday
Mostly Cloudy
75°24°
0%
Friday
Mostly Cloudy
75°/ 55° 24°/ 13°
0%

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 60s. Southwest winds around 5 mph. Chance of rain 20 percent.

Canton, IL

Tonight
Thunderstorms
68°20°
50%
Sunday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Monday
Rain Showers
65°/ 55° 18°/ 13°
80%
Tuesday
Mostly Cloudy
65°18°
0%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
72°22°
0%
Friday
Mostly Cloudy
72°/ 55° 22°/ 13°
0%

Night: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers this evening, then a chance of showers after midnight. Lows in the upper 60s. South winds around 5 mph, becoming west with gusts up to 20 mph after midnight. Chance of rain 50 percent.

Audrain, MO

Tonight
Mostly Cloudy
68°20°
0%
Sunday
Thunderstorms
85°/ 62° 29°/ 17°
90%
Monday
Thunderstorms
72°/ 55° 22°/ 13°
70%
Tue-Tue Night
Mostly Cloudy
68°20°
0%
Wed-Wed Night
Cloudy
70°21°
0%
Thursday
Partly Cloudy
72°/ 55° 22°/ 13°
20%
Fri Night-Sat
Cloudy
58°14°
0%

Night: Partly cloudy this evening, then becoming mostly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.

Havana, IL

Tonight
Thunderstorms
68°20°
20%
Sunday
Thunderstorms
80°/ 60° 27°/ 16°
60%
Monday
Rain Showers
68°/ 55° 20°/ 13°
70%
Tuesday
Mostly Cloudy
68°20°
0%
Wednesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Thursday
Mostly Cloudy
75°24°
0%
Friday
Mostly Cloudy
75°/ 55° 24°/ 13°
0%

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Southwest winds around 5 mph. Chance of rain 20 percent.

Greene, IL

Tonight
Cloudy
70°21°
0%
Sunday
Thunderstorms
88°/ 62° 31°/ 17°
70%
Monday
Thunderstorms
75°/ 55° 24°/ 13°
70%
Tue-Tue Night
Mostly Cloudy
68°20°
0%
Wed-Wed Night
Cloudy
72°22°
0%
Thursday
Partly Cloudy
75°/ 55° 24°/ 13°
20%
Fri Night-Sat
Cloudy
55°13°
0%

Night: Partly cloudy. Lows around 70. South winds around 5 mph.

Galesburg, IL

Tonight
Thunderstorms
68°20°
70%
Sunday
Thunderstorms
72°/ 58° 22°/ 14°
70%
Monday
Rain Showers
65°/ 55° 18°/ 13°
70%
Tuesday
Rain Showers
62°/ 50° 17°/ 10°
50%
Wed Night
Cloudy
52°11°
0%
Thursday
Mostly Cloudy
72°22°
0%
Friday
Mostly Cloudy
72°/ 55° 22°/ 13°
0%

Night: Mostly cloudy with a chance of thunderstorms. A chance of showers this evening, then showers likely after midnight. Lows in the upper 60s. South winds around 5 mph, becoming northeast with gusts up to 20 mph after midnight. Chance of rain 70 percent.

Montgomery, MO

Tonight
Cloudy
68°20°
0%
Sunday
Thunderstorms
88°/ 62° 31°/ 17°
90%
Monday
Thunderstorms
75°/ 58° 24°/ 14°
70%
Tue-Tue Night
Mostly Cloudy
68°20°
0%
Wed-Wed Night
Cloudy
72°22°
0%
Thursday
Partly Cloudy
75°/ 55° 24°/ 13°
20%
Fri Night-Sat
Cloudy
58°14°
0%

Night: Partly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.

Petersburg, IL

Tonight
Mostly Cloudy
68°20°
0%
Sunday
Thunderstorms
82°/ 60° 28°/ 16°
60%
Monday
Rain Showers
70°/ 55° 21°/ 13°
70%
Tuesday
Mostly Cloudy
68°20°
0%
Wednesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Thursday
Mostly Cloudy
75°24°
0%
Friday
Mostly Cloudy
75°/ 55° 24°/ 13°
0%

Night: Mostly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.

Springfield, IL

Tonight
Mostly Cloudy
70°21°
0%
Sunday
Thunderstorms
85°/ 62° 29°/ 17°
70%
Monday
Rain Showers
72°/ 55° 22°/ 13°
70%
Tuesday
Mostly Cloudy
68°20°
0%
Wednesday
Mostly Cloudy
68°/ 55° 20°/ 13°
0%
Thursday
Mostly Cloudy
75°24°
0%
Friday
Mostly Cloudy
75°/ 55° 24°/ 13°
0%

Night: Mostly cloudy. Lows around 70. South winds around 5 mph.

Boone, MO

Tonight
Mostly Cloudy
70°21°
0%
Sunday
Thunderstorms
88°/ 65° 31°/ 18°
90%
Monday
Thunderstorms
72°/ 58° 22°/ 14°
70%
Tue-Tue Night
Mostly Cloudy
68°20°
0%
Wed-Wed Night
Cloudy
72°22°
0%
Thursday
Partly Cloudy
75°/ 58° 24°/ 14°
20%
Friday
Rain Showers
78°/ 58° 26°/ 14°
30%
Saturday
Sunny
78°26°
0%

Night: Partly cloudy this evening, then becoming mostly cloudy. Lows around 70. Southwest winds around 5 mph.

Unionville, MO

Tonight
Thunderstorms
65°18°
70%
Sunday
Thunderstorms
72°/ 58° 22°/ 14°
70%
Monday
Rain Showers
62°/ 52° 17°/ 11°
70%
Tuesday
Mostly Cloudy
62°/ 48° 17°/
0%
Wed Night
Cloudy
48°
0%
Thu-Thu Night
Mostly Cloudy
68°20°
0%
Friday
Rain Showers
72°/ 58° 22°/ 14°
30%

Night: Partly cloudy this evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers this evening, then showers likely after midnight. Lows in the mid 60s. Southwest winds around 5 mph, becoming northwest around 5 mph after midnight. Chance of rain 70 percent.

Warren, MO

Tonight
Cloudy
70°21°
0%
Sunday
Thunderstorms
88°/ 65° 31°/ 18°
90%
Monday
Thunderstorms
75°/ 58° 24°/ 14°
70%
Tue-Tue Night
Mostly Cloudy
68°20°
0%
Wed-Wed Night
Cloudy
72°22°
0%
Thursday
Partly Cloudy
75°/ 55° 24°/ 13°
20%
Fri Night-Sat
Cloudy
58°14°
0%

Night: Partly cloudy. Lows around 70. Light and variable winds, becoming west around 5 mph after midnight.

Callaway, MO

Tonight
Mostly Cloudy
68°20°
0%
Sunday
Thunderstorms
85°/ 62° 29°/ 17°
90%
Monday
Thunderstorms
72°/ 55° 22°/ 13°
70%
Tue-Tue Night
Mostly Cloudy
68°20°
0%
Wed-Wed Night
Cloudy
70°21°
0%
Thursday
Partly Cloudy
72°/ 55° 22°/ 13°
20%
Fri Night-Sat
Cloudy
58°14°
0%

Night: Partly cloudy this evening, then becoming mostly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.

Brookfield, MO

Tonight
Thunderstorms
68°20°
50%
Sunday
Thunderstorms
78°/ 60° 26°/ 16°
80%
Monday
Rain Showers
68°/ 55° 20°/ 13°
70%
Tue-Tue Night
Mostly Cloudy
65°18°
0%
Wed-Wed Night
Cloudy
68°20°
0%
Thu-Thu Night
Mostly Cloudy
72°22°
0%
Friday
Rain Showers
75°/ 58° 24°/ 14°
30%

Night: Partly cloudy this evening, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms, mainly this evening. Lows in the upper 60s. South winds around 5 mph, becoming northwest after midnight. Chance of rain 50 percent.

Peoria, IL

Tonight
Thunderstorms
68°20°
50%
Sunday
Thunderstorms
75°/ 58° 24°/ 14°
50%
Monday
Rain Showers
65°/ 55° 18°/ 13°
70%
Tuesday
Mostly Cloudy
65°18°
0%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
72°22°
0%
Friday
Mostly Cloudy
72°/ 55° 22°/ 13°
0%

Night: Mostly cloudy. A slight chance of showers and thunderstorms this evening, then a chance of showers and thunderstorms after midnight. Lows in the upper 60s. South winds around 5 mph, becoming east after midnight. Chance of rain 50 percent.

Pekin, IL

Tonight
Thunderstorms
68°20°
20%
Sunday
Thunderstorms
78°/ 58° 26°/ 14°
50%
Monday
Rain Showers
68°/ 55° 20°/ 13°
70%
Tuesday
Mostly Cloudy
65°18°
0%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Mostly Cloudy
72°22°
0%
Friday
Mostly Cloudy
72°/ 55° 22°/ 13°
0%

Night: Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. South winds 5 to 10 mph. Chance of rain 20 percent.

Names listed above may include county names.

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