Harmon, IL Weather Forecast & Current Conditions

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Harmon Weather Map
UTC Time: 9/14/2026, 11:02
Your Time:

Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Harmon, IL Regional Weather

Expires:202609141200;;433138
ASUS43 KLOT 141058
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
600 AM CDT MON SEP 14 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.


ILZ003-004-008-010-011-017-018-141200-
NORTH CENTRAL ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
ROCKFORD       PTCLDY    46  46 100 CALM      30.26F TC   8           
$$


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

Harmon, IL

This Morning
Clear
68°20°
70%
Today
Rain Showers
72°22°
20%
Tuesday
Thunderstorms
78°/ 60° 26°/ 16°
70%
Wednesday
Thunderstorms
75°/ 65° 24°/ 18°
70%
Thursday
Thunderstorms
80°/ 62° 27°/ 17°
60%
Friday
Rain Showers
80°/ 65° 27°/ 18°
50%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
70%

Day: Mostly clear. Patchy fog. Temperatures in the mid 40s. Light and variable winds.

Night: Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers after midnight. A chance of thunderstorms after midnight. Showers likely late. Much warmer. Near steady temperature in the upper 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 70 percent.

Sterling, IL

Today
Rain Showers
75°/ 68° 24°/ 20°
70%
Tuesday
Thunderstorms
80°/ 60° 27°/ 16°
90%
Wednesday
Rain Showers
75°/ 65° 24°/ 18°
90%
Thursday
Rain Showers
80°/ 62° 27°/ 17°
70%
Friday
Rain Showers
82°/ 65° 28°/ 18°
50%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
70%

Day: Mostly sunny after midnight, then becoming mostly cloudy. Patchy fog after midnight. A slight chance of showers this afternoon. Highs in the mid 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast 10 to 15 mph with gusts up to 25 mph this afternoon. Chance of rain 20 percent.

Night: Mostly cloudy. Showers likely with a chance of thunderstorms after midnight. Much warmer with lows in the upper 60s. South winds 15 to 20 mph. Chance of rain 70 percent.

Princeton, IL

Today
Rain Showers
75°/ 68° 24°/ 20°
70%
Tuesday
Thunderstorms
82°/ 62° 28°/ 17°
90%
Wednesday
Rain Showers
78°/ 68° 26°/ 20°
90%
Thu Night
Rain Showers
65°18°
40%
Friday
Rain Showers
82°/ 65° 28°/ 18°
50%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
60%

Day: Mostly sunny, then becoming mostly sunny this morning, then becoming mostly cloudy. Patchy fog after midnight. A slight chance of showers this afternoon. Highs in the mid 70s. Northeast winds around 5 mph, increasing to southeast 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent.

Night: Partly cloudy in the evening, then mostly cloudy with showers likely with a chance of thunderstorms after midnight. Much warmer with lows in the upper 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent.

Rochelle, IL

This Morning
Cloudy
65°18°
70%
Today
Rain Showers
72°22°
20%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Thursday
Thunderstorms
78°/ 62° 26°/ 17°
60%
Friday
Rain Showers
78°/ 62° 26°/ 17°
60%
Saturday
Rain Showers
78°/ 58° 26°/ 14°
70%

Day: Mostly clear late, then becoming partly cloudy. Patchy fog. Temperatures in the mid 40s. Light and variable winds.

Night: Mostly cloudy. A slight chance of showers early in the evening. Showers likely with a chance of thunderstorms after midnight. Much warmer. Near steady temperature in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 70 percent.

Mount Carroll, IL

Today
Rain Showers
72°/ 65° 22°/ 18°
90%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
90%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
60%
Friday
Rain Showers
78°/ 62° 26°/ 17°
70%
Saturday
Rain Showers
78°/ 58° 26°/ 14°
70%

Day: Mostly sunny, then becoming mostly sunny this morning, then becoming mostly cloudy. Patchy fog after midnight. A chance of showers this afternoon. Highs in the lower 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast 10 to 15 mph with gusts up to 25 mph this afternoon. Chance of rain 30 percent.

Night: Mostly cloudy. Showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Much warmer with lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent.

Geneseo, IL

Today
Rain Showers
75°/ 72° 24°/ 22°
70%
Tuesday
Thunderstorms
82°/ 62° 28°/ 17°
90%
Wednesday
Rain Showers
78°/ 68° 26°/ 20°
90%
Thu Night
Rain Showers
65°18°
40%
Friday
Rain Showers
82°/ 65° 28°/ 18°
50%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
60%

Day: Partly cloudy after midnight, then becoming partly sunny. A chance of showers this afternoon. Highs in the mid 70s. East winds around 5 mph, becoming southeast 10 to 15 mph with gusts up to 25 mph. Chance of rain 30 percent.

Night: Partly cloudy in the evening, then mostly cloudy with showers likely with a chance of thunderstorms after midnight. Much warmer. Near steady temperature in the lower 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent.

Ottawa, IL

This Morning
Clear
68°20°
50%
Today
Mostly Cloudy
75°24°
0%
Tuesday
Thunderstorms
82°/ 65° 28°/ 18°
70%
Wednesday
Thunderstorms
78°/ 68° 26°/ 20°
70%
Thursday
Thunderstorms
82°/ 65° 28°/ 18°
60%
Friday
Rain Showers
82°/ 65° 28°/ 18°
50%
Saturday
Rain Showers
80°/ 62° 27°/ 17°
60%

Day: Clear. Patchy fog. Temperatures in the upper 40s. Light and variable winds.

Night: Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of showers and thunderstorms after midnight. A chance of showers and thunderstorms late. Much warmer. Near steady temperature in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of precipitation 50 percent.

DeKalb, IL

This Morning
Clear
65°18°
70%
Today
Rain Showers
72°22°
20%
Tuesday
Thunderstorms
78°/ 60° 26°/ 16°
70%
Wednesday
Thunderstorms
75°/ 65° 24°/ 18°
70%
Thursday
Thunderstorms
80°/ 62° 27°/ 17°
60%
Friday
Rain Showers
78°/ 65° 26°/ 18°
50%
Saturday
Rain Showers
78°/ 60° 26°/ 16°
70%

Day: Mostly clear. Patchy fog. Temperatures in the upper 40s. Light and variable winds.

Night: Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers after midnight. A chance of thunderstorms after midnight. Showers likely late. Warmer. Near steady temperature in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 70 percent.

Moline, IL

Today
Rain Showers
75°/ 72° 24°/ 22°
90%
Tuesday
Thunderstorms
78°/ 62° 26°/ 17°
90%
Wednesday
Rain Showers
75°/ 68° 24°/ 20°
90%
Thursday
Rain Showers
80°/ 65° 27°/ 18°
70%
Friday
Thunderstorms
82°/ 65° 28°/ 18°
50%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
70%

Day: Partly cloudy after midnight, then becoming partly sunny. A chance of showers this afternoon. Highs in the mid 70s. East winds around 5 mph, increasing to southeast 10 to 15 mph with gusts up to 30 mph. Chance of rain 30 percent.

Night: Partly cloudy in the evening, then mostly cloudy with showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Much warmer. Near steady temperature in the lower 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent.

Toulon, IL

Today
Partly Cloudy
78°/ 68° 26°/ 20°
50%
Tuesday
Thunderstorms
82°/ 62° 28°/ 17°
90%
Wednesday
Rain Showers
78°/ 68° 26°/ 20°
90%
Thursday
Rain Showers
82°/ 65° 28°/ 18°
60%
Friday
Rain Showers
82°/ 65° 28°/ 18°
40%
Saturday
Rain Showers
80°/ 62° 27°/ 17°
50%

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

Night: Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Not as cool with lows in the upper 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 50 percent.

Hennepin, IL

Today
Cloudy
75°/ 68° 24°/ 20°
50%
Tuesday
Thunderstorms
85°/ 65° 29°/ 18°
90%
Wednesday
Rain Showers
80°/ 68° 27°/ 20°
90%
Thursday
Rain Showers
82°/ 65° 28°/ 18°
60%
Friday
Rain Showers
82°/ 68° 28°/ 20°
40%
Saturday
Rain Showers
80°/ 62° 27°/ 17°
60%

Day: Patchy fog after midnight. Partly cloudy. Highs in the mid 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast 10 to 15 mph this afternoon.

Night: Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Much warmer with lows in the upper 60s. South winds 15 to 20 mph. Chance of rain 50 percent.

Freeport, IL

Today
Rain Showers
72°/ 65° 22°/ 18°
90%
Tuesday
Thunderstorms
78°/ 55° 26°/ 13°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
90%
Thursday
Rain Showers
78°/ 60° 26°/ 16°
50%
Friday
Rain Showers
78°/ 62° 26°/ 17°
70%
Saturday
Rain Showers
75°/ 58° 24°/ 14°
70%

Day: Mostly sunny, then becoming mostly sunny this morning, then becoming mostly cloudy. Patchy fog after midnight. A chance of showers this afternoon. Highs in the lower 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast 10 to 15 mph with gusts up to 25 mph this afternoon. Chance of rain 30 percent.

Night: Mostly cloudy. Showers with a chance of thunderstorms after midnight. Much warmer with lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent.

Clinton, IA

Today
Rain Showers
72°/ 68° 22°/ 20°
90%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
90%
Wednesday
Rain Showers
72°/ 65° 22°/ 18°
90%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
60%
Friday
Rain Showers
80°/ 65° 27°/ 18°
70%
Saturday
Rain Showers
78°/ 60° 26°/ 16°
70%

Day: Partly cloudy after midnight, then becoming partly sunny. Patchy fog after midnight. A chance of showers this afternoon. Highs in the lower 70s. Northeast winds around 5 mph, increasing to southeast 10 to 15 mph with gusts up to 25 mph. Chance of rain 40 percent.

Night: Mostly cloudy. Showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Much warmer with lows in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90 percent.

Rockford, IL

This Morning
Cloudy
65°18°
70%
Today
Rain Showers
72°22°
20%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Wednesday
Thunderstorms
72°/ 65° 22°/ 18°
80%
Thursday
Rain Showers
78°/ 60° 26°/ 16°
60%
Friday
Rain Showers
78°/ 62° 26°/ 17°
70%
Saturday
Rain Showers
75°/ 58° 24°/ 14°
70%

Day: Mostly clear late, then becoming partly cloudy. Patchy fog. Temperatures in the upper 40s. Light and variable winds.

Night: Mostly cloudy. A slight chance of showers early in the evening. Showers likely with a chance of thunderstorms after midnight. Breezy, warmer with lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of precipitation 70 percent.

Maquoketa, IA

Today
Rain Showers
72°/ 68° 22°/ 20°
100%
Tuesday
Thunderstorms
75°/ 58° 24°/ 14°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
90%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
60%
Friday
Rain Showers
78°/ 65° 26°/ 18°
70%
Saturday
Rain Showers
78°/ 58° 26°/ 14°
70%

Day: Partly cloudy after midnight, then becoming partly sunny. Patchy fog after midnight. A chance of showers this afternoon. Highs in the lower 70s. Northeast winds around 5 mph, increasing to southeast 10 to 15 mph with gusts up to 25 mph. Chance of rain 40 percent.

Night: Showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Much warmer. Near steady temperature in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain near 100 percent.

Davenport, IA

Today
Rain Showers
75°/ 72° 24°/ 22°
90%
Tuesday
Thunderstorms
78°/ 62° 26°/ 17°
90%
Wednesday
Rain Showers
75°/ 65° 24°/ 18°
90%
Thursday
Rain Showers
80°/ 65° 27°/ 18°
70%
Friday
Rain Showers
82°/ 65° 28°/ 18°
60%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
70%

Day: Partly cloudy after midnight, then becoming partly sunny. A chance of showers this afternoon. Highs in the mid 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast 10 to 15 mph with gusts up to 25 mph this afternoon. Chance of rain 40 percent.

Night: Mostly cloudy. Showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Much warmer. Near steady temperature in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90 percent.

Lacon, IL

Today
Sunny
78°/ 70° 26°/ 21°
40%
Tuesday
Thunderstorms
85°/ 65° 29°/ 18°
90%
Wednesday
Rain Showers
82°/ 68° 28°/ 20°
90%
Thu Night
Rain Showers
65°18°
30%
Friday
Rain Showers
82°/ 68° 28°/ 20°
40%
Saturday
Rain Showers
82°/ 62° 28°/ 17°
50%

Day: Mostly sunny. Highs in the upper 70s. Southeast winds 10 to 15 mph.

Night: Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Not as cool with lows around 70. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 40 percent.

Galena, IL

Today
Rain Showers
72°/ 68° 22°/ 20°
90%
Tuesday
Thunderstorms
75°/ 58° 24°/ 14°
70%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
90%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
60%
Friday
Rain Showers
78°/ 62° 26°/ 17°
70%
Saturday
Rain Showers
75°/ 58° 24°/ 14°
70%

Day: Mostly sunny, then becoming mostly sunny this morning, then becoming mostly cloudy. Patchy fog after midnight. A chance of showers this afternoon. Highs in the lower 70s. East winds 5 to 10 mph with gusts up to 20 mph, becoming southeast 10 to 15 mph with gusts up to 30 mph this afternoon. Chance of rain 40 percent.

Night: Mostly cloudy. Showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Much warmer. Near steady temperature in the upper 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent.

Belvidere, IL

This Morning
Clear
65°18°
70%
Today
Rain Showers
72°22°
20%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Wednesday
Thunderstorms
72°/ 65° 22°/ 18°
80%
Thursday
Rain Showers
78°/ 60° 26°/ 16°
60%
Friday
Rain Showers
78°/ 62° 26°/ 17°
70%
Saturday
Rain Showers
75°/ 58° 24°/ 14°
70%

Day: Mostly clear. Patchy fog. Temperatures in the mid 40s. Light and variable winds.

Night: Mostly cloudy. A slight chance of showers early in the evening. Showers likely with a chance of thunderstorms after midnight. Warmer. Near steady temperature in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 70 percent.

Oswego, IL

This Morning
Clear
68°20°
50%
Today
Mostly Cloudy
75°24°
0%
Tuesday
Thunderstorms
82°/ 62° 28°/ 17°
70%
Wednesday
Thunderstorms
78°/ 68° 26°/ 20°
70%
Thursday
Thunderstorms
82°/ 65° 28°/ 18°
60%
Friday
Rain Showers
82°/ 65° 28°/ 18°
50%
Saturday
Rain Showers
78°/ 62° 26°/ 17°
60%

Day: Clear. Patchy fog. Temperatures in the upper 40s. Light and variable winds.

Night: Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms late. Warmer with lows in the upper 60s. Southeast winds 10 to 15 mph, increasing to south 15 to 20 mph after midnight. Chance of precipitation 50 percent.

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