Olson, IL Weather Forecast & Current Conditions

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Olson Weather Map
UTC Time: 9/15/2026, 09:49
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Olson, IL Regional Weather

Expires:202609151000;;483449
ASUS43 KLOT 150910
RWRIL 

ILLINOIS REGIONAL WEATHER ROUNDUP
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
400 AM CDT TUE SEP 15 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.


ILZ003-004-008-010-011-017-018-151000-
NORTH CENTRAL ILLINOIS
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
ROCKFORD       CLOUDY    63  61  93 SE8       29.97F TC  17           
FREEPORT*      CLOUDY    67  63  88 S9        29.94F TC  19           
ROCHELLE*      MOCLDY    66  59  79 S5        30.00S TC  19           
DE KALB*       CLOUDY    68  57  67 W9G17     30.03R TC  20           
PERU*          MOCLDY    72  57  60 NW12      30.00R 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

Olson, IL

This Morning
Thunderstorms
58°14°
90%
Today
Thunderstorms
78°26°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
50%
Thursday
Thunderstorms
78°/ 58° 26°/ 14°
50%
Friday
Thunderstorms
75°/ 62° 24°/ 17°
70%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Rain Showers
72°/ 52° 22°/ 11°
30%

Day: Showers and a chance of thunderstorms. Warmer. Temperatures in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 90 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. North winds around 5 mph. Chance of precipitation 20 percent.

Freeport, IL

Today
Thunderstorms
75°/ 58° 24°/ 14°
100%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 58° 26°/ 14°
40%
Friday
Rain Showers
75°/ 62° 24°/ 17°
70%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Rain Showers
72°22°
30%

Day: Showers with a chance of thunderstorms early this morning, then a chance of showers with a slight chance of thunderstorms this afternoon. Humid with highs in the mid 70s. Southwest winds 10 to 15 mph with gusts up to 30 mph, becoming west 5 to 10 mph with gusts up to 20 mph this afternoon. Chance of rain near 100 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. North winds around 5 mph. Chance of rain 20 percent.

Rochelle, IL

This Morning
Thunderstorms
58°14°
90%
Today
Thunderstorms
78°26°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
60%
Thursday
Thunderstorms
78°/ 60° 26°/ 16°
50%
Friday
Thunderstorms
78°/ 62° 26°/ 17°
50%
Saturday
Thunderstorms
82°/ 60° 28°/ 16°
70%
Sunday
Rain Showers
72°/ 52° 22°/ 11°
30%

Day: Showers and a chance of thunderstorms. Warmer. Temperatures in the upper 60s. South winds 15 to 20 mph, diminishing to 10 to 15 mph late. Chance of precipitation 90 percent.

Night: Mostly cloudy. A slight chance of thunderstorms early in the evening. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 50s. North winds around 5 mph. Chance of precipitation 40 percent.

Janesville, WI

Tonight
Thunderstorms
65°18°
90%
Tuesday
Thunderstorms
75°/ 55° 24°/ 13°
90%
Wednesday
Rain Showers
72°/ 60° 22°/ 16°
70%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
40%
Friday
Rain Showers
75°/ 62° 24°/ 17°
70%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Near steady temperature in the mid 60s. South winds 15 to 20 mph. Chance of precipitation 90 percent.

Monroe, WI

Tonight
Thunderstorms
65°18°
90%
Tuesday
Thunderstorms
75°/ 55° 24°/ 13°
90%
Wednesday
Rain Showers
70°/ 62° 21°/ 17°
70%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
40%
Friday
Thunderstorms
75°/ 62° 24°/ 17°
80%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
80%
Sunday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Near steady temperature in the mid 60s. South winds 15 to 20 mph. Chance of precipitation 90 percent.

Belvidere, IL

This Morning
Thunderstorms
58°14°
90%
Today
Thunderstorms
78°26°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
50%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
50%
Friday
Thunderstorms
75°/ 62° 24°/ 17°
60%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Rain Showers
72°/ 52° 22°/ 11°
30%

Day: Showers and a chance of thunderstorms. Not as cool. Temperatures in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 90 percent.

Night: Mostly cloudy. A slight chance of showers in the late evening and overnight. Less humid with lows in the upper 50s. North winds around 5 mph. Chance of precipitation 20 percent.

DeKalb, IL

This Morning
Thunderstorms
60°16°
70%
Today
Thunderstorms
80°27°
90%
Wednesday
Thunderstorms
72°/ 62° 22°/ 17°
60%
Thursday
Thunderstorms
78°/ 62° 26°/ 17°
50%
Friday
Thunderstorms
78°/ 62° 26°/ 17°
50%
Saturday
Thunderstorms
82°/ 62° 28°/ 17°
70%
Sunday
Rain Showers
75°/ 55° 24°/ 13°
40%

Day: Mostly cloudy. A chance of showers late. A chance of thunderstorms. Showers likely late. Not as cool. Temperatures in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 70 percent.

Night: Mostly cloudy. A slight chance of showers in the evening. A slight chance of thunderstorms. A chance of showers after midnight. Lows around 60. North winds 5 to 10 mph, becoming northeast after midnight. Chance of precipitation 50 percent.

Mount Carroll, IL

Today
Thunderstorms
75°/ 58° 24°/ 14°
100%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
50%
Friday
Thunderstorms
78°/ 62° 26°/ 17°
60%
Saturday
Thunderstorms
82°/ 60° 28°/ 16°
70%
Sunday
Rain Showers
72°22°
40%

Day: Showers with a chance of thunderstorms early this morning, then a slight chance of showers and thunderstorms this afternoon. Humid with highs in the mid 70s. South winds 10 to 15 mph with gusts up to 25 mph, becoming west 5 to 10 mph this afternoon. Chance of rain near 100 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. North winds around 5 mph. Chance of rain 20 percent.

Whitewater, WI

Tonight
Thunderstorms
65°18°
90%
Tuesday
Thunderstorms
75°/ 55° 24°/ 13°
90%
Wednesday
Rain Showers
72°/ 60° 22°/ 16°
60%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
40%
Friday
Rain Showers
72°/ 62° 22°/ 17°
70%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Near steady temperature in the mid 60s. South winds 15 to 20 mph. Chance of precipitation 90 percent.

Crystal Lake, IL

This Morning
Thunderstorms
58°14°
90%
Today
Thunderstorms
78°26°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
50%
Thursday
Thunderstorms
75°/ 60° 24°/ 16°
50%
Friday
Rain Showers
75°/ 62° 24°/ 17°
60%
Saturday
Thunderstorms
78°/ 60° 26°/ 16°
70%
Sunday
Rain Showers
72°/ 55° 22°/ 13°
30%

Day: Mostly cloudy. A chance of showers late. A chance of thunderstorms. Showers late. Not as cool. Temperatures in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of precipitation 90 percent.

Night: Mostly cloudy. A slight chance of showers in the late evening and overnight. Lows in the upper 50s. North winds around 5 mph. Chance of precipitation 20 percent.

Dixon, IL

This Morning
Thunderstorms
60°16°
70%
Today
Thunderstorms
80°27°
90%
Wednesday
Thunderstorms
72°/ 65° 22°/ 18°
60%
Thursday
Thunderstorms
78°/ 62° 26°/ 17°
50%
Friday
Thunderstorms
78°/ 65° 26°/ 18°
50%
Saturday
Thunderstorms
82°/ 62° 28°/ 17°
60%
Sunday
Rain Showers
75°/ 55° 24°/ 13°
40%

Day: Mostly cloudy. A chance of showers late. A chance of thunderstorms. Showers likely late. Warmer. Temperatures in the upper 60s. South winds 15 to 20 mph, diminishing to 10 to 15 mph late. Chance of precipitation 70 percent.

Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows around 60. North winds 5 to 10 mph. Chance of precipitation 50 percent.

Darlington, WI

Tonight
Thunderstorms
65°18°
100%
Tuesday
Thunderstorms
72°/ 55° 22°/ 13°
90%
Wednesday
Thunderstorms
70°/ 62° 21°/ 17°
70%
Thursday
Thunderstorms
75°/ 60° 24°/ 16°
40%
Friday
Thunderstorms
75°/ 62° 24°/ 17°
80%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
80%
Sunday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Locally heavy rainfall possible. Near steady temperature in the mid 60s. South winds 10 to 15 mph with gusts to around 30 mph. Chance of precipitation near 100 percent.

Galena, IL

Today
Thunderstorms
75°/ 58° 24°/ 14°
100%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
40%
Friday
Thunderstorms
78°26°
70%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Rain Showers
72°22°
30%

Day: Showers with a chance of thunderstorms early this morning, then a chance of showers with a slight chance of thunderstorms this afternoon. Humid with highs in the mid 70s. Southwest winds 10 to 15 mph with gusts up to 25 mph, becoming west 5 to 10 mph this afternoon. Chance of rain near 100 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. North winds around 5 mph. Chance of rain 20 percent.

Madison, WI

Tonight
Thunderstorms
65°18°
90%
Tuesday
Thunderstorms
75°/ 55° 24°/ 13°
80%
Wednesday
Partly Cloudy
72°/ 58° 22°/ 14°
50%
Thursday
Rain Showers
75°/ 58° 24°/ 14°
20%
Friday
Rain Showers
72°/ 60° 22°/ 16°
80%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
80%
Sunday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Near steady temperature in the mid 60s. South winds 15 to 20 mph. Chance of precipitation 90 percent.

Sterling, IL

Today
Thunderstorms
78°/ 60° 26°/ 16°
100%
Wednesday
Rain Showers
75°/ 65° 24°/ 18°
80%
Thursday
Rain Showers
82°/ 62° 28°/ 17°
60%
Friday
Thunderstorms
80°/ 65° 27°/ 18°
50%
Saturday
Thunderstorms
82°/ 62° 28°/ 17°
50%
Sunday
Rain Showers
75°/ 55° 24°/ 13°
40%

Day: Showers with a chance of thunderstorms early this morning, then a chance of showers with a slight chance of thunderstorms this afternoon. Humid with highs in the upper 70s. South winds 10 to 15 mph with gusts up to 25 mph, becoming west 5 to 10 mph this afternoon. Chance of rain near 100 percent.

Night: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows around 60. North winds around 5 mph. Chance of rain 50 percent.

Aurora, IL

This Morning
Thunderstorms
62°17°
70%
Today
Thunderstorms
80°27°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
60%
Thursday
Thunderstorms
78°/ 62° 26°/ 17°
50%
Friday
Thunderstorms
78°/ 62° 26°/ 17°
50%
Saturday
Thunderstorms
82°/ 62° 28°/ 17°
70%
Sunday
Rain Showers
72°/ 55° 22°/ 13°
40%

Day: Mostly cloudy. A chance of showers and a slight chance of thunderstorms late, then showers likely and a chance of thunderstorms late. Temperatures in the mid 60s. South winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 70 percent.

Night: Mostly cloudy. A slight chance of showers in the evening. A slight chance of thunderstorms. A chance of showers after midnight. Lows in the lower 60s. North winds 5 to 10 mph, becoming northeast after midnight. Chance of precipitation 50 percent.

Watertown, WI

Tonight
Thunderstorms
62°17°
90%
Tuesday
Thunderstorms
75°/ 55° 24°/ 13°
80%
Wednesday
Partly Cloudy
72°/ 58° 22°/ 14°
50%
Thursday
Rain Showers
75°/ 58° 24°/ 14°
20%
Friday
Rain Showers
72°/ 60° 22°/ 16°
80%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
80%
Sunday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Near steady temperature in the lower 60s. South winds 15 to 20 mph. Chance of precipitation 90 percent.

Dodgeville, WI

Tonight
Thunderstorms
65°18°
90%
Tuesday
Thunderstorms
72°/ 52° 22°/ 11°
80%
Wednesday
Partly Cloudy
70°/ 60° 21°/ 16°
50%
Thursday
Rain Showers
75°/ 58° 24°/ 14°
40%
Friday
Thunderstorms
72°/ 62° 22°/ 17°
80%
Saturday
Thunderstorms
75°/ 58° 24°/ 14°
70%
Sunday
Thunderstorms
68°/ 52° 20°/ 11°
30%

Night: Warmer. Showers and scattered thunderstorms. Near steady temperature in the mid 60s. South winds 10 to 15 mph with gusts to around 30 mph. Chance of precipitation 90 percent.

Maquoketa, IA

Today
Thunderstorms
75°/ 58° 24°/ 14°
100%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
80%
Thursday
Rain Showers
78°/ 62° 26°/ 17°
50%
Friday
Thunderstorms
78°26°
70%
Saturday
Thunderstorms
78°/ 60° 26°/ 16°
70%
Sunday
Rain Showers
72°22°
30%

Day: Showers with a chance of thunderstorms early this morning, then a chance of showers with a slight chance of thunderstorms this afternoon. Humid with highs in the mid 70s. Southwest winds 10 to 15 mph with gusts up to 25 mph, becoming west 5 to 10 mph this afternoon. Chance of rain near 100 percent.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. North winds around 5 mph. Chance of rain 20 percent.

Kenosha, WI

Tonight
Thunderstorms
65°18°
80%
Tuesday
Thunderstorms
78°/ 58° 26°/ 14°
90%
Wednesday
Rain Showers
72°/ 62° 22°/ 17°
60%
Thursday
Thunderstorms
75°/ 58° 24°/ 14°
40%
Friday
Rain Showers
72°/ 62° 22°/ 17°
60%
Saturday
Thunderstorms
78°/ 58° 26°/ 14°
70%
Sunday
Thunderstorms
72°/ 55° 22°/ 13°
30%

Night: Warmer. Mostly cloudy with showers and scattered thunderstorms. Near steady temperature in the mid 60s. Southwest winds 10 to 15 mph. Chance of precipitation 80 percent.

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