Oswego, IL Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Oswego, IL.

Current Conditions — Oswego, IL

CHICAGO/DUPAGE (KDPA)

Cloudy

51.8 F
Humidity:76%
Wind Speed: mph
Barometer:29.92 in
Dewpoint:44.6 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 28 2026, 09:25 AM CDT
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5-Day Forecast — Oswego, IL

Tuesday

High 62 °F
Overcast
Tuesday
Night
Low 48 °F
Chance of Rain
Wednesday

High 59 °F
Slight Chance of Rain Showers
Wednesday
Night
Low 39 °F
Mostly Clear
Thursday

High 59 °F
Mostly Cloudy
Thursday
Night
Low 37 °F
Partly Cloudy
Friday

High 53 °F
Mostly Cloudy
Friday
Night
Low 35 °F
Mostly Clear
Saturday

High 57 °F
Partly Sunny

Detailed Forecast — Oswego, IL

Tuesday
Overcast. High near 62°F. Wind 6 to 14 mph, with gusts as high as 25 mph.
Tuesday Night
Chance of Rain. Low around 48°F. Wind 5 to 8 mph, with gusts as high as 12 mph.
Wednesday
Slight Chance of Rain Showers. High near 59°F. Wind 8 to 14 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly Clear. Low around 39°F. Wind 3 to 5 mph, with gusts as high as 6 mph.
Thursday
Mostly Cloudy. High near 59°F. Wind 8 to 12 mph, with gusts as high as 17 mph.
Thursday Night
Partly Cloudy. Low around 37°F. Wind around 3 mph, with gusts as high as 8 mph.
Friday
Mostly Cloudy. High near 53°F. Wind 7 to 10 mph, with gusts as high as 16 mph.
Friday Night
Mostly Clear. Low around 35°F. Wind around 1 mph, with gusts as high as 5 mph.
Saturday
Partly Sunny. High near 57°F. Wind 6 to 8 mph, with gusts as high as 14 mph.
Saturday Night
Mostly Clear. Low around 39°F. Wind around 5 mph, with gusts as high as 10 mph.
Sunday
Partly Sunny. High near 68°F. Wind 9 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Chance of Rain. Low around 46°F. Wind around 6 mph, with gusts as high as 10 mph.
Monday
Slight Chance of Rain Showers. High near 68°F. Wind 9 to 10 mph, with gusts as high as 17 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 28, 2026

Observation History — Oswego, IL

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
09:25 AM CDT 10.00 Cloudy -- 51.8 44.6 76% NA NA 29.92 1013.2
09:20 AM CDT 12.7 10.00 Cloudy -- 51.8 44.6 76% NA NA 29.91 1012.9
09:15 AM CDT W 16.1 G 21.9 10.00 Cloudy -- 51.8 44.6 76% NA NA 29.91 1012.9
09:00 AM CDT W 13.8 10.00 Cloudy -- 51.8 44.6 76% NA NA 29.90 1012.5
08:50 AM CDT 10.00 Cloudy -- 51.8 42.8 71% NA NA 29.91 1012.9
08:45 AM CDT 16.1 G 21.9 10.00 Cloudy -- 51.8 42.8 71% NA NA 29.90 1012.5
08:40 AM CDT W 15.0 10.00 Cloudy -- 51.8 42.8 71% NA NA 29.90 1012.5
08:35 AM CDT 17.3 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.90 1012.5
08:30 AM CDT W 13.8 G 19.6 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.90 1012.5
08:20 AM CDT W 15.0 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.89 1012.2
08:15 AM CDT W 11.5 G 18.4 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.89 1012.2
08:05 AM CDT W 15.0 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.88 1011.9
08:00 AM CDT W 13.8 G 20.7 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.88 1011.9
07:50 AM CDT 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.86 1011.2
07:40 AM CDT 10.00 Cloudy -- 50.0 44.6 82% NA NA 29.86 1011.2
07:35 AM CDT G 29.9 10.00 Cloudy -- 50.0 44.6 82% NA NA 29.86 1011.2
07:30 AM CDT W 16.1 10.00 Cloudy -- 50.0 42.8 76% NA NA 29.85 1010.8
07:25 AM CDT 10.00 Cloudy -- 50.0 44.6 82% NA NA 29.84 1010.5
07:10 AM CDT W 11.5 10.00 Cloudy -- 50.0 44.6 82% NA NA 29.83 1010.2
07:05 AM CDT W 11.5 10.00 Cloudy -- 50.0 44.6 82% NA NA 29.83 1010.2
07:00 AM CDT W 15.0 G 20.7 10.00 Cloudy -- 50.0 44.6 82% NA NA 29.83 1010.2
06:50 AM CDT W 15.0 10.00 Cloudy -- 48.2 44.6 87% 42.3 NA 29.82 1009.8
06:45 AM CDT W 15.0 10.00 Cloudy -- 48.2 46.4 93% 42.3 NA 29.81 1009.5
06:40 AM CDT 10.00 Cloudy -- 48.2 46.4 93% NA NA 29.80 1009.1

Regional Weather Observation

CHICAGO/DUPAGE (KDPA)

Cloudy
51.8 F

CHICAGO/AURORA (KARR)

Cloudy
51.8 F

SCHAUMBURG (K06C)

Cloudy
51.3 F

ROMEOVILLE/CHI (KLOT)

Cloudy
51.8 F

JOLIET (KJOT)

Cloudy
53.6 F

MORRIS-WASHBURN (KC09)

Cloudy
50.9 F
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