Forecast for Oswego, IL | Forecast Periods: 14
Sunday
Mar 15
2026
Oswego, IL
Updated: 1:21 PM CDT
59°F
Showers And Thunderstorms
25 mph S
Precipitation: 89%
Showers and thunderstorms. Cloudy. High near 59, with temperatures falling to around 57 in the afternoon. South wind around 25 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Hourly Forecast
Extended Forecast
Tonight
Sun, Mar 15
22°F
Rain Likely then Chance Sleet
20 mph WNW
Precipitation: 99%
Showers and thunderstorms before 9pm, then rain between 9pm and 11pm, then rain likely and a chance of sleet between 11pm and midnight, then a chance of sleet and a chance of rain and snow between midnight and 1am, then snow and areas of blowing snow. Cloudy. Low around 22, with temperatures rising to around 26 overnight. West northwest wind 20 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.
Monday
Mon, Mar 16
24°F
Snow And Areas Of Blowing Snow
25 mph WNW
Precipitation: 77%
Snow and areas of blowing snow before 4pm, then patchy blowing snow and a slight chance of snow. Cloudy. High near 24, with temperatures falling to around 22 in the afternoon. West northwest wind 25 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Monday Night
Mon, Mar 16
10°F
Patchy Blowing Snow then Mostly Cloudy
15 mph NW
Precipitation: 20%
Patchy blowing snow and a slight chance of snow before 7pm. Mostly cloudy, with a low around 10. Wind chill values as low as -5. Northwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 20%. New snow accumulation of less than half an inch possible.
Tuesday
Tue, Mar 17
23°F
Mostly Sunny
5 mph W
Precipitation: 1%
Mostly sunny, with a high near 23. West wind 5 to 10 mph, with gusts as high as 25 mph.
Tuesday Night
Tue, Mar 17
20°F
Snow Showers Likely
5 mph SSW
Precipitation: 62%
Snow showers likely after 7pm. Mostly cloudy, with a low around 20. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Wednesday
Wed, Mar 18
42°F
Snow Showers Likely
10 mph S
Precipitation: 62%
Snow showers likely before 1pm. Partly sunny, with a high near 42. New snow accumulation of less than half an inch possible.
Wednesday Night
Wed, Mar 18
32°F
Mostly Cloudy then Slight Chance Rain Showers
5 mph SSW
Precipitation: 16%
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 32.
Thursday
Thu, Mar 19
54°F
Slight Chance Rain Showers
5 mph NW
Precipitation: 16%
A slight chance of rain showers before 1pm. Mostly sunny, with a high near 54.
Thursday Night
Thu, Mar 19
35°F
Mostly Cloudy
5 mph ESE
Precipitation: 2%
Mostly cloudy, with a low around 35.
Friday
Fri, Mar 20
63°F
Partly Sunny
5 mph SW
Precipitation: 3%
Partly sunny, with a high near 63.
Friday Night
Fri, Mar 20
40°F
Mostly Cloudy
10 mph WNW
Precipitation: 2%
Mostly cloudy, with a low around 40.
Saturday
Sat, Mar 21
61°F
Mostly Sunny
10 mph NW
Precipitation: 2%
Mostly sunny, with a high near 61.
Saturday Night
Sat, Mar 21
37°F
Partly Cloudy
10 mph NNE
Precipitation: 7%
Partly cloudy, with a low around 37.