Oswego, IL Weather Forecast
Local 7-day forecast
Patchy Fog then Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Oswego, IL in one place.
Patchy fog before 8am. Sunny, with a high near 93. Heat index values as high as 101. Northwest wind 0 to 5 mph.
Local Weather Overview
This forecast page for Oswego, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 14, 2026 9:13 AM CDT.
The active forecast window currently covers Jul 14 to Jul 20, 2026 for Oswego, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 14 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 9:13 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Oswego
Wednesday looks like the warmest upcoming period in Oswego at 94 degrees F.
Monday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Saturday at about 5 to 15 mph WSW.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 9:13 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 72. Heat index values as high as 100. West wind around 5 mph.
Sunny, with a high near 94. Heat index values as high as 103. West northwest wind around 5 mph.
Mostly clear, with a low around 72. Heat index values as high as 102. West southwest wind 0 to 5 mph.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. West southwest wind 0 to 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 72. Chance of precipitation is 20%.
A chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66.
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Sunny, with a high near 85.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Jul 14
|
Patchy Fog then Sunny
|
93°F |
0 to 5 mph
NW
|
|
Tonight
Jul 14
|
Mostly Clear
|
72°F |
5 mph
W
|
|
Wednesday
Jul 15
|
Sunny
|
94°F |
5 mph
WNW
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
72°F |
0 to 5 mph
WSW
|
|
Thursday
Jul 16
|
Sunny then Slight Chance Showers And Thunderstorms
|
93°F |
0 to 5 mph
WSW
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
0 to 5 mph
ESE
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
90°F |
0 to 10 mph
S
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms
|
72°F |
5 mph
S
|
|
Saturday
Jul 18
|
Mostly Sunny then Chance Showers And Thunderstorms
|
90°F |
5 to 15 mph
WSW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
70°F |
10 mph
WNW
|
|
Sunday
Jul 19
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
10 to 15 mph
N
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms
|
66°F |
5 to 15 mph
NE
|
|
Monday
Jul 20
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
85°F |
5 to 10 mph
W
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
64°F |
5 to 10 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Oswego.
