Winthrop Harbor, IL Weather Forecast
Local 7-day forecast
Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Winthrop Harbor, IL in one place.
Cloudy, with a high near 78. Southwest wind around 10 mph.
Local Weather Overview
This forecast page for Winthrop Harbor, 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 25, 2026 6:38 PM CDT.
The active forecast window currently covers Jul 25 to Jul 31, 2026 for Winthrop Harbor, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 25 to Jul 31, 2026
- Latest sync
- Jul 25, 2026 6:38 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Winthrop Harbor
Monday looks like the warmest upcoming period in Winthrop Harbor at 91 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Monday Night at about 10 to 15 mph WNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 25, 2026 6:38 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KMKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 69. Southwest wind 5 to 10 mph.
Mostly sunny, with a high near 89. Heat index values as high as 96. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
A chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 73. Heat index values as high as 96. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 91. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Mostly sunny, with a high near 80.
Mostly clear, with a low around 62.
Sunny, with a high near 80.
Mostly clear, with a low around 63.
Sunny, with a high near 84.
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 66.
A slight chance of showers and thunderstorms. Partly sunny, with a high near 85.
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jul 25
|
Cloudy
|
78°F |
10 mph
SW
|
|
Tonight
Jul 25
|
Mostly Cloudy
|
69°F |
5 to 10 mph
SW
|
|
Sunday
Jul 26
|
Mostly Sunny
|
89°F |
5 to 10 mph
SSW
|
|
Sunday Night
Jul 26
|
Chance Showers And Thunderstorms
|
73°F |
5 to 10 mph
SSW
|
|
Monday
Jul 27
|
Chance Showers And Thunderstorms
|
91°F |
5 to 10 mph
SW
|
|
Monday Night
Jul 27
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
68°F |
10 to 15 mph
WNW
|
|
Tuesday
Jul 28
|
Mostly Sunny
|
80°F |
15 mph
N
|
|
Tuesday Night
Jul 28
|
Mostly Clear
|
62°F |
5 to 15 mph
NNE
|
|
Wednesday
Jul 29
|
Sunny
|
80°F |
5 to 10 mph
NNE
|
|
Wednesday Night
Jul 29
|
Mostly Clear
|
63°F |
0 to 10 mph
NNE
|
|
Thursday
Jul 30
|
Sunny
|
84°F |
0 to 10 mph
ENE
|
|
Thursday Night
Jul 30
|
Slight Chance Showers And Thunderstorms
|
66°F |
0 to 5 mph
SE
|
|
Friday
Jul 31
|
Slight Chance Showers And Thunderstorms
|
85°F |
5 to 10 mph
W
|
|
Friday Night
Jul 31
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
66°F |
5 mph
WSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Winthrop Harbor.