Winthrop Harbor, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Winthrop Harbor, IL in one place.
A chance of showers and thunderstorms. Mostly cloudy. High near 73, with temperatures falling to around 70 in the afternoon. Southeast wind 10 to 15 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
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: Jun 8, 2026 4:41 PM CDT.
The active forecast window currently covers Jun 8 to Jun 14, 2026 for Winthrop Harbor, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 8 to Jun 14, 2026
- Latest sync
- Jun 8, 2026 4:41 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Winthrop Harbor
Wednesday looks like the warmest upcoming period in Winthrop Harbor at 90 degrees F.
Sunday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Wednesday at about 5 to 20 mph S.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 8, 2026 4:41 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
Showers and thunderstorms likely before 8pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 65. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Mostly cloudy, with a high near 84. Southwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers between 1am and 2am, then a chance of showers and thunderstorms between 2am and 4am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 63. East southeast wind around 5 mph. Chance of precipitation is 50%.
A chance of rain showers before 7am. Partly sunny, with a high near 90. South wind 5 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Showers and thunderstorms likely after 7pm. Mostly cloudy, with a low around 68. Chance of precipitation is 70%.
Showers and thunderstorms likely. Mostly sunny, with a high near 86.
Showers and thunderstorms likely before 1am. Mostly cloudy, with a low around 58.
Mostly sunny, with a high near 78.
Mostly clear, with a low around 60.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 81.
A chance of showers and thunderstorms. Partly cloudy, with a low around 59.
A chance of showers and thunderstorms. Mostly sunny, with a high near 74.
A slight chance of rain showers. Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jun 8
|
Chance Showers And Thunderstorms
|
73°F |
10 to 15 mph
SE
|
|
Tonight
Jun 8
|
Showers And Thunderstorms Likely
|
65°F |
5 to 10 mph
SSE
|
|
Tuesday
Jun 9
|
Chance Showers And Thunderstorms
|
84°F |
5 to 10 mph
SW
|
|
Tuesday Night
Jun 9
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
63°F |
5 mph
ESE
|
|
Wednesday
Jun 10
|
Chance Rain Showers then Partly Sunny
|
90°F |
5 to 20 mph
S
|
|
Wednesday Night
Jun 10
|
Showers And Thunderstorms Likely
|
68°F |
10 to 20 mph
SW
|
|
Thursday
Jun 11
|
Showers And Thunderstorms Likely
|
86°F |
10 to 20 mph
SSW
|
|
Thursday Night
Jun 11
|
Showers And Thunderstorms Likely
|
58°F |
5 to 15 mph
WSW
|
|
Friday
Jun 12
|
Mostly Sunny
|
78°F |
5 to 15 mph
W
|
|
Friday Night
Jun 12
|
Mostly Clear
|
60°F |
5 to 10 mph
WSW
|
|
Saturday
Jun 13
|
Sunny then Slight Chance Showers And Thunderstorms
|
81°F |
5 to 15 mph
WSW
|
|
Saturday Night
Jun 13
|
Chance Showers And Thunderstorms
|
59°F |
5 to 10 mph
WNW
|
|
Sunday
Jun 14
|
Chance Showers And Thunderstorms
|
74°F |
5 to 10 mph
NNW
|
|
Sunday Night
Jun 14
|
Slight Chance Rain Showers
|
55°F |
5 to 10 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Winthrop Harbor.