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 slight chance of rain showers before 1am, then a chance of showers and thunderstorms. Cloudy, with a low around 63. North northeast wind around 5 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: Sep 17, 2026 2:20 AM CDT.
The active forecast window currently covers Sep 17 to Sep 23, 2026 for Winthrop Harbor, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 17 to Sep 23, 2026
- Latest sync
- Sep 17, 2026 2:20 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Winthrop Harbor
Saturday looks like the warmest upcoming period in Winthrop Harbor at 78 degrees F.
Monday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Friday at about 10 to 15 mph ENE.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 17, 2026 2:20 AM 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
A chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Cloudy. High near 72, with temperatures falling to around 70 in the afternoon. North northeast wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Mostly cloudy, with a low around 61. Northeast wind 5 to 10 mph.
Partly sunny, with a high near 72. East northeast wind 10 to 15 mph.
A chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 62. Southeast wind 10 to 15 mph. Chance of precipitation is 70%.
Showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 90%.
Showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 61.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 69.
A chance of rain showers before 1am, then a chance of showers and thunderstorms. Cloudy, with a low around 56.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 68.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
A chance of rain showers. Mostly cloudy, with a high near 68.
A slight chance of rain showers. Mostly cloudy, with a low around 56.
A slight chance of rain showers before 7am. Partly sunny, with a high near 71.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Sep 17
|
Chance Showers And Thunderstorms
|
63°F |
5 mph
NNE
|
|
Thursday
Sep 17
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
72°F |
5 to 10 mph
NNE
|
|
Thursday Night
Sep 17
|
Mostly Cloudy
|
61°F |
5 to 10 mph
NE
|
|
Friday
Sep 18
|
Partly Sunny
|
72°F |
10 to 15 mph
ENE
|
|
Friday Night
Sep 18
|
Chance Showers And Thunderstorms
|
62°F |
10 to 15 mph
SE
|
|
Saturday
Sep 19
|
Showers And Thunderstorms
|
78°F |
10 to 15 mph
S
|
|
Saturday Night
Sep 19
|
Showers And Thunderstorms then Showers And Thunderstorms Likely
|
61°F |
10 mph
N
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
69°F |
10 to 15 mph
NE
|
|
Sunday Night
Sep 20
|
Chance Rain Showers
|
56°F |
10 to 15 mph
ENE
|
|
Monday
Sep 21
|
Chance Showers And Thunderstorms
|
68°F |
10 to 15 mph
ENE
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
55°F |
10 to 15 mph
E
|
|
Tuesday
Sep 22
|
Chance Rain Showers
|
68°F |
10 mph
ENE
|
|
Tuesday Night
Sep 22
|
Slight Chance Rain Showers
|
56°F |
5 to 10 mph
ENE
|
|
Wednesday
Sep 23
|
Slight Chance Rain Showers then Partly Sunny
|
71°F |
5 to 10 mph
ENE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Winthrop Harbor.