Winthrop Harbor, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Winthrop Harbor, IL in one place.
Mostly sunny, with a high near 49.
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: Apr 16, 2026 6:32 AM CDT.
The active forecast window currently covers Apr 19 to Apr 22, 2026 for Winthrop Harbor, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 19 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 6:32 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Winthrop Harbor
Tuesday looks like the warmest upcoming period in Winthrop Harbor at 70 degrees F.
Sunday Night is the coolest period ahead with temperatures near 33 degrees F.
The strongest winds are forecast for Sunday at about 10 to 15 mph WNW.
The forecast from Apr 19 through Apr 22 stays mostly dry.
Forecast Details
- Last updated
- Apr 16, 2026 6:32 AM CDT
- Coverage
- 4 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
Areas of frost after 2am. Partly cloudy, with a low around 33.
Areas of frost before 8am. Sunny, with a high near 54.
Partly cloudy, with a low around 44.
Mostly sunny, with a high near 70.
Partly cloudy, with a low around 47.
Mostly sunny, with a high near 65.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Apr 19
|
Mostly Sunny
|
49°F |
10 to 15 mph
WNW
|
|
Sunday Night
Apr 19
|
Partly Cloudy then Areas Of Frost
|
33°F |
5 to 10 mph
NW
|
|
Monday
Apr 20
|
Areas Of Frost then Sunny
|
54°F |
5 to 10 mph
ESE
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
44°F |
10 to 15 mph
S
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
70°F |
15 mph
SW
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
47°F |
10 mph
WSW
|
|
Wednesday
Apr 22
|
Mostly Sunny
|
65°F |
10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Winthrop Harbor.