Swansea, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Swansea, IL in one place.
A chance of rain showers between 7am and 10am, then showers and thunderstorms likely. Mostly sunny, with a high near 91. Chance of precipitation is 70%.
Local Weather Overview
This forecast page for Swansea, 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 15, 2026 7:31 AM CDT.
The active forecast window currently covers Jul 17 to Jul 21, 2026 for Swansea, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 21, 2026
- Latest sync
- Jul 15, 2026 7:31 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Swansea
Monday looks like the warmest upcoming period in Swansea at 96 degrees F.
Friday Night is the coolest period ahead with temperatures near 74 degrees F.
The strongest winds are forecast for Tuesday at about 7 to 10 mph NW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 15, 2026 7:31 AM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
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 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 74. Chance of precipitation is 70%.
Sunny, with a high near 94.
Mostly clear, with a low around 75.
Sunny, with a high near 94.
Mostly clear, with a low around 74.
Mostly sunny, with a high near 96.
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 75. Chance of precipitation is 20%.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 91. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 17
|
Showers And Thunderstorms Likely
|
91°F |
2 to 7 mph
W
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
74°F |
2 to 6 mph
W
|
|
Saturday
Jul 18
|
Sunny
|
94°F |
6 to 9 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
75°F |
5 to 8 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
94°F |
8 mph
W
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
74°F |
2 to 6 mph
SW
|
|
Monday
Jul 20
|
Mostly Sunny
|
96°F |
5 to 9 mph
SW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
75°F |
7 mph
W
|
|
Tuesday
Jul 21
|
Slight Chance Rain Showers then Mostly Sunny
|
91°F |
7 to 10 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Swansea.