Chesterfield, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Chesterfield, IL in one place.
A chance of showers and thunderstorms before 3am, then showers and thunderstorms likely. Mostly cloudy, with a low around 70. Northeast wind around 2 mph. Chance of precipitation is 60%.
Local Weather Overview
This forecast page for Chesterfield, 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 16, 2026 3:01 AM CDT.
The active forecast window currently covers Sep 16 to Sep 22, 2026 for Chesterfield, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 22, 2026
- Latest sync
- Sep 16, 2026 3:01 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Chesterfield
Thursday looks like the warmest upcoming period in Chesterfield at 95 degrees F.
Monday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Saturday at about 6 to 9 mph SW.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 16, 2026 3:01 AM CDT
- Coverage
- 7 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 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 94. Heat index values as high as 101. East wind around 5 mph. Chance of precipitation is 60%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 71. Heat index values as high as 100. Southeast wind around 3 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms between 8am and 1pm. Sunny, with a high near 95. Heat index values as high as 101. West wind 2 to 6 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. Northeast wind around 3 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 94. Chance of precipitation is 20%.
Mostly clear, with a low around 70.
Mostly sunny, with a high near 94.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 40%.
A chance of rain showers. Mostly cloudy, with a high near 81. Chance of precipitation is 30%.
A slight chance of rain showers. Mostly cloudy, with a low around 59. Chance of precipitation is 20%.
A slight chance of rain showers before 7am. Partly sunny, with a high near 79. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Sep 16
|
Chance Showers And Thunderstorms
|
70°F |
2 mph
NE
|
|
Wednesday
Sep 16
|
Showers And Thunderstorms Likely
|
94°F |
5 mph
E
|
|
Wednesday Night
Sep 16
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
71°F |
3 mph
SE
|
|
Thursday
Sep 17
|
Slight Chance Showers And Thunderstorms
|
95°F |
2 to 6 mph
W
|
|
Thursday Night
Sep 17
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
69°F |
3 mph
NE
|
|
Friday
Sep 18
|
Slight Chance Showers And Thunderstorms then Sunny
|
94°F |
5 mph
SE
|
|
Friday Night
Sep 18
|
Mostly Clear
|
70°F |
3 to 7 mph
S
|
|
Saturday
Sep 19
|
Mostly Sunny
|
94°F |
6 to 9 mph
SW
|
|
Saturday Night
Sep 19
|
Slight Chance Showers And Thunderstorms
|
69°F |
5 mph
SW
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
89°F |
3 to 8 mph
NW
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
63°F |
3 to 8 mph
N
|
|
Monday
Sep 21
|
Chance Rain Showers
|
81°F |
5 to 9 mph
NW
|
|
Monday Night
Sep 21
|
Slight Chance Rain Showers
|
59°F |
5 to 9 mph
N
|
|
Tuesday
Sep 22
|
Slight Chance Rain Showers then Partly Sunny
|
79°F |
5 to 8 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Chesterfield.