Dorchester, IL Weather Forecast
Local 7-day forecast
Isolated Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Dorchester, IL in one place.
Isolated showers and thunderstorms. Sunny, with a high near 98. Heat index values as high as 103. South wind 6 to 9 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Dorchester, 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 15, 2026 5:15 PM CDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Dorchester, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 5:15 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Dorchester
This Afternoon looks like the warmest upcoming period in Dorchester at 98 degrees F.
Monday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Saturday at about 6 to 10 mph SW.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 5:15 PM 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
Scattered showers and thunderstorms. Mostly cloudy, with a low around 73. East wind around 5 mph. Chance of precipitation is 50%.
Scattered showers and thunderstorms. Partly sunny, with a high near 92. Heat index values as high as 100. Southeast wind around 5 mph. Chance of precipitation is 50%.
Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 72. South wind around 5 mph. Chance of precipitation is 20%.
A slight chance of rain showers between 7am and 1pm. Sunny, with a high near 95. West wind around 6 mph. Chance of precipitation is 20%.
Mostly clear, with a low around 70.
Sunny, with a high near 94.
Mostly clear, with a low around 71.
Mostly sunny, with a high near 94.
A chance of rain showers after 7pm. Partly cloudy, with a low around 70. Chance of precipitation is 30%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
A chance of rain showers. Partly sunny, with a high near 81. Chance of precipitation is 30%.
A chance of rain showers. Mostly cloudy, with a low around 60. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Sep 15
|
Isolated Showers And Thunderstorms
|
98°F |
6 to 9 mph
S
|
|
Tonight
Sep 15
|
Scattered Showers And Thunderstorms
|
73°F |
5 mph
E
|
|
Wednesday
Sep 16
|
Scattered Showers And Thunderstorms
|
92°F |
5 mph
SE
|
|
Wednesday Night
Sep 16
|
Isolated Showers And Thunderstorms then Mostly Clear
|
72°F |
5 mph
S
|
|
Thursday
Sep 17
|
Slight Chance Rain Showers
|
95°F |
6 mph
W
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
70°F |
3 mph
NE
|
|
Friday
Sep 18
|
Sunny
|
94°F |
6 mph
SE
|
|
Friday Night
Sep 18
|
Mostly Clear
|
71°F |
3 to 7 mph
S
|
|
Saturday
Sep 19
|
Mostly Sunny
|
94°F |
6 to 10 mph
SW
|
|
Saturday Night
Sep 19
|
Chance Rain Showers
|
70°F |
2 to 6 mph
SW
|
|
Sunday
Sep 20
|
Chance Rain Showers
|
89°F |
3 to 9 mph
NW
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
64°F |
5 to 9 mph
N
|
|
Monday
Sep 21
|
Chance Rain Showers
|
81°F |
6 to 10 mph
NW
|
|
Monday Night
Sep 21
|
Chance Rain Showers
|
60°F |
5 to 10 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Dorchester.