Marietta, IL Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Marietta, IL in one place.
Partly sunny, with a high near 80. East wind around 6 mph.
Local Weather Overview
This forecast page for Marietta, 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: Jun 27, 2026 1:26 AM CDT.
The active forecast window currently covers Jun 27 to Jul 3, 2026 for Marietta, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 27 to Jul 3, 2026
- Latest sync
- Jun 27, 2026 1:26 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Marietta
Wednesday looks like the warmest upcoming period in Marietta at 95 degrees F.
Saturday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Sunday at about 8 to 15 mph SSE.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 27, 2026 1:26 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
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 after 11pm. Mostly cloudy, with a low around 67. East southeast wind 5 to 8 mph, with gusts as high as 17 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 90. Heat index values as high as 102. South southeast wind 8 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Mostly clear, with a low around 74. South wind 8 to 13 mph, with gusts as high as 22 mph.
Mostly sunny, with a high near 92. South wind 8 to 15 mph, with gusts as high as 24 mph.
Partly cloudy, with a low around 76. South southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Sunny, with a high near 94.
Clear, with a low around 75.
Sunny, with a high near 95.
Mostly clear, with a low around 75.
Sunny, with a high near 95.
Mostly clear, with a low around 74.
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 93.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jun 27
|
Partly Sunny
|
80°F |
6 mph
E
|
|
Saturday Night
Jun 27
|
Chance Showers And Thunderstorms
|
67°F |
5 to 8 mph
ESE
|
|
Sunday
Jun 28
|
Chance Showers And Thunderstorms then Mostly Sunny
|
90°F |
8 to 15 mph
SSE
|
|
Sunday Night
Jun 28
|
Mostly Clear
|
74°F |
8 to 13 mph
S
|
|
Monday
Jun 29
|
Mostly Sunny
|
92°F |
8 to 15 mph
S
|
|
Monday Night
Jun 29
|
Partly Cloudy
|
76°F |
6 to 14 mph
SSW
|
|
Tuesday
Jun 30
|
Sunny
|
94°F |
6 to 13 mph
SSW
|
|
Tuesday Night
Jun 30
|
Clear
|
75°F |
3 to 14 mph
SSW
|
|
Wednesday
Jul 1
|
Sunny
|
95°F |
3 to 9 mph
SSW
|
|
Wednesday Night
Jul 1
|
Mostly Clear
|
75°F |
2 to 8 mph
S
|
|
Thursday
Jul 2
|
Sunny
|
95°F |
2 to 8 mph
SSW
|
|
Thursday Night
Jul 2
|
Mostly Clear
|
74°F |
1 to 7 mph
SSW
|
|
Friday
Jul 3
|
Sunny then Chance Showers And Thunderstorms
|
93°F |
1 to 6 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Marietta.