Petersburg, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Petersburg, IL in one place.
A chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. East wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Petersburg, 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: May 24, 2026 3:21 AM CDT.
The active forecast window currently covers May 26 to May 30, 2026 for Petersburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 3:21 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Petersburg
Thursday looks like the warmest upcoming period in Petersburg at 84 degrees F.
Friday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Friday at about 8 to 13 mph ENE.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 3:21 AM CDT
- Coverage
- 5 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 before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 65. East southeast wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 82. Chance of precipitation is 80%.
Showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 80%.
A chance of rain showers before 7am, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
A slight chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Mostly cloudy, with a low around 56.
Partly sunny, with a high near 78.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
82°F |
5 to 10 mph
E
|
|
Tuesday Night
May 26
|
Chance Showers And Thunderstorms
|
65°F |
6 to 9 mph
ESE
|
|
Wednesday
May 27
|
Showers And Thunderstorms
|
82°F |
8 mph
SE
|
|
Wednesday Night
May 27
|
Showers And Thunderstorms then Chance Showers And Thunderstorms
|
64°F |
7 mph
ESE
|
|
Thursday
May 28
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
84°F |
8 mph
E
|
|
Thursday Night
May 28
|
Chance Showers And Thunderstorms
|
61°F |
7 mph
ENE
|
|
Friday
May 29
|
Chance Showers And Thunderstorms
|
80°F |
8 to 13 mph
ENE
|
|
Friday Night
May 29
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
56°F |
8 to 12 mph
ENE
|
|
Saturday
May 30
|
Partly Sunny
|
78°F |
8 to 12 mph
ENE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Petersburg.