Petersburg, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Petersburg, IL in one place.
Showers and thunderstorms before 4pm. Mostly cloudy, with a high near 63. Northwest wind around 12 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter 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: Apr 9, 2026 3:19 PM CDT.
The active forecast window currently covers Apr 10 to Apr 15, 2026 for Petersburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 10 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 3:19 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Petersburg
Tuesday looks like the warmest upcoming period in Petersburg at 84 degrees F.
Friday Night is the coolest period ahead with temperatures near 43 degrees F.
The strongest winds are forecast for Sunday at about 14 to 21 mph S.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 3:19 PM CDT
- Coverage
- 6 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
Partly cloudy, with a low around 43. Northeast wind around 8 mph, with gusts as high as 16 mph. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers after 7am. Mostly cloudy, with a high near 66. East southeast wind around 12 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
A slight chance of rain showers before 7pm. Mostly cloudy, with a low around 58. South southeast wind 10 to 14 mph, with gusts as high as 24 mph.
A chance of rain showers after 1pm. Mostly cloudy, with a high near 76. South wind 14 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Rain showers likely before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Showers and thunderstorms likely. Mostly cloudy, with a high near 84.
Showers and thunderstorms likely. Mostly cloudy, with a low around 62.
Showers and thunderstorms likely. Partly sunny, with a high near 78.
A chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Apr 10
|
Showers And Thunderstorms
|
63°F |
12 mph
NW
|
|
Friday Night
Apr 10
|
Partly Cloudy
|
43°F |
8 mph
NE
|
|
Saturday
Apr 11
|
Chance Rain Showers
|
66°F |
12 mph
ESE
|
|
Saturday Night
Apr 11
|
Slight Chance Rain Showers then Mostly Cloudy
|
58°F |
10 to 14 mph
SSE
|
|
Sunday
Apr 12
|
Mostly Cloudy then Chance Rain Showers
|
76°F |
14 to 21 mph
S
|
|
Sunday Night
Apr 12
|
Showers And Thunderstorms Likely
|
62°F |
15 to 18 mph
SSW
|
|
Monday
Apr 13
|
Rain Showers Likely then Chance Showers And Thunderstorms
|
82°F |
14 to 17 mph
SSW
|
|
Monday Night
Apr 13
|
Chance Showers And Thunderstorms
|
66°F |
16 mph
SSW
|
|
Tuesday
Apr 14
|
Showers And Thunderstorms Likely
|
84°F |
14 to 18 mph
SSW
|
|
Tuesday Night
Apr 14
|
Showers And Thunderstorms Likely
|
62°F |
16 mph
SSW
|
|
Wednesday
Apr 15
|
Showers And Thunderstorms Likely
|
78°F |
14 to 17 mph
SW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
54°F |
10 to 14 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Petersburg.