Petersburg, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Petersburg, IL in one place.
Sunny, with a high near 62.
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 15, 2026 1:54 PM CDT.
The active forecast window currently covers Apr 19 to Apr 21, 2026 for Petersburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 19 to Apr 21, 2026
- Latest sync
- Apr 15, 2026 1:54 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Petersburg
Tuesday looks like the warmest upcoming period in Petersburg at 76 degrees F.
Sunday Night is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Sunday at about 8 to 13 mph W.
The forecast from Apr 19 through Apr 21 stays mostly dry.
Forecast Details
- Last updated
- Apr 15, 2026 1:54 PM CDT
- Coverage
- 3 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
Clear, with a low around 40.
Sunny, with a high near 70.
Mostly clear, with a low around 49.
Mostly sunny, with a high near 76.
Partly cloudy, with a low around 57.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Apr 19
|
Sunny
|
62°F |
8 to 13 mph
W
|
|
Sunday Night
Apr 19
|
Clear
|
40°F |
5 to 8 mph
N
|
|
Monday
Apr 20
|
Sunny
|
70°F |
6 to 10 mph
S
|
|
Monday Night
Apr 20
|
Mostly Clear
|
49°F |
9 mph
S
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
76°F |
8 to 13 mph
SW
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
57°F |
7 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Petersburg.
