Saint Peter, IL Weather Forecast
Local 7-day forecast
Clear
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Peter, IL in one place.
Clear, with a low around 69. North wind around 1 mph.
Local Weather Overview
This forecast page for Saint Peter, 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: Jul 15, 2026 5:13 AM CDT.
The active forecast window currently covers Jul 15 to Jul 21, 2026 for Saint Peter, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 15 to Jul 21, 2026
- Latest sync
- Jul 15, 2026 5:13 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Peter
Monday looks like the warmest upcoming period in Saint Peter at 91 degrees F.
Overnight is the coolest period ahead with temperatures near 69 degrees F.
The strongest winds are forecast for Tuesday at about 6 to 12 mph NW.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 15, 2026 5:13 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KVWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Sunny, with a high near 90. Northeast wind 0 to 3 mph.
Mostly clear, with a low around 72. Southeast wind 0 to 3 mph.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Heat index values as high as 100. South wind 0 to 3 mph. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72. Southwest wind around 3 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 87. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 70%.
A slight chance of showers and thunderstorms. Sunny, with a high near 90. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 73. Chance of precipitation is 20%.
Sunny, with a high near 89.
Mostly clear, with a low around 71.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. Chance of precipitation is 20%.
Mostly sunny, with a high near 87.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 15
|
Clear
|
69°F |
1 mph
N
|
|
Wednesday
Jul 15
|
Sunny
|
90°F |
0 to 3 mph
NE
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
72°F |
0 to 3 mph
SE
|
|
Thursday
Jul 16
|
Mostly Sunny then Chance Showers And Thunderstorms
|
89°F |
0 to 3 mph
S
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms
|
72°F |
3 mph
SW
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
87°F |
1 to 6 mph
W
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
72°F |
1 to 5 mph
W
|
|
Saturday
Jul 18
|
Slight Chance Showers And Thunderstorms
|
90°F |
5 to 10 mph
W
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
73°F |
3 to 8 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
89°F |
6 mph
W
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
71°F |
5 mph
S
|
|
Monday
Jul 20
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
2 to 9 mph
SW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
73°F |
8 mph
W
|
|
Tuesday
Jul 21
|
Mostly Sunny
|
87°F |
6 to 12 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Peter.