Saint Joseph, IL Weather Forecast
Local 7-day forecast
Mostly Clear then Patchy Fog
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Joseph, IL in one place.
Patchy fog after 3am. Mostly clear, with a low around 55. East southeast wind around 3 mph.
Local Weather Overview
This forecast page for Saint Joseph, 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: Aug 24, 2026 10:08 PM CDT.
The active forecast window currently covers Aug 24 to Aug 31, 2026 for Saint Joseph, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 31, 2026
- Latest sync
- Aug 24, 2026 10:08 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Joseph
Monday looks like the warmest upcoming period in Saint Joseph at 89 degrees F.
Tonight is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Monday at about 8 to 12 mph SSW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 24, 2026 10:08 PM 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
Patchy fog before 8am. Mostly sunny, with a high near 80. Southeast wind around 3 mph.
Partly cloudy, with a low around 62. Southeast wind around 5 mph.
A slight chance of rain showers between 1pm and 4pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. South southwest wind 5 to 9 mph.
A chance of showers and thunderstorms before 10pm, then a chance of showers and thunderstorms between 10pm and 1am. Mostly clear, with a low around 63. West wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Sunny, with a high near 83. Northwest wind 3 to 7 mph.
Mostly clear, with a low around 61. North wind 2 to 6 mph.
Sunny, with a high near 83.
Mostly clear, with a low around 61.
Mostly sunny, with a high near 84.
Partly cloudy, with a low around 66.
Mostly sunny, with a high near 88.
Partly cloudy, with a low around 70.
A slight chance of rain showers between 7am and 1pm. Mostly sunny, with a high near 89.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
Aug 24
|
Mostly Clear then Patchy Fog
|
55°F |
3 mph
ESE
|
|
Tuesday
Aug 25
|
Patchy Fog then Mostly Sunny
|
80°F |
3 mph
SE
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
62°F |
5 mph
SE
|
|
Wednesday
Aug 26
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
85°F |
5 to 9 mph
SSW
|
|
Wednesday Night
Aug 26
|
Chance Showers And Thunderstorms
|
63°F |
6 mph
W
|
|
Thursday
Aug 27
|
Sunny
|
83°F |
3 to 7 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
61°F |
2 to 6 mph
N
|
|
Friday
Aug 28
|
Sunny
|
83°F |
5 mph
NNE
|
|
Friday Night
Aug 28
|
Mostly Clear
|
61°F |
3 mph
E
|
|
Saturday
Aug 29
|
Mostly Sunny
|
84°F |
5 mph
SE
|
|
Saturday Night
Aug 29
|
Partly Cloudy
|
66°F |
6 mph
SSE
|
|
Sunday
Aug 30
|
Mostly Sunny
|
88°F |
6 to 10 mph
S
|
|
Sunday Night
Aug 30
|
Partly Cloudy
|
70°F |
8 mph
S
|
|
Monday
Aug 31
|
Slight Chance Rain Showers
|
89°F |
8 to 12 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Joseph.