Pittsburg, IL Weather Forecast
Local 7-day forecast
Sunny then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Pittsburg, IL in one place.
A slight chance of showers and thunderstorms after 5pm. Sunny, with a high near 91. Heat index values as high as 103. West wind 3 to 9 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Pittsburg, 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 17, 2026 5:13 PM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Pittsburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 5:13 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Pittsburg
Tuesday looks like the warmest upcoming period in Pittsburg at 93 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 12 mph W.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 5:13 PM CDT
- Coverage
- 6 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
A chance of showers and thunderstorms before 3am. Partly cloudy, with a low around 73. Heat index values as high as 100. West wind 1 to 7 mph. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Northeast wind around 3 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 69. Chance of precipitation is 20%.
Sunny, with a high near 91.
Mostly clear, with a low around 75.
Mostly sunny, with a high near 93.
Mostly clear, with a low around 69.
Sunny, with a high near 82.
Mostly clear, with a low around 63.
Mostly sunny, with a high near 82.
Partly cloudy, with a low around 64.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
3 to 9 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
73°F |
1 to 7 mph
W
|
|
Sunday
Jul 19
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
89°F |
3 mph
NE
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
69°F |
2 mph
NE
|
|
Monday
Jul 20
|
Sunny
|
91°F |
1 to 5 mph
S
|
|
Monday Night
Jul 20
|
Mostly Clear
|
75°F |
6 mph
S
|
|
Tuesday
Jul 21
|
Mostly Sunny
|
93°F |
5 to 12 mph
W
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
69°F |
6 to 12 mph
N
|
|
Wednesday
Jul 22
|
Sunny
|
82°F |
6 to 10 mph
N
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
63°F |
1 to 8 mph
N
|
|
Thursday
Jul 23
|
Mostly Sunny
|
82°F |
3 mph
N
|
|
Thursday Night
Jul 23
|
Partly Cloudy
|
64°F |
2 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Pittsburg.