Pittsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pittsburg, a village in Williamson County, Illinois.
Today
88°F
Sunny
Sunny, with a high near 88. East wind 0 to 5 mph.
7-day forecast for Pittsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 0 to 5 mph E | 0% |
| Tonight | 64°F | Mostly Clear | 0 to 3 mph E | 0% |
| Wednesday | 91°F | Sunny | 0 to 3 mph SSW | 0% |
| Wednesday Night | 69°F | Mostly Clear | 2 mph S | 3% |
| Thursday | 90°F | Chance Showers And Thunderstorms | 2 to 8 mph SSW | 25% |
| Thursday Night | 71°F | Slight Chance Showers And Thunderstorms | 1 to 6 mph S | 57% |
| Friday | 90°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 7 mph SW | 57% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph SSW | 38% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 38% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SSW | 17% |
| Sunday | 92°F | Sunny | 3 to 10 mph SSW | 8% |
| Sunday Night | 72°F | Mostly Clear | 3 to 10 mph SSW | 5% |
| Monday | 94°F | Sunny | 5 to 12 mph SSW | 5% |
| Monday Night | 74°F | Mostly Clear | 5 to 10 mph SSW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Pittsburg (37.777, -88.850). Updated through the day.
Growing snapshot for Pittsburg
Last spring frost
Apr 7
First fall frost
Oct 26
Growing season
202 days
Hardiness zone
7a
More local growing data for Pittsburg: nearby ZIP 62974 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Blairsville
Bush
Cambria
Carterville
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Crab Orchard
Crainville
Creal Springs
Energy
Freeman Spur
Herrin
Hurst
Johnston City
Marion
Spillertown
Whiteash
Climate data from the nearest NOAA station, Harrisburg, Il (15.1 mi from Pittsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.