Pittsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pittsburg, a village in Williamson County, Illinois.
This Afternoon
79°F
Partly Sunny
Partly sunny. High near 79, with temperatures falling to around 76 in the afternoon. South wind around 20 mph, with gusts as high as 30 mph.
7-day forecast for Pittsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Partly Sunny | 20 mph S | 9% |
| Tonight | 56°F | Showers And Thunderstorms | 8 to 17 mph S | 98% |
| Wednesday | 69°F | Partly Sunny | 6 to 12 mph WSW | 10% |
| Wednesday Night | 44°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 69°F | Sunny | 2 to 9 mph SW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph W | 5% |
| Friday | 62°F | Partly Sunny | 3 to 10 mph NNW | 5% |
| Friday Night | 39°F | Mostly Cloudy | 2 to 7 mph NNW | 1% |
| Saturday | 58°F | Partly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 63°F | Sunny | 0 to 8 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 65°F | Sunny | 1 to 9 mph W | 2% |
| Monday Night | 38°F | Mostly Clear | 5 mph SW | 0% |
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
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Johnston City
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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 Nov 3, 2026.