Pittsburg, IL Weather & Growing Conditions
Overnight
72°F
Mostly Clear
Mostly clear. Low around 72, with temperatures rising to around 74 overnight. South wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 72°F | Mostly Clear | 2 mph S | 2% |
| Saturday | 99°F | Sunny | 2 to 9 mph SW | 2% |
| Saturday Night | 73°F | Mostly Clear | 5 mph SSW | 1% |
| Sunday | 97°F | Mostly Sunny | 5 to 8 mph WSW | 0% |
| Sunday Night | 69°F | Mostly Cloudy then Chance Showers And Thunderstorms | 6 mph N | 25% |
| Monday | 86°F | Showers And Thunderstorms Likely | 5 to 12 mph NNE | 59% |
| Monday Night | 61°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 to 12 mph NNE | 59% |
| Tuesday | 76°F | Chance Showers And Thunderstorms | 8 to 13 mph N | 31% |
| Tuesday Night | 57°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 13 mph N | 17% |
| Wednesday | 76°F | Mostly Sunny | 7 to 10 mph N | 2% |
| Wednesday Night | 56°F | Partly Cloudy | 3 to 10 mph N | 1% |
| Thursday | 77°F | Mostly Sunny | 3 to 10 mph N | 3% |
| Thursday Night | 58°F | Partly Cloudy | 2 to 9 mph NNE | 4% |
| Friday | 78°F | Mostly Sunny | 3 to 10 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Pittsburg, IL
Last spring frost
Apr 7
First fall frost
Oct 26
Growing season
202 days
Hardiness zone
7a
Explore more for Pittsburg, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Harrisburg, Il (15.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.