Barometric Pressure in Harrisburg, United States 
1018.7 hPa
11.3 ℃
79%
0.81 m/s
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The average pressure in Harrisburg, Illinois, United States today is , which is considered normal. Pressure is trending falling.
Weather prediction: Occasional rain, worsening
The daily total fluctuation in pressure in Harrisburg is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Harrisburg hour by hour across the next 6 hourly readings.
Harrisburg has a humid climate with four clear seasons. Summers are usually hot and sticky, with many thunderstorms. Winters are cold, but heavy snow is not common every year. Spring and fall bring milder temperatures and quick changes in weather. Rain can fall during any season.
Air pressure patterns often control the weather. Low pressure systems moving from the west can bring clouds, strong winds, thunderstorms, and sometimes tornadoes. High pressure usually brings clearer skies and calmer, drier weather. Cold fronts can cause a fast drop in temperature, especially in spring and fall.
Harrisburg is in southern Illinois, far from large mountains and oceans. This lets cold air from Canada and warm, moist air from the Gulf of Mexico move into the area. The nearby Shawnee Hills can slightly affect winds, clouds, and rainfall. The town's inland location also causes larger changes between summer heat and winter cold.