Barometric Pressure in Herrin, United States 
1021.4 hPa
13.7 ℃
75%
0.99 m/s
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The average pressure in Herrin, Illinois, United States today is , which is considered normal. Pressure is trending steady.
Weather prediction: Changeable, mending
The daily total fluctuation in pressure in Herrin is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Herrin hour by hour across the next 6 hourly readings.
The barometric pressure in Herrin, Illinois averages around 30.12 inches. This is slightly above the national average. It often fluctuates between 29.80 and 30.40 inches.
Herrin is located in southern Illinois. The city is surrounded by rolling hills and thick forests. These geographical features can influence the barometric pressure.
The hills can block or redirect air masses. This can cause pressure systems to stagnate or move slowly. As a result, the barometric pressure in Herrin can remain steady for several days.
The forests also play a role in shaping the local weather. They absorb and release moisture, affecting the humidity and atmospheric pressure. This can lead to sudden changes in the barometric pressure.