Barometric Pressure
Barometric Pressure in Alton, United States 
0000 hPa
00.0 ℃
00.0 m/s
00.0%
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The pressure in Alton, Illinois, United States is predicted to slowly drop over the next few hours, with an average pressure of 997 hPa today, which is lower than normal.
Weather prediction: Expect more wet and unsettled conditions
The daily total fluctuation in pressure in Alton is 3.9 hPa, with a low of 994.6 hPa and a high of 998.5 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in Alton hour by hour and stay informed about how it will change over the next 6 hours.
Alton, Illinois has changing air pressure because of its location near the Mississippi River and Midwest storms. The city's low elevation near the river means air pressure is often higher in winter and lower in summer. In winter, cold air from Canada brings high pressure, making it colder. In summer, warm humid air from the Gulf of Mexico brings low pressure, making it hotter and more humid. Overall, Alton has a humid continental climate, with big temperature and pressure changes between winter and summer.