Barometric Pressure
Barometric Pressure in Alton, United States 
1018.6 hPa
18.3 ℃
47%
0.51 m/s
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The average pressure in Alton, Illinois, United States today is , which is considered normal. Pressure is trending rising.
Weather prediction: Fairly fine, improving
Rapid Pressure Changes
Rapid pressure changes detected in Alton, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Rise : ()
- Rapid Rise : ()
The daily total fluctuation in pressure in Alton is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Alton hour by hour across the next 6 hourly readings.
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.