Barometric Pressure in Johnston, United States 
1024.3 hPa
19.6 ℃
58%
3.61 m/s
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The average pressure in Johnston, Iowa, United States today is , which is higher than normal. Pressure is trending rising.
Weather prediction: Fairly fine, possible showers early
Rapid Pressure Changes
Rapid pressure changes detected in Johnston, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Rise : ()
The daily total fluctuation in pressure in Johnston is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Johnston hour by hour across the next 6 hourly readings.
Johnston's weather is influenced by its location in the Midwest, where warm air from the Gulf of Mexico meets cool air from Canada, causing changing air pressure.
The city's geography, with Iowa's flat plains and few obstacles, allows winds to move freely, affecting air pressure and weather patterns.
In the winter, cold air from Canada brings low pressure, resulting in cold and snowy weather, while in the summer, warm air from the Gulf brings high pressure, leading to hot and humid weather.
Johnston has a humid continental climate, which means it experiences large temperature and pressure changes between winter and summer, with a moderate climate overall.