Barometric Pressure in Portsmouth, United States 
1032.4 hPa
13.3 ℃
21%
1.14 m/s
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The average pressure in Portsmouth, New Hampshire, 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 Portsmouth, often a sign of approaching weather shifts. See the forecast chart or get pressure alerts.
- Rapid Fall : ()
- Rapid Rise : ()
The daily total fluctuation in pressure in Portsmouth is , with a low of and a high of .
Forecast
Hourly Pressure Trends
Track the barometric pressure in Portsmouth hour by hour across the next 6 hourly readings.
The barometric pressure in Portsmouth fluctuates throughout the year. Changes in pressure bring different weather patterns. Low pressure systems lead to cloudy and rainy days. High pressure systems result in clear skies and fair weather.
Portsmouth is situated near the Atlantic Ocean and the Great Bay Estuary. The surrounding water bodies influence the local climate. The city is also bordered by rolling hills to the northwest. These geographic features disrupt airflow patterns, affecting barometric pressure. The combination of ocean and land breezes shape the local weather.
Winters in Portsmouth are cold and snowy. Frigid air from Canada moves southward, bringing chilly temperatures. Spring arrives slowly, with mild air from the ocean. Summers are warm and humid, with occasional heatwaves. Autumns are mild, with gentle breezes from the northwest.