Barometric Pressure in Portsmouth, United States 
0000 hPa
00.0 ℃
00.0 m/s
00.0%
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The pressure in Portsmouth, New Hampshire, United States is predicted to drop over the next few hours, with an average pressure of 1005 hPa today, which is lower than normal.
Weather prediction: Expect wet, unsettled weather and a strong breeze
The daily total fluctuation in pressure in Portsmouth is 9.6 hPa, with a low of 999.6 hPa and a high of 1009.2 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in Portsmouth hour by hour and stay informed about how it will change over the next 6 hours.
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.