Cheap flights to Portsmouth, NH
Flights to Portsmouth, NH in 2025
Find the latest flights to Portsmouth in 2025, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 411,093 searches and data was last updated on February 17, 2025.
Best time to book a flight to Portsmouth
Have a flexible travel schedule? Discover the best time to fly to Portsmouth with our price prediction graph.
Travel insights for flights to Portsmouth
Get recent, data-driven insights about flights to Portsmouth including ideal travel times, pricing trends, and more.
Rainfall in Portsmouth by month
Plan your trip to Portsmouth by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Portsmouth ranges from 57.0 - 129.0 inches per month. November is typically the wettest month, when rainfall can reach 129.0 mm. August is typically the driest time to visit Portsmouth when rainfall is around 57.0 mm.
Temperature in Portsmouth by month
Plan your trip to Portsmouth by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Portsmouth, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travelers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -4.0 C).
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