Flights from Portsmouth to Jackson lean towards being more expensive in August. Prices are generally better when you fly from Portsmouth to Jackson in March, with the cheapest ticket starting at £675.
At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Southampton and Jackson for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Southampton is roughly less than Jackson. You can assume this to be the case over the next 10 days.
You can imagine temperatures to be in the 34 °C range in July. The weather in Jackson is generally hotter than Southampton's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.