The cost of living in Sussex varies depending on lifestyle and location, but it generally includes several key expenses. Rent for a one-bedroom apartment in the city center of cities like Brighton or Chichester averages around £1,000 to £1,500 per month, while outside the city center, it can range from £800 to £1,200. Utilities, including electricity, heating, cooling, water, and garbage, typically cost between £120 and £180 per month. Internet services are around £30 to £45 monthly. Groceries and food expenses depend on individual preferences, with an average monthly cost for a single person being around £180 to £300. Eating out at inexpensive restaurants costs about £12 to £18 per meal, while mid-range restaurants may charge £25 to £40 per person. Public transportation is relatively accessible, with a monthly pass costing around £60. Additional costs such as entertainment, clothing, and leisure activities can vary widely based on personal preferences and lifestyle choices.

Sussex has a temperate maritime climate characterized by mild winters (1°C to 8°C), warm summers (13°C to 24°C), and moderate rainfall throughout the year. Spring temperatures range from 5°C to 15°C, while autumn temperatures decrease from 15°C to 7°C, with increased rainfall as winter approaches. The region experiences varying sunshine, particularly in summer, though cloudy days are also common. The wettest months typically occur from October to January, while summer tends to be drier, making it a popular time for outdoor activities.

The nearest international airport to Sussex is London Gatwick Airport (LGW). The airport is located approximately 30 miles (48 kilometers) northeast of the county's central areas.