Sussex Coast (Brighton, Eastbourne and Selsey)

May through September offers the easiest balance of active charter schedules, longer daylight and warmer water. Late summer can reach roughly 16°C to 19°C, although visibility is not guaranteed. Experienced drysuit divers can add April and October, especially for local charters and shore dives. November through March is not a formal closure, but exposed Channel trips are less dependable and water can approach 5°C to 9°C. Always let wind, swell, recent rainfall, tide and the operator's local report override the calendar.

Sussex is a cold-water destination. Indicative sea temperatures range from about 5°C to 9°C in late winter to roughly 16°C to 19°C in late summer. Many local divers use a drysuit for most or all of the year because it protects both underwater and during windy surface intervals. A well-fitted 7mm wetsuit can work for some summer divers on a single shallow dive, but repetitive boat days favor a drysuit, hood and gloves. Practice buoyancy and emergency procedures before joining a tidal wreck charter.

Yes, but site selection matters. Selsey East Beach, Inner Mulberry and selected shallow guided dives can support training or supervised Open Water divers when tide and visibility are favorable. Brighton and Eastbourne also have shallower reefs and wrecks, yet many celebrated offshore sites lie beyond 20 m and involve current, a shotline, low visibility or decompression exposure. Independent visitors should be comfortable with cold-water equipment, buoyancy, close buddy contact and DSMB deployment. Ask the operator to match the actual day's site to your certification, recent experience and maximum comfortable depth rather than booking only by wreck name.

Visibility is one of the coast's least predictable variables. Local operators describe days with only a few metres and good spells exceeding 10 m. Wind direction, swell, plankton, rainfall, seabed type and the number of divers can matter more than the month. Chalk and wreck sites may look excellent until poor fin technique lifts fine sediment. Carry a torch, keep close buddy contact and avoid touching down. Snorkelers should ask a guide for a same-day report and choose a calm, shallow Selsey route rather than assuming a sunny beach means clear or safe water.

Many Sussex wrecks and Selsey sites become practical only during a relatively short slack-water period. The useful time does not always match a simple high-water or low-water rule, and offshore slack can differ from the nearest beach prediction. The skipper calculates the shot and descent around the chosen site, current and day's tide. Be fully dressed, analyzed and ready before the briefing deadline. Missing the descent can mean missing the dive. On ascent, deploy the DSMB according to the boat procedure so surface cover can track you if current returns away from the shotline.

Choose the base that matches the main activity. Brighton is best for a car-free city stay, training support and charters from Brighton Marina. Eastbourne is strongest for major wrecks such as Alaunia and Oceana, plus the Royal Sovereign Shoals and easy access to Seven Sisters. Selsey is the most varied shallow-water cluster, with shore diving, guided drifts, Mixon Hole, Mulberry remains, snorkeling and freediving. The hubs are not interchangeable morning departure points. Combining all three works best with a rental car, multiple nights and a weather reserve day rather than one central hotel and long daily transfers.

Yes, but use coached or guided formats. Ocean View Diving Services and NoTanx support Brighton-area freedive training, including pools, while Mulberry Marine Experiences connects freediving and snorkeling with Selsey shore knowledge. East Beach is the clearest mixed-use starting point, commonly shallow to about 5 m. Cold water, chop, current, vessel traffic and low visibility make solo breath-hold activity unacceptable. Use one-up, one-down supervision, a visible float and enough thermal protection for long surface intervals. June through September is the strongest sea window; pool training remains the reliable year-round option.

Some sites have legal controls beyond normal recreational diving. A designated protected-wreck area can require a licence for diving, surveying, excavation, recovery or anchoring, and Norman's Bay is commonly visited through licensed archaeological access. Selsey's D-Day tanks and armoured bulldozers are a Scheduled Monument. Non-contact observation is different from intrusive work, but attachment, excavation, movement, recovery or damage can require consent and may be an offence without it. Use an operator who understands the site's status, follow no-touch and no-take rules, and report any wreck material recovered elsewhere to the Receiver of Wreck within 28 days.

Gatwick is the most practical airport for Brighton and Eastbourne. The airport publishes direct rail travel of about 30 minutes to Brighton and about 1 hour to Eastbourne, subject to the timetable and engineering work. For Selsey, take a train through Gatwick to Chichester, then continue by local bus, taxi or rental car for the final roughly 13 km. Dive boats leave from marinas rather than mainline stations, so include a gear-friendly last-mile transfer. Groups carrying drysuits, cylinders or several bags may find a pre-booked vehicle or rental car simpler than peak-time trains.

Wrecks and reefs commonly support conger eels, lobsters, brown crabs, wrasse, pout, bass, anemones, sponges and nudibranchs. Sussex chalk habitats can also hold tompot blennies, boring organisms and short-snouted seahorses, although seahorse encounters should never be expected. The clearest seasonal objective is common cuttlefish: Sussex IFCA records an inshore breeding period from May through August between Fairlight, Beachy Head, Brighton and the Solent region. Move slowly, keep neutral buoyancy and do not chase, touch or block breeding animals. Wildlife density often rewards a macro lens and deliberate torch work more than wide-angle expectations.

Brighton offers the Royal Pavilion, museums, independent streets and a long seafront without needing a car. From Eastbourne, non-divers can combine Towner Eastbourne with the promenade or use good weather for Seven Sisters and Cuckmere Haven. Selsey pairs with Pagham Harbour and Medmerry, where signed trails offer summer terns, winter wildfowl and wide coastal landscapes. Chichester adds cathedral heritage and theater. Match the backup to the departure hub, keep bookings flexible and avoid exposed cliff routes when wind or visibility is poor. A cancellation can still become a full destination day rather than lost time.

For a life-threatening or maritime emergency, call 999 or 112 and ask for the Coastguard when the incident is at sea or on the coast. For suspected decompression illness, arterial gas embolism or another diving injury, the British Hyperbaric Association Diving Accident Helpline is 07831 151523 and operates 24 hours. Give oxygen if trained, keep the diver at rest, preserve dive-computer and gas information and follow specialist instructions. Do not self-drive to an assumed chamber. Royal Sussex County Hospital, Eastbourne District General Hospital and St Richard's Hospital provide local emergency assessment, but chamber referral should be coordinated by diving-medicine specialists.

Bring a drysuit with suitable undergarments, hood and gloves, cold-water regulators, a DSMB with reel or spool, primary and backup lights, a compass and at least one accessible cutting tool. Technical or planned-decompression dives require an appropriate redundant-gas configuration and formal training. Boots should cope with shingle entries, and a warm boat coat or changing robe reduces surface chill. Add seasickness medication, a dry bag and spare drysuit seals or repair materials. Confirm cylinder pressure, valve type, weights, nitrox or trimix availability and fill timing with the operator before travel rather than relying on marina walk-in stock.

No. Sussex is best classified as a local-only destination. The normal trip shape is a hotel, guesthouse or home base combined with dive schools, clubs, shore guides and day-charter boats from Brighton Marina, Sovereign Harbour or Selsey. A vessel may carry divers for a full day, but that does not create a liveaboard route. Staying ashore also gives the flexibility needed for weather cancellations, gear servicing and separate topside plans. Book the harbor and operator that fit your qualification, then add one or more reserve days instead of looking for a multi-night boat itinerary.