Water sports
One of the best surf coasts in Europe is on your doorstep. June water is 17–19 °C — a shortie wetsuit is your friend. Mornings glassy, afternoons windy. Plan around it.
June water. Sea temperature 17–19 °C. Mornings are calm and clean; the nortada (north wind) kicks in early afternoon, brilliant for sailing and kite, miserable for SUP.
The broad, sandy-bottom beach two train stops east. Forgiving, lifeguarded, and lined with surf schools — Carcavelos Surf School and Angels Surf School both run group lessons in English, June through September.
Practical: 2 hr group lesson ~€35. Train from Cascais to Carcavelos.
World-class kitesurfing and windsurfing in the afternoon. Surfable in the morning when the wind is down. Cold, raw, and beautiful — this is the wild beach. Not the place for absolute beginners.
Practical: Moana surf school for lessons; Beach Rider for kite.
The sheltered bay in front of town is ideal for stand-up paddle — flat, warm-ish, no swell. Rent a board from one of the seafront kiosks, paddle west to the lighthouse and back. About 90 minutes.
Practical: ~€15/hour. Go before 11 am for glass.
A two-hour guided sea-kayak tour along the cliffs to Boca do Inferno and back. Different (and better) view than from land — and you'll see caves only reachable from the water.
Practical: book the morning slot; afternoon wind kills it.
Cascais is a serious sailing town — Olympic training base, regatta calendar. Charter a half-day skippered sail in the bay for ~€60 pp; or take a Royal Yachting Association course if you're staying a couple of weeks.
Practical: Try CNC (Clube Naval de Cascais) for entry-level options.
A small protected reef one train stop east. Visibility is moderate (5–10 m), the marine life surprising — octopus, moray, stingrays. Dive centres in Cascais do guided two-tank trips.
Practical: bring a wetsuit; PADI Open Water cert required.