Ranked: where Madrid swims (1–5)
1. Pantano de San Juan — "the beach of Madrid": the only reservoir in the region where swimming is officially authorised, with sandy coves, blue-flag bathing at Virgen de la Nueva, boat and paddle-surf hire, and beach bars. About an hour west by car, or bus from Príncipe Pío toward San Martín de Valdeiglesias.
2. Las Presillas de Rascafría — three walled river pools in a mountain meadow below the Lozoya pines, with Peñalara as the backdrop. Icy, gorgeous, small summer fee; combine with the monastery of El Paular next door.
3. Riosequillo (Buitrago del Lozoya) — the sierra’s giant lido: one of Europe’s largest open-air pools, lawns and mountain views, ten minutes from Buitrago’s walled old town. The family-logistics winner.
4. Playa fluvial de Aldea del Fresno — a genuine river beach on the Alberche: shallow, tree-lined and picnic-friendly, the closest thing to a lazy Sunday at the seaside without leaving the region.
5. Las Berceas (Cercedilla) — pine-shaded pools at the mouth of the Fuenfría valley: swim, then walk the Roman road, then the trailhead menú. The hiker’s double bill.
Ranked: where Madrid swims (6–10)
6. The municipal pools — Madrid runs dozens of outdoor pools from roughly mid-May to mid-September at neighbourhood prices; the Casa de Campo lido is the flagship. The everyday answer to a 38° afternoon.
7. Madrid Río’s urban beach — free water jets and shallow play fountains along the Manzanares, engineered for children and heat waves, with the Río’s pools and lawns around it.
8. Hotel rooftop pools — several central hotels sell summer day passes; paired with a cheap room elsewhere, it is the budget version of the five-star summer.
9. The Lozoya valley picnic rivers — designated bathing stretches near Rascafría fill with families in August; arrive by 11:00 for shade and a pool of your own.
10. The honourable warning: La Pedriza’s famous granite charcas are now a no-swimming zone (the regional park enforces it in season). Look, photograph, and swim at numbers 1–9 instead.
The playbook
Timing beats location: August weekends demand a 10:00 arrival anywhere on this list; September weekdays are the connoisseur’s season, warm water and empty sand. Mountain pools (Presillas, Berceas) run cold all summer — that is the feature.
Without a car you still swim well: municipal pools and Madrid Río by metro, Cercedilla and Buitrago-adjacent Riosequillo by Cercanías and bus, San Juan by interurban bus. Sleeping a night in Cercedilla or Buitrago turns the swim into a full sierra weekend — hotels run from around €45.
Questions, answered
Hotels in Madrid
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