Rio Alto Beach
Nude beach in Porto, Portugal · also known as Praia Rio Alto Naturista
Rio Alto Beach is a clothing-optional beach in Porto, Portugal. The sea is warmest in August at about 17°C (63°F) and coolest in February (13°C (56°F)). Average air temperatures peak in August at 21°C (69°F). EU monitoring rated the bathing water "Excellent" in 2025. There are 4 other naturist places within 50 km (31 mi), the closest being Praia Rodanho - zona de Naturista tolerado (24 km (15 mi)).
Weather and water temperature at Rio Alto Beach
Tap a month. Averages: air 2001–2025 (NASA POWER), sea 1991–2020 (NOAA OISST).
| Month | Air | Sea | Rain |
|---|---|---|---|
| January | 10°C | 14°C | 141 mm |
| February | 10°C | 13°C | 95 mm |
| March | 12°C | 14°C | 117 mm |
| April | 13°C | 14°C | 91 mm |
| May | 16°C | 16°C | 64 mm |
| June | 19°C | 17°C | 37 mm |
| July | 20°C | 17°C | 17 mm |
| August | 21°C | 17°C | 26 mm |
| September | 20°C | 17°C | 49 mm |
| October | 17°C | 17°C | 141 mm |
| November | 13°C | 16°C | 142 mm |
| December | 10°C | 15°C | 131 mm |
Not sure what the numbers mean? Here is how warm is warm enough to swim.
Visiting
- Bathing water profile: ESTELA-BARRANHA
- Coordinates: 41.44510, -8.77938 · OpenStreetMap
- Local law: is public nudity legal in Portugal?
- Before you go, read our nude beach etiquette guide.
- First time? Read our guide to your first time at a nude beach.
Naturist places near Rio Alto Beach
- 1Praia Rodanho - zona de Naturista tolerado nude beach · Viana do CasteloClothing optionalSea 17°C in August
- 2NaturViana naturist campground · Viana do CasteloCustomary
- 3Lima Nature naturist campground · Viana do CasteloNaturist only
- 4Praia de Afife nude beach · Viana do CasteloClothing optionalSea 17°C in August
- 5Os Muiños nude beach · PontevedraClothing optionalSea 17°C in August
- 6A Noiva nude beach · PontevedraListedSea 17°C in August
- 7Fontaíña Beach nude beach · PontevedraClothing optionalSea 17°C in August
- 8Baluarte nude beach · PontevedraClothing optionalSea 17°C in August
Status labels: Official · Naturist only · Clothing optional · Tolerated · Customary · Listed · Prohibited · Closed. Statuses come from open data and are not yet verified in person.
Frequently asked questions
Is Rio Alto Beach clothing optional?
Rio Alto Beach is listed as "clothing optional" according to OpenStreetMap (nudism=allowed). Rules can change, and clothing-optional zones are often only part of a beach, so look for signs on arrival and follow local rules. NudistMap has not yet verified this status in person. You can check what applies in Portugal before you go.
How warm is the water at Rio Alto Beach?
Long-term sea surface temperatures (NOAA OISST, 1991–2020) range from 13°C (56°F) to 17°C (63°F) in August. Water at the shore can be a few degrees different.
Is the water clean at Rio Alto Beach?
The nearest EU-monitored bathing site (ESTELA-BARRANHA) was rated "Excellent" for the 2025 season under the EU Bathing Water Directive.
What other naturist places are near Rio Alto Beach?
The closest are Praia Rodanho - zona de Naturista tolerado (24 km (15 mi)), NaturViana (26 km (16 mi)) and Lima Nature (28 km (17 mi)).
Sources
Status from OpenStreetMap (nudism=allowed). Not yet verified against an official source; local rules may have changed. Data updated 2026-10-31. Wikipedia · Wikidata Q5405017 · All data sources and licenses. © OpenStreetMap contributors.