Rhode Island
Pretty quiet out there — 1-2ft and mostly poor with 10mph from the SW.
Pretty quiet out there — 1-2ft and mostly poor with 10mph from the SW.
Best window·Monday 9AM–12PM·2-3ft·Good
Here's how the next 5 days are shaping up at Mansion Beach, Rhode Island. Each day is rated based on breaking wave height, swell period, and wind — updated hourly from the latest NOAA GFS run.
Thu, Sep 3: 1–2ft, 7s period, rated Poor. Midday is the call — 1-2ft waves with 10mph from the SW and poor conditions. It's a bit wonky first thing but settles down.
Fri, Sep 4: 1–2ft, 8s period, rated Poor - Fair. First light looks cleanest — 1-2ft on SSW swell at 4s with 8mph WNW winds. Wind fills in through the day, pushing up to 12mph from the WSW and dropping conditions to poor.
Sat, Sep 5: 1–2ft, 4s period, rated Very Poor. Midday is the call — 1-2ft waves with 13mph NNE winds and poor conditions. It's a bit wonky first thing but settles down.
Sun, Sep 6: 2–3ft, 4s period, rated Very Poor. Expect 1-2ft waves early on NE swell at 4s.
Mon, Sep 7: 2–3ft, 10s period, rated Poor - Fair. The sweet spot is around midday — 2-3ft waves, 7mph from the NW, fair - good conditions. Morning is a bit bumpy but things clean up by late morning. Don't wait too long — the wind comes back up after lunch.
Two days at a glance. Swipe for later hours.Five days at a glance. Drag for later hours.
Poor today — get one free email when Mansion Beach turns Good.
Check Mansion Beach from the lineup
Forecasts, surf alerts, and live conditions in the Swell Intel iPhone app.
Mansion Beach is a scenic stretch of shoreline on Block Island, Rhode Island, facing west-northwest into Block Island Sound and offering fun, punchy beach break when south swells wrap around the island's southern tip. The unique geography of Block Island means this spot picks up long-period S and SSW swells that refract around the coast, producing surprisingly consistent peaks with good shape for intermediate surfers. Its relative remoteness — requiring a ferry ride from the Rhode Island mainland — keeps crowds manageable and adds to the adventure of scoring it on the right day.
Wave heights shown are breaking wave heights — the actual rideable wave size at this spot.
The current wave height at Mansion Beach is 1-2ft with a 6.2s swell period. Wind is SW at 10mph. Conditions are rated Poor. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Mansion Beach is 1-2ft, produced by a 2.2ft SE wind swell swell at 6s, a 1.4ft SE secondary swell at 9s. Breaking wave height is the actual rideable wave size at the shore — calculated from offshore swell data using this spot's coastal bathymetry — not the raw buoy reading.
Based on the current 5-day forecast, the best window to surf Mansion Beach is Monday from 9 AM to 12 PM with 2ft waves, a 10s swell period, and conditions rated Good. Check the hourly forecast for updates as conditions can shift.
Mansion Beach works best with a S swell and WNW winds. Offshore winds groom the face of the wave, while onshore winds turn it sloppy. Cross-offshore conditions usually produce the cleanest shape.
Tide plays a big role at Mansion Beach. Mid tide works for most beach breaks, while reef and point breaks often prefer higher or lower stages. Use the tide chart above to line up your session with the swell peak.
Mansion Beach is a beach with a sand bottom, suited to intermediate surfers. Mansion Beach is a scenic stretch of shoreline on Block Island, Rhode Island, facing west-northwest into Block Island Sound and offering fun, punchy beach break when south swells wrap around the island's southern tip. The unique geography of Block Island means this spot picks up long-period S and SSW swells that refract around the coast, producing surprisingly consistent peaks with good shape for intermediate surfers. Its relative remoteness — requiring a ferry ride from the Rhode Island mainland — keeps crowds manageable and adds to the adventure of scoring it on the right day.
The prime season at Mansion Beach is fall, when swell direction, wind patterns, and water temps line up most consistently. Outside the peak season you can still score, but you'll need to watch the forecast closely for the right windows.
Common hazards at Mansion Beach include strong currents, rip currents, ferry traffic nearby, rocks at edges of beach, remote location limits emergency access. Always check conditions before paddling out, respect local etiquette, and never surf alone if you're unfamiliar with the break.
Our Mansion Beach forecast uses NOAA GFS and other weather models combined with spot-specific bathymetry to calculate breaking wave heights. Short-range (1-3 day) forecasts are most reliable; extended forecasts show general trends. We also verify our offshore swell predictions against NOAA buoy measurements daily — see our accuracy page for those swell-verification metrics (buoys measure open-water swell, not breaking surf size).
