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Shore entry

Harborview Beach

Massachusetts, United StatesDirections
Open Water suggested2–6 m (5–20 ft) depthShore entry7mm or semi-dry + hood typical

Harborview Beach at a glance

Harborview Beach is a shore dive site in Massachusetts, United States with depths of 1.5–6.1 m (5–20 ft). Typically most favorable Jul–Aug · from 3 years of archive data. Divers commonly see Striped bass, Winter flounder, and Cunner. Recent reports put the water around 13°C (55°F). Check the latest conditions and entry details before you go.

Favorable window now· until 18:00 · sunset 17:44

Forecast for this hour · 17:00 · run 15 h ago
0.3 m (1.1 ft)waves — under half a meter expected (waves — about a foot expected)

Tap a factor for its source and model point · Forecast 13°C · seasonal avg 15°C ( · Forecast 55°F · seasonal avg 59°F)

Site hazards: Fishermen casting from the breakwater (entanglement in monofilament); boat traffic entering and leaving Sesuit Harbor just beyond the breakwater; cold water; very shallow at low tide.

Read the full hazards ↓

Dive windows this week

Sun3:00–18:00 favorable

0.4 m waves · 5 kn wind (1.2 ft waves · 5 kn wind)

Mon8:00–18:00 favorable, 20:00–21:00 moderate, 22:00–0:00 moderate

0.3 m waves · 11 kn wind (1.0 ft waves · 11 kn wind)

Tue8:00–11:00 moderate, 12:00–17:00 moderate, 17:00–18:00 favorable

1.0 m waves · 13 kn wind (3.3 ft waves · 13 kn wind)

Wed1:00–4:00 moderate, 5:00–6:00 moderate, 8:00–18:00 favorable

0.5 m waves · 5 kn wind (1.7 ft waves · 5 kn wind)

ThuNo window

0.4 m waves · 10 kn wind (1.4 ft waves · 10 kn wind)

Fri8:00–22:00 favorable

0.2 m waves · 8 kn wind (0.7 ft waves · 8 kn wind)

Sat8:00–0:00 favorable

0.5 m waves · 9 kn wind (1.7 ft waves · 9 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 6:36 · Sunrise 7:04 · Sunset 17:44 · some windows run past sunset

Source: Open-Meteo marine · model point 14 km from site · updated 25 Oct, 01:22 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Harborview Beach

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

What Divers Say

Known for: Winter flounder, Cunner, American lobster
Best time: Within an hour of high tide, evenings (after the 4 PM parking restriction lifts) make it a popular dusk/night dive; calm southwest winds are ideal.

Based on community reviews and site data. Conditions vary — always verify before diving.

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. January, 32% of days have historically been favorable, water has typically been 5°C (42°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 24 knots
  2. February, 25% of days have historically been favorable, water has typically been 4°C (38°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 24 knots
  3. March, 29% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 1.4 m (4.7 ft), wind has typically been 24 knots
  4. April, 52% of days have historically been favorable, water has typically been 7°C (45°F), waves have typically been 1.0 m (3.3 ft), wind has typically been 20 knots
  5. May, 71% of days have historically been favorable, water has typically been 12°C (53°F), waves have typically been 0.9 m (2.9 ft), wind has typically been 18 knots
  6. June, 84% of days have historically been favorable, water has typically been 17°C (63°F), waves have typically been 0.7 m (2.2 ft), wind has typically been 16 knots
  7. July, 86% of days have historically been favorable, water has typically been 21°C (70°F), waves have typically been 0.6 m (2.1 ft), wind has typically been 16 knots, historically most favorable
  8. August, 86% of days have historically been favorable, water has typically been 20°C (68°F), waves have typically been 0.7 m (2.2 ft), wind has typically been 15 knots, historically most favorable
  9. September, 80% of days have historically been favorable, water has typically been 18°C (65°F), waves have typically been 0.8 m (2.7 ft), wind has typically been 16 knots
  10. October, 61% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 1.1 m (3.5 ft), wind has typically been 19 knots
  11. November, 32% of days have historically been favorable, water has typically been 11°C (52°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 23 knots
  12. December, 33% of days have historically been favorable, water has typically been 7°C (45°F), waves have typically been 1.4 m (4.5 ft), wind has typically been 23 knots

July and August have typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life seen at this site

Species noted at this site — not a promise of what you’ll encounter.

Species seen here

Rough labels: “Commonly seen” usually means two or more recorded sightings near this site in public dive logs (GBIF), “Occasionally seen” one; “Seasonal” and “Rarely seen” come from dive-guide research. Not a measured rate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated July 2026

Site details

Harborview Beach, beside the Sesuit Harbor breakwater in Dennis, is an easy, shallow Cape Cod Bay shore dive and a favorite quick dusk or night dive for locals. Navigation is simple - keep the breakwater on your right and pick through the rocks for lobsters, crabs, and other critters. Most of the dive is around 10 ft at high tide with a maximum of about 15-20 ft at the end of the breakwater, making it a great beginner site. Dive within an hour of high tide and watch for fishermen on the rocks and boat traffic in the harbor channel.

shore

Fishermen casting from the breakwater (entanglement in monofilament); boat traffic entering and leaving Sesuit Harbor just beyond the breakwater; cold water; very shallow at low tide.

Reviews

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