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AdvancedShore entry

Fort Constitution / UNH Pier

New Hampshire, United StatesDirections
AOW suggestedShore entry7mm or semi-dry + hood typical

Fort Constitution / UNH Pier at a glance

Fort Constitution / UNH Pier is an advanced shore dive site in New Hampshire, United States. Typically most favorable Jul · from 3 years of archive data. Divers commonly see Cunner, Frilled anemone, and Longhorn sculpin. Recent reports put the water around 15°C (59°F). Check the latest conditions and entry details before you go.

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

Forecast for this hour · 12:00 · run 11 h ago
0.5 m (1.8 ft)waves — under a meter expected (waves — about two feet expected)

Tap a factor for its source and model point · Forecast 15°C · seasonal avg 14°C ( · Forecast 59°F · seasonal avg 58°F)

Site hazards: Very strong tidal current outside slack, heavy silt, research structures and boat operations, Coast Guard station nearby

Read the full hazards ↓

Dive windows this week

Sun8:00–18:00 favorable

0.5 m waves · 3 kn wind (1.8 ft waves · 3 kn wind)

Mon8:00–18:00 favorable

0.4 m waves · 7 kn wind (1.4 ft waves · 7 kn wind)

Tue8:00–18:00 favorable

0.6 m waves · 5 kn wind (2.0 ft waves · 5 kn wind)

Wed8:00–18:00 favorable

0.5 m waves · 4 kn wind (1.6 ft waves · 4 kn wind)

Thu8:00–18:00 moderate

0.5 m waves · 9 kn wind (1.6 ft waves · 9 kn wind)

Fri8:00–18:00 favorable

0.2 m waves · 7 kn wind (0.8 ft waves · 7 kn wind)

Sat8:00–18:00 favorable

0.3 m waves · 6 kn wind (0.8 ft waves · 6 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 6:39 · Sunrise 7:08 · Sunset 17:44 · some windows run past sunset

Source: Open-Meteo marine · model point 13 km from site · updated 25 Oct, 01:23 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Fort Constitution / UNH Pier

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: Cunner, Frilled anemone, Sea star
Best time: High slack tide after an incoming tide

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, 45% of days have historically been favorable, water has typically been 6°C (42°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 22 knots
  2. February, 32% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 22 knots
  3. March, 31% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 21 knots
  4. April, 59% of days have historically been favorable, water has typically been 6°C (43°F), waves have typically been 1.2 m (3.9 ft), wind has typically been 19 knots
  5. May, 68% of days have historically been favorable, water has typically been 11°C (51°F), waves have typically been 1.1 m (3.5 ft), wind has typically been 17 knots
  6. June, 86% of days have historically been favorable, water has typically been 15°C (59°F), waves have typically been 0.8 m (2.6 ft), wind has typically been 16 knots
  7. July, 87% of days have historically been favorable, water has typically been 17°C (63°F), waves have typically been 0.8 m (2.6 ft), wind has typically been 16 knots, historically most favorable
  8. August, 85% of days have historically been favorable, water has typically been 18°C (65°F), waves have typically been 0.9 m (2.8 ft), wind has typically been 15 knots
  9. September, 76% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 1.1 m (3.6 ft), wind has typically been 15 knots
  10. October, 57% of days have historically been favorable, water has typically been 14°C (58°F), waves have typically been 1.2 m (4.1 ft), wind has typically been 18 knots
  11. November, 51% of days have historically been favorable, water has typically been 11°C (52°F), waves have typically been 1.1 m (3.6 ft), wind has typically been 21 knots
  12. December, 38% of days have historically been favorable, water has typically been 8°C (46°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 22 knots

July has 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

Facts from OpenStreetMap, corrected by the community — listed by distance only. Details change; confirm with the shop.

Shop facts come from OpenStreetMap and community corrections, shown nearest first. PickADive lists facts and contacts only — no listing is sponsored or ranked.

Data updated June 2026

Site details

A muck-and-critter dive beneath and beside the UNH 325-foot marine research pier at Fort Point, New Castle, next to the historic Fort Constitution. Strong Piscataqua River currents make this strictly a slack-tide dive; the silty bottom hides invertebrate life and old artifacts such as antique ceramic pipes. Best done at high slack after an incoming tide with someone who knows the site.

muckshore

Very strong tidal current outside slack, heavy silt, research structures and boat operations, Coast Guard station nearby

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