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IntermediateBoth

Gun Beach

Guam, United StatesDirections
Open Water suggested2–31 m (5–100 ft) depthBoth entryRash guard or 2mm shorty typical

Gun Beach at a glance

Gun Beach is an intermediate both dive site in Guam, United States with depths of 1.5–30.5 m (5–100 ft). Typically most favorable Aug · from 3 years of archive data. Divers commonly see Green sea turtle, Octopus, and Hard coral. Recent reports put the water around 28°C (83°F). Check the latest conditions and entry details before you go.

Next window today· 7:00–18:00 · favorable & moderate · sunset 17:55

Forecast for this hour · 6:00 · run 3 h ago
1.1 m (3.7 ft)waves — about a meter expected (waves — about four feet expected)

Tap a factor for its source and model point · Forecast 28°C · seasonal avg 30°C ( · Forecast 83°F · seasonal avg 86°F)

Site hazards: Outgoing rip/current through the channel, shallow sharp reef, coral contact, boat traffic, possible surf/surge, lionfish/fire coral, and navigation issues on the return.

Read the full hazards ↓

Dive windows this week

Smallest waves: Wed
Tue7:00–8:00 moderate, 8:00–11:00 favorable, 11:00–12:00 moderate, 12:00–15:00 favorable, 15:00–18:00 moderate

1.1 m waves · 5 kn wind (3.6 ft waves · 5 kn wind)

Wed7:00–18:00 favorable

1.0 m waves · 3 kn wind (3.2 ft waves · 3 kn wind)

Thu7:00–18:00 moderate

1.1 m waves · 9 kn wind (3.5 ft waves · 9 kn wind)

Fri7:00–9:00 favorable, 9:00–18:00 moderate

1.7 m waves · 10 kn wind (5.5 ft waves · 10 kn wind)

Sat7:00–18:00 moderate

2.0 m waves · 7 kn wind (6.6 ft waves · 7 kn wind)

Sun7:00–18:00 moderate

1.7 m waves · 2 kn wind (5.4 ft waves · 2 kn wind)

Mon7:00–18:00 moderate

1.6 m waves · 8 kn wind (5.1 ft waves · 8 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 5:51 · Sunrise 6:13 · Sunset 17:55 · some windows run past sunset

Source: Open-Meteo marine · model point 2.7 km from site · updated 27 Oct, 03:26 GMT+10

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Gun 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: Hard coral, tropical reef fish
Best time: Plan for calm surf and favorable tide/current, commonly incoming or slack for easier exit. Avoid strong outgoing tide until familiar with the site.

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, 15% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 2.1 m (6.8 ft), wind has typically been 14 knots
  2. February, 5% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 2.2 m (7.2 ft), wind has typically been 15 knots
  3. March, 32% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.9 m (6.2 ft), wind has typically been 13 knots
  4. April, 41% of days have historically been favorable, water has typically been 29°C (83°F), waves have typically been 1.7 m (5.5 ft), wind has typically been 12 knots
  5. May, 72% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 12 knots
  6. June, 80% of days have historically been favorable, water has typically been 29°C (85°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 11 knots
  7. July, 83% of days have historically been favorable, water has typically been 30°C (85°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 11 knots
  8. August, 91% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.2 m (3.9 ft), wind has typically been 9 knots, historically most favorable
  9. September, 88% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.3 m (4.1 ft), wind has typically been 10 knots
  10. October, 75% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 11 knots
  11. November, 38% of days have historically been favorable, water has typically been 29°C (85°F), waves have typically been 1.9 m (6.1 ft), wind has typically been 15 knots
  12. December, 9% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 2.1 m (6.8 ft), wind has typically been 15 knots

August 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.

The underwater calendar

When these animals are most recorded around Micronesia & western Pacific — from open sighting data, not a promise.

Watch the whole year animate on the Migrations map

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 July 2026

Site details

North Tumon Bay shore reef with a known cable/pipe channel through the shallow reef flat. It can be snorkeled or dived from shore, and boats may also use the area. The best diving is on the healthy coral side once past the reef flat; the return through the channel/current is the key skill.

boatreefshore

Outgoing rip/current through the channel, shallow sharp reef, coral contact, boat traffic, possible surf/surge, lionfish/fire coral, and navigation issues on the return.

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