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Map of Shark Alley (Dyer Island), Gansbaai
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Shark Alley (Dyer Island), Gansbaai

Western Cape, South AfricaDirections
5mm wetsuit typical

Shark Alley (Dyer Island), Gansbaai at a glance

Shark Alley (Dyer Island), Gansbaai is a dive site in Western Cape, South Africa. Typically most favorable Jan · from 3 years of archive data. Divers commonly see Great white shark, Bronze whaler (copper shark), and Common dolphin. Recent reports put the water around 17°C (63°F). Check the latest conditions and entry details before you go.

Next window today· 6:00–20:00 · favorable · sunset 19:05

Forecast for this hour · 1:00 · run 18 h ago
1.3 m (4.2 ft)waves — about a meter and a half expected (waves — about four feet expected)

Tap a factor for its source and model point · Forecast 17°C · seasonal avg 17°C ( · Forecast 63°F · seasonal avg 62°F)

Dive windows this week

Smallest waves: Wed
Mon6:00–20:00 favorable

1.4 m waves · 10 kn wind (4.5 ft waves · 10 kn wind)

Tue6:00–20:00 favorable

1.3 m waves · 6 kn wind (4.3 ft waves · 6 kn wind)

Wed6:00–20:00 favorable

1.2 m waves · 8 kn wind (3.9 ft waves · 8 kn wind)

Thu6:00–8:00 moderate

2.5 m waves · 12 kn wind (8.1 ft waves · 12 kn wind)

Fri6:00–20:00 moderate

2.0 m waves · 12 kn wind (6.4 ft waves · 12 kn wind)

Sat6:00–20:00 moderate

2.1 m waves · 11 kn wind (6.8 ft waves · 11 kn wind)

SunNot in the forecast yet

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 5:20 · Sunrise 5:46 · Sunset 19:05 · some windows run past sunset

Source: Open-Meteo marine · model point 4.7 km from site · updated 25 Oct, 07:26 GMT+2

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Shark Alley (Dyer Island), Gansbaai

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: Bronze whaler (copper shark), Kelp gull, Cape fur seal

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, 17% of days have historically been favorable, water has typically been 19°C (66°F), waves have typically been 2.3 m (7.6 ft), wind has typically been 12 knots, historically most favorable
  2. February, 6% of days have historically been favorable, water has typically been 19°C (66°F), waves have typically been 2.5 m (8.3 ft), wind has typically been 12 knots
  3. March, 14% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 2.4 m (8.0 ft), wind has typically been 11 knots
  4. April, 12% of days have historically been favorable, water has typically been 16°C (61°F), waves have typically been 2.7 m (8.7 ft), wind has typically been 10 knots
  5. May, 2% of days have historically been favorable, water has typically been 16°C (60°F), waves have typically been 3.1 m (10.2 ft), wind has typically been 9 knots
  6. June, 2% of days have historically been favorable, water has typically been 15°C (60°F), waves have typically been 3.6 m (11.7 ft), wind has typically been 10 knots
  7. July, 1% of days have historically been favorable, water has typically been 14°C (58°F), waves have typically been 3.7 m (12.2 ft), wind has typically been 10 knots
  8. August, 2% of days have historically been favorable, water has typically been 14°C (58°F), waves have typically been 3.6 m (11.7 ft), wind has typically been 11 knots
  9. September, 2% of days have historically been favorable, water has typically been 15°C (60°F), waves have typically been 3.3 m (10.7 ft), wind has typically been 12 knots
  10. October, 5% of days have historically been favorable, water has typically been 17°C (62°F), waves have typically been 2.6 m (8.6 ft), wind has typically been 12 knots
  11. November, 9% of days have historically been favorable, water has typically been 18°C (65°F), waves have typically been 2.6 m (8.5 ft), wind has typically been 12 knots
  12. December, 5% of days have historically been favorable, water has typically been 20°C (68°F), waves have typically been 2.5 m (8.2 ft), wind has typically been 12 knots

January 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 recorded at this site, by month

Recorded observations — evidence of past sightings, 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.

  • Carcharodon carcharias recorded here Sep (7 records)

    most recent 2010

Newest record here: 2010. Counts are occurrence records near this site from public biodiversity datasets (GBIF), grouped by calendar month across all sampled years. Sightings vary — past records are context, not a prediction.

The underwater calendar

When these animals are most recorded around Southern Africa — from open sighting data, not a promise.

Watch the whole year animate on the Migrations map

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

No description for this site yet — divers who know it can suggest one below.

boatdrift

No hazards recorded for this site yet — that never means there are none. Ask a local operator before you dive.

Reviews

No reviews yet — this site is waiting for its first. Dived here? Your rating and a few lines help the next diver.

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