Castor Bank is a shore dive site in Nosy Be, Madagascar. Typically most favorable Feb–Nov · from 3 years of archive data. Divers commonly see Whale shark, Reef manta ray, and Spotted eagle ray. Recent reports put the water around 27°C (81°F). Check the latest conditions and entry details before you go.
Tap a factor for its source and model point · Forecast 27°C · seasonal avg 27°C
Dive windows this week
Best: ThuFavorable windowModerate window— no window
First light 5:47 · Sunrise 6:10 · Sunset 17:38
Source: Open-Meteo marine · model point 19 km from site · graded 7h ago
Forecast only — always assess conditions on site.
Dated firsthand observations from divers — not current conditions.
No diver reports for this site yet. — one dated observation helps every diver after you.
Based on community reviews and site data. Conditions vary — always verify before diving.
What conditions have historically been typical at this site, month by month — not a forecast.
February, March, April, May, June, July, August, September, October, and November havetypically 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.
Species noted at this site — not a promise of what you’ll encounter.
No dive shops mapped within 25 km. Know one? Add it to the map.
No description for this site yet — divers who know it can suggest one below.
No hazards recorded for this site yet — that never means there are none. Ask a local operator before you dive.
Divers at Castor Bank in Madagascar commonly report sightings of Whale shark, Reef manta ray, Spotted eagle ray, Reef shark, and Green turtle. Marine life varies by season and conditions—check the site page for recent diver observations and photos.
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