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Map of Big Scare / El Gran Susto (Bat Islands)
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Big Scare / El Gran Susto (Bat Islands)

Guanacaste, Costa RicaDirections
Rash guard or 2mm shorty typical

Big Scare / El Gran Susto (Bat Islands) at a glance

Big Scare / El Gran Susto (Bat Islands) is a dive site in Guanacaste, Costa Rica. Typically most favorable Oct · from 3 years of archive data. Recent reports put the water around 31°C (87°F). Check the latest conditions and entry details before you go.

Moderate window now· until 17:00, then favorable until 18:00 · sunset 17:21

Forecast for this hour · 15:00 · run 16 h ago
1.1 m (3.5 ft)waves — about a meter expected (waves — about four feet expected)

Tap a factor for its source and model point · Forecast 31°C · seasonal avg 29°C ( · Forecast 87°F · seasonal avg 84°F)

Dive windows this week

Sun9:00–17:00 moderate, 17:00–18:00 favorable

1.1 m waves · 12 kn wind (3.5 ft waves · 12 kn wind)

Mon6:00–8:00 favorable, 8:00–18:00 moderate

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

Tue6:00–18:00 favorable

0.9 m waves · 5 kn wind (3.0 ft waves · 5 kn wind)

Wed6:00–18:00 favorable

0.9 m waves · 5 kn wind (3.1 ft waves · 5 kn wind)

Thu6:00–9:00 favorable, 9:00–14:00 moderate, 14:00–18:00 favorable

1.0 m waves · 8 kn wind (3.2 ft waves · 8 kn wind)

Fri6:00–13:00 favorable, 13:00–17:00 moderate, 17:00–18:00 favorable

1.0 m waves · 7 kn wind (3.3 ft waves · 7 kn wind)

SatNot 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 5:12 · Sunrise 5:33 · Sunset 17:21 · some windows run past sunset

Source: Open-Meteo marine · model point 1.3 km from site · updated 24 Oct, 23:20 GMT-6

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Big Scare / El Gran Susto (Bat Islands)

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?

Best months, historically

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

  1. January, 14% of days have historically been favorable, water has typically been 27°C (80°F), waves have typically been 1.4 m (4.7 ft), wind has typically been 22 knots
  2. February, 14% of days have historically been favorable, water has typically been 26°C (79°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 23 knots
  3. March, 38% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 19 knots
  4. April, 32% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 20 knots
  5. May, 54% 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 16 knots
  6. June, 43% of days have historically been favorable, water has typically been 30°C (85°F), waves have typically been 1.5 m (5.0 ft), wind has typically been 15 knots
  7. July, 32% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.4 m (4.7 ft), wind has typically been 19 knots
  8. August, 42% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 18 knots
  9. September, 58% of days have historically been favorable, water has typically been 29°C (85°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 15 knots
  10. October, 62% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 14 knots, historically most favorable
  11. November, 51% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 16 knots
  12. December, 32% of days have historically been favorable, water has typically been 27°C (81°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 21 knots

October 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

No recorded sightings data for this site yet. Species lists appear as GBIF records and diver reports accumulate.

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.

boatdriftpinnacle

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

Reviews

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