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Bat Island: Big Scare, Gran Susto

The renowned dive site known as The Big Scare is located approximately 50km (31 miles) from Playa Potrero in the esteemed National Park of Santa Rosa, Costa Rica. This captivating site is a haven for experienced divers seeking an exhilarating underwater adventure. Notably, it presents an opportunity for divers to obtain their deep diver or advanced certification during a single day of diving. A duration of 90 to 100 minutes is required to reach the dive site, ensuring ample time to explore its wonders.

The allure of The Big Scare lies primarily in its remarkable inhabitants, the formidable Bull Sharks. These powerful creatures dominate the waters, making for an awe-inspiring encounter. Additionally, lucky divers may have the privilege of encountering other magnificent marine species. From May to November, the peak season, the dive site offers sightings of impressive creatures such as large schools of snappers and Jacks, graceful spotted eagle rays and devil rays, mesmerizing zebra and green eels, and occasional sightings of majestic manta rays, whale sharks, or even orcas.

Undoubtedly, The Big Scare's star attraction is the presence of imposing 12-foot bull sharks serenely patrolling the sandy ocean floor. However, it is paramount that divers possess significant experience and expertise. The currents can be turbulent, necessitating a high level of competence. Competent divers should be capable of swiftly descending and confidently swimming alongside these apex predators. Rest assured, no attacks on divers have ever been reported during the open season. Nevertheless, a safety stop without a line is also a requisite skill.

For those intrigued by the opportunity to dive at The Big Scare, it is vital to note the necessary prerequisites. Advanced and expert divers are recommended due to the profound depths reaching a maximum of 24 meters (79 feet). Moreover, the visibility at this remarkable site averages around 11 meters (36 feet). Fortunately, The Big Scare's close proximity to Provincia Guanacaste, Costa Rica allows for convenient access, making it a must-visit destination for avid divers seeking an unforgettable underwater experience.

Diving Conditions Score for Bat Island: Big Scare, Gran Susto

7.5
Good

Good diving conditions!
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Bat Island: Big Scare, Gran Susto

Depth

24m

Visibility

11m

Experience Level

advanced
expert

Weather Conditions for Bat Island: Big Scare, Gran Susto

Wave Height

1.16m

Wind Speed

13 m/s

Water Temp

29.7°C

Visibility

39.04km

Cloud Cover

86%

Wave Period

12.65s

Air Temperature

25.5°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Bat Island: Big Scare, Gran Susto
Alpha

Dive Score Chart for Bat Island: Big Scare, Gran Susto

Best time to dive: 14:00 with score 7.666186046511628/10. Water conditions: Waves 1.14m, Wind 18.9 m/s.Best night dive time: 0:00 with score 7.096456960408684/10.

Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.

Sunrise at Bat Island: Big Scare, Gran Susto: 06:00
Sunset at Bat Island: Big Scare, Gran Susto: 18:00

Optimal diving conditions at Bat Island: Big Scare, Gran Susto are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.

🌞
Best Overall
14:00

Score: 7.7/10
Waves: 1.14m (12.9s), Wind: 18.9 m/s

🌙
Best Night
0:00

Score: 7.1/10
Waves: 1.18m, Wind: 7.7 m/s

Seasonal Analysis for Bat Island: Big Scare, Gran Susto
Alpha

Historical patterns and best seasons for diving at Bat Island: Big Scare, Gran Susto

The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.

Monthly Dive Score Analysis - Seasonal Diving Conditions

Higher values indicate better diving conditions

Seasonal DiveScore Chart

This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.

Higher values indicate better diving conditions

Best Season for Bat Island: Big Scare, Gran Susto

Winter

Avg. Score: 9.4/10

Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.

Best Months for Bat Island: Big Scare, Gran Susto

January
Score: 9.5
February
Score: 9.4
March
Score: 9.4

Ideal Conditions for Bat Island: Big Scare, Gran Susto

Water Temp

Thermometer Emoji

26.9°C / 80.4°F

May

Visibility

Telescope Emoji

11.1m / 36.4ft

December

Wave Height

Wave Emoji

1.7m / 5.6ft

September

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Bat Island: Big Scare, Gran Susto

Bat Island: Big Scare, Gran Susto shows typical northern hemisphere patterns with April being the warmest month (27.6°C) and November the coldest (22.1°C). The calmest conditions typically occur in September with average wave heights of 1.7m and wave periods of 8.0s. The most comfortable wave conditions are in September with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during September to November, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.

Scoring Legend:
9-10 (Excellent)
7-8 (Good)
5-6 (Average)
3-4 (Poor)
1-2 (Dangerous)

Last updated: 1 min. ago - Jun 21, 2026

Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.

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