Surprise Reef
Discover the untouched beauty of pristine coral at this sea mount, situated to the west of San Luis Beach. Unlike other seamounts that were dredged in the ’60s, this site remains unscathed. Immerse yourself in stunning anemone beds and encounter a diverse range of reef fish. Accessible exclusively by boat, this hidden gem promises an unforgettable diving experience.
With optimal visibility of up to 12 meters and a maximum depth of 21 meters, this site caters to both beginner and advanced divers. Located in the United States, specifically on Marine Corps Drive, Sånta Rita-Sumai Municipality, Guam, 96915, the site offers convenient access for diving enthusiasts.
Indulge in the beauty of an untouched reef adorned with several large anemone beds teeming with dusky anemone fish. Keep an eye out for juvenile Napoleon Wrasses, a frequent sight in this rarely explored area. Ensuring a pristine underwater encounter, the coral at this site remains undisturbed, offering a truly captivating experience.
Seize the opportunity to explore this remarkable dive site, known for its preserved coral and captivating marine life. Marvel at the vibrant anemone beds and the abundance of reef fish that call this site home. Dive into an underwater oasis that can only be reached by boat, making it an exclusive haven for divers seeking unparalleled beauty.
With optimal visibility of up to 12 meters and a maximum depth of 21 meters, this site caters to both beginner and advanced divers. Located in the United States, specifically on Marine Corps Drive, Sånta Rita-Sumai Municipality, Guam, 96915, the site offers convenient access for diving enthusiasts.
Indulge in the beauty of an untouched reef adorned with several large anemone beds teeming with dusky anemone fish. Keep an eye out for juvenile Napoleon Wrasses, a frequent sight in this rarely explored area. Ensuring a pristine underwater encounter, the coral at this site remains undisturbed, offering a truly captivating experience.
Seize the opportunity to explore this remarkable dive site, known for its preserved coral and captivating marine life. Marvel at the vibrant anemone beds and the abundance of reef fish that call this site home. Dive into an underwater oasis that can only be reached by boat, making it an exclusive haven for divers seeking unparalleled beauty.
Diving Conditions Score for Surprise Reef
6.5
Above AverageDecent conditions, proceed with caution.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Surprise Reef
Depth
21m
Visibility
12m
Experience Level
beginner
advanced
Weather Conditions for Surprise Reef
Wave Height
0.94m
Wind Speed
18.7 m/s
Water Temp
29.9°C
Visibility
2.84km
Cloud Cover
100%
Wave Period
6.65s
Air Temperature
25.3°C
Precipitation
0.6 mm
Detailed 7-Day Diving Forecast for Surprise Reef
Alpha
Dive Score Chart for Surprise Reef
Best time to dive: 8:00 with score 7.056382152230972/10. Water conditions: Waves 0.88m, Wind 17 m/s.Best night dive time: 3:00 with score 6.617077858880778/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Surprise Reef: 06:00
Sunset at Surprise Reef: 18:00
Optimal diving conditions at Surprise Reef 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
8:00Score: 7.1/10
Waves: 0.88m (6.35s), Wind: 17 m/s
Best Night
3:00Score: 6.6/10
Waves: 0.8m, Wind: 12.6 m/s
Seasonal Analysis for Surprise ReefAlpha
Historical patterns and best seasons for diving at Surprise Reef
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 Surprise Reef
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 Surprise Reef
January
Score: 9.5
February
Score: 9.4
November
Score: 9.4
Ideal Conditions for Surprise Reef
Water Temp
27.6°C / 81.7°F
May
Visibility
11.2m / 36.7ft
November
Wave Height
1.4m / 4.6ft
September
Wave Period
8.0s
January
Seasonal Insights for Surprise Reef
Surprise Reef shows typical northern hemisphere patterns with May being the warmest month (27.6°C) and January the coldest (22.7°C). The calmest conditions typically occur in September with average wave heights of 1.4m 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). February is usually the driest month with 1.0mm 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.
Last updated: 1 min. ago - Jun 18, 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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