Big Blue
Welcome to our stunning dive site located near Hilton Road in Tamuning, Guam, United States. This incredible underwater paradise offers divers a captivating experience with its abundant marine life and exceptional visibility of 14 meters.
Our dive site boasts a beautiful curved sloping reef that stretches from close to the surface to a maximum depth of 21 meters, making it suitable for both beginner and advanced divers. The vibrant hard corals and diverse range of reef fish make this a true haven for underwater enthusiasts.
For those seeking a thrilling encounter, keep an eye out for the impressive schools of barracuda, graceful rays, and magnificent turtles that frequent this site. Additionally, lucky divers might spot the elusive Hawksbill and Green Sea Turtles, alongside the striking Large Map Pufferfish. The shallows also provide opportunities for observing Black-Tip Sharks.
Whether you are a novice or an expert diver, this site promises an unforgettable adventure. Please note that access to this remarkable dive site is limited to boat dives only. So, gear up, dive in, and explore the wonders that await beneath the surface at our extraordinary dive site in Guam, United States.
Our dive site boasts a beautiful curved sloping reef that stretches from close to the surface to a maximum depth of 21 meters, making it suitable for both beginner and advanced divers. The vibrant hard corals and diverse range of reef fish make this a true haven for underwater enthusiasts.
For those seeking a thrilling encounter, keep an eye out for the impressive schools of barracuda, graceful rays, and magnificent turtles that frequent this site. Additionally, lucky divers might spot the elusive Hawksbill and Green Sea Turtles, alongside the striking Large Map Pufferfish. The shallows also provide opportunities for observing Black-Tip Sharks.
Whether you are a novice or an expert diver, this site promises an unforgettable adventure. Please note that access to this remarkable dive site is limited to boat dives only. So, gear up, dive in, and explore the wonders that await beneath the surface at our extraordinary dive site in Guam, United States.
Diving Conditions Score for Big Blue
7.1
GoodGood diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Big Blue
Depth
21m
Visibility
14m
Experience Level
advanced
Weather Conditions for Big Blue
Wave Height
0.84m
Wind Speed
8.9 m/s
Water Temp
29.6°C
Visibility
9.14km
Cloud Cover
100%
Wave Period
7s
Air Temperature
26.8°C
Precipitation
0.1 mm
Detailed 7-Day Diving Forecast for Big Blue
Alpha
Dive Score Chart for Big Blue
Best time to dive: 12:00 with score 7.6242857142857146/10. Water conditions: Waves 0.86m, Wind 10.1 m/s.Best night dive time: 18:00 with score 7.330438967136151/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Big Blue: 06:00
Sunset at Big Blue: 18:00
Optimal diving conditions at Big Blue 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
12:00Score: 7.6/10
Waves: 0.86m (7s), Wind: 10.1 m/s
Best Night
18:00Score: 7.3/10
Waves: 0.78m, Wind: 11.3 m/s
Seasonal Analysis for Big BlueAlpha
Historical patterns and best seasons for diving at Big Blue
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 Big Blue
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 Big Blue
January
Score: 9.4
February
Score: 9.4
November
Score: 9.4
Ideal Conditions for Big Blue
Water Temp
27.2°C / 81.0°F
May
Visibility
11.7m / 38.4ft
November
Wave Height
1.4m / 4.6ft
September
Wave Period
8.0s
January
Seasonal Insights for Big Blue
Big Blue shows typical northern hemisphere patterns with June being the warmest month (27.3°C) and January the coldest (22.3°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 1.2mm 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 20, 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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