Ron’s Reef
Discover the breathtaking dive site at The Scotia, also known as First Beach, located in the captivating waters of Glass Breakwater, Port of Guam, Piti Municipality, United States. This coveted spot is exclusively accessible by boat, ensuring a serene and undisturbed diving experience. Divers must remain vigilant of passing vessels overhead for safety.
Prepare to be mesmerized by the crystal-clear waters boasting superb visibility of up to 14 meters. With a maximum depth of 19 meters, this dive site caters to all levels of expertise, welcoming beginners, advanced, and expert divers alike.
The Scotia offers a diverse marine ecosystem teeming with a wide variety of fish species. This underwater paradise is particularly cherished by macro photographers who delight in capturing the beauty of the impressive blue coral stand nestled around 35 feet deep. Keep your eyes wide open as pelagic species frequently grace this area during their migratory journeys.
Immerse yourself in the wonders of The Scotia, an enchanting dive site where underwater exploration effortlessly merges with natural beauty. Embark on your unforgettable aquatic adventure at this renowned location in Guam, United States.
Prepare to be mesmerized by the crystal-clear waters boasting superb visibility of up to 14 meters. With a maximum depth of 19 meters, this dive site caters to all levels of expertise, welcoming beginners, advanced, and expert divers alike.
The Scotia offers a diverse marine ecosystem teeming with a wide variety of fish species. This underwater paradise is particularly cherished by macro photographers who delight in capturing the beauty of the impressive blue coral stand nestled around 35 feet deep. Keep your eyes wide open as pelagic species frequently grace this area during their migratory journeys.
Immerse yourself in the wonders of The Scotia, an enchanting dive site where underwater exploration effortlessly merges with natural beauty. Embark on your unforgettable aquatic adventure at this renowned location in Guam, United States.
Diving Conditions Score for Ron’s Reef
7.2
GoodGood diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Ron’s Reef
Depth
19m
Visibility
14m
Experience Level
beginner
advanced
expert
Weather Conditions for Ron’s Reef
Wave Height
0.76m
Wind Speed
9.3 m/s
Water Temp
30.1°C
Visibility
50km
Cloud Cover
94%
Wave Period
6.65s
Air Temperature
28.4°C
Precipitation
0.3 mm
Detailed 7-Day Diving Forecast for Ron’s Reef
Alpha
Dive Score Chart for Ron’s Reef
Best time to dive: 13:00 with score 8.499556565656565/10. Water conditions: Waves 0.76m, Wind 3.8 m/s.Best night dive time: 18:00 with score 8.144694987468672/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Ron’s Reef: 06:00
Sunset at Ron’s Reef: 18:00
Optimal diving conditions at Ron’s 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
13:00Score: 8.5/10
Waves: 0.76m (6.6s), Wind: 3.8 m/s
Safest Overall
17:00Score: 8.5/10
Waves: 0.78m (6.65s), Wind: 2.7 m/s
Best Night
18:00Score: 8.1/10
Waves: 0.8m, Wind: 0.6 m/s
Seasonal Analysis for Ron’s ReefAlpha
Historical patterns and best seasons for diving at Ron’s 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 Ron’s 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 Ron’s Reef
January
Score: 9.5
February
Score: 9.4
November
Score: 9.4
Ideal Conditions for Ron’s 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 Ron’s Reef
Ron’s 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 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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