Bile Bay
Welcome to one of the most beloved dive sites in the southern region of Merizo, Guam. With a depth range of 10-60 feet and featuring spacious caverns, this site offers an exceptional diving experience. Notably, a resident pod of spinner dolphins can be spotted here almost every time. Suitable for divers of all skill levels, including beginners, this site is also perfect for snorkeling and kayaking. Please remember to obtain the landowner's permission if planning to dive from the shore. For the best experience, we recommend drifting from a boat.
This site's popularity is further enhanced by the regular presence of pods of spinner dolphins, often visible during morning dives. The rich marine life includes a diverse array of reef fish, making it an ideal habitat for underwater exploration.
For optimal visibility, enjoy a crystal-clear underwater view of up to 20 meters. The maximum depth of this site is 21 meters, providing a safe and immersive diving experience. Located in the United States, specifically in West Chalan Canton Tasi, Merizo, Merizo Municipality, Guam, 969166916, this dive site offers convenient access for divers seeking an unforgettable adventure.
Explore this southern gem and uncover the wonders hidden beneath the waves. Whether you are a seasoned diver or a beginner, this dive site promises an exceptional and memorable underwater journey.
This site's popularity is further enhanced by the regular presence of pods of spinner dolphins, often visible during morning dives. The rich marine life includes a diverse array of reef fish, making it an ideal habitat for underwater exploration.
For optimal visibility, enjoy a crystal-clear underwater view of up to 20 meters. The maximum depth of this site is 21 meters, providing a safe and immersive diving experience. Located in the United States, specifically in West Chalan Canton Tasi, Merizo, Merizo Municipality, Guam, 969166916, this dive site offers convenient access for divers seeking an unforgettable adventure.
Explore this southern gem and uncover the wonders hidden beneath the waves. Whether you are a seasoned diver or a beginner, this dive site promises an exceptional and memorable underwater journey.
Diving Conditions Score for Bile Bay
5.8
AverageAverage conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Bile Bay
Depth
21m
Visibility
20m
Experience Level
beginner
Weather Conditions for Bile Bay
Wave Height
1.12m
Wind Speed
23.1 m/s
Water Temp
29.6°C
Visibility
6.94km
Cloud Cover
79%
Wave Period
6.45s
Air Temperature
30.5°C
Precipitation
0.4 mm
Detailed 7-Day Diving Forecast for Bile Bay
Alpha
Dive Score Chart for Bile Bay
Best time to dive: 17:00 with score 6.803952038369304/10. Water conditions: Waves 0.98m, Wind 8.8 m/s.Best night dive time: 19:00 with score 6.61851111111111/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Bile Bay: 06:00
Sunset at Bile Bay: 18:00
Optimal diving conditions at Bile Bay 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
17:00Score: 6.8/10
Waves: 0.98m (6.95s), Wind: 8.8 m/s
Best Night
19:00Score: 6.6/10
Waves: 0.94m, Wind: 6.8 m/s
Seasonal Analysis for Bile BayAlpha
Historical patterns and best seasons for diving at Bile Bay
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 Bile Bay
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 Bile Bay
January
Score: 9.4
February
Score: 9.4
November
Score: 9.3
Ideal Conditions for Bile Bay
Water Temp
26.6°C / 79.9°F
July
Visibility
11.2m / 36.7ft
November
Wave Height
1.6m / 5.2ft
September
Wave Period
8.0s
January
Seasonal Insights for Bile Bay
Bile Bay shows typical northern hemisphere patterns with June 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 1.6m 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 0.7mm 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.
50 Dive sites near Bile Bay in
Spanish Steps
The Wall
Ron’s Reef
Black Coral Kingdom
RMS Scotia, wreck
Pete’s West
Vecki Reef
Pete’s Reef
Seabee Junkyard
Anae Caverns
Cocos West
Nathan’s Dent
Barracuda Rock
Hidden Reef
Coral Gardens
Fish Bowl
American Tanker, wreck
Blue & White
Finger Reef
Sharks Pit
Boulder Alley
Val Bomber (Wreck)
Cocos East
Tarzan Cave
Fouha Bay
Harley Reef
Gab Gab 1
Gab Gab 2
Amtrak
Bile Bay
Hap’s Reef
Scuba Beach
Kitsugawa Maru (Wreck)
Surprise Reef
Western Shoals
Luminao Reef
Outhouse Beach
Tokai Maru, wreck
SMS Cormoran, wreck
Lunar Scape
Piti Bomb Holes
Camel Rock
Asan Cut
Agana Bay
Palace Wall
Alupat Island
Hilton Wall
Big Blue
Gun Beach
Northern Caves
Got feedback?
Help us improve this dive site by giving us feedback.