When To Go · Destination Guide
Expedition diving and Arabian Sea megafauna off Dhofar's wild island frontier
Updated Feb 13, 2026 • 20 sources
When to go
Hallaniyat is highly seasonal for sea access.
Best overall window
More reliable crossings and calmer seas; water often around 24°C to 28°C.
Outside that window
Khareef monsoon brings rough seas and reduced visibility; offshore trips are frequently limited.
Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.
The overall row stays visible so you can compare it against the currently selected scope.
| Scope | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | Overall - Jan: Best | Overall - Feb: Best | Overall - Mar: Best | Overall - Apr: Best | Overall - May: Good | Overall - Jun: Tradeoffs | Overall - Jul: Tradeoffs | Overall - Aug: Tradeoffs | Overall - Sep: Good | Overall - Oct: Best | Overall - Nov: Best | Overall - Dec: Best |
These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.
Arabian Sea humpback whales (resident population)
Best for Scuba, Freedive, Snorkel, Topside
Year-round
This endangered humpback whale subpopulation is unusual for being nonmigratory, with longterm research showing high site fidelity in Omani waters.
Reef manta ray aggregation window
Best for Scuba, Freedive, Snorkel
Oct to Jan
Reef manta rays have documented seasonal aggregations around the Hallaniyat Islands area.
Khareef season landscapes in Dhofar
Best for Topside
Jun to Sep
Dhofar's Khareef season brings mist and light rain that turn the mountains green and can create seasonal waterfalls at wadis such as Wadi Darbat.
Seabird breeding and sensitive nesting areas
Best for Topside, Snorkel
Apr to Sep
The island group is recognized for important bird habitat.
Sea turtle nesting (variable, follow local guidance)
Best for Topside, Snorkel
May to Aug
The islands include turtle nesting beaches.
Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.