Moderate sargassum is present today. Resort frontages may be cleaned, but independent beaches can have visible wrack. Ask locally which areas are clearest.
For beach conditions, that usually means Costa Mujeres has a better chance than Cancun's most exposed beaches when sargassum is building. It does not mean the coast is immune. Cleanup crews, wind, and overnight accumulation still decide whether a given beach day feels clear or frustrating.
If you are staying in Costa Mujeres, start with your resort's cleaned beachfront early in the morning. North-facing sections and stronger resort cleanup usually look best first thing. If conditions are disappointing, Isla Mujeres and Playa Norte remain the most useful nearby backup.
Cancun's Hotel Zone is the most exposed of the three. Costa Mujeres is usually a step better because it sits farther north and many resorts manage their beaches aggressively. Isla Mujeres, especially Playa Norte, is still the most sheltered option when mainland beaches are rough.
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