Coccothrinax readii, is a palm endemic to the Yucatan coast, its successful establishment in stressful environments suggests that factors such as mycorrhizal association may determine its success, the question arose in this work, assess environmental conditions which states and to describe their particular characteristics related to the anatomy of their roots and mycorrhizal colonization in three different seasons over a year. The study site was the coastal dune scrub of San Benito, Yucatan, where he placed a data logger that measurements performed ambient temperature (T), relative humidity (HR) and photosynthethic photon flux (PPF) for five days in dry, rainy and windy, also determined the total phosphorus and extractable of the soil. The results indicate significant fluctuations of environmental variables throughout the year, on the other hand, the presence of the velamen on the roots of C. readii not restrict arbuscular mycorrhizal colonization. This association is affected by microenvironmental conditions, as during the dry season, when environmental conditions are unfavorable, the colonization percentage is higher than in the windy season, when microenvironmental conditions are more favorable.