Spring:
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Summer:
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Fall:
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Winter:
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The region sees in general only two seasons, summer and winter. Winter is the rainy season when the temperature typically ranges between 24°C and 32°C as days of heavy rain mingle with sunny days. Rainy season usually starts by mid/end January, builds up until March, with heaviest rainfalls in April and May lasting until June. During this time the lagoons and ponds between the dunes of the National Park fill up. So do the lower areas of Atins and some of the tracks to the village leading through the Lençóis. By April/May the lagoons of the Lençóis Maranhenses are fully filled. Visitors can expect sunshine throughout and temperatures around 30-35°C. The best time to enjoy the park would thus be from June to the end of September, maybe mid-October, by which time many of the lagoons will have evaporated.