Swimming is generally open from mid-April to November, give or take and it's one of the best things to do in Marrakech when temperatures are soaring. Though my kids have been known to request swimming on warm days in December or March.
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The best time to visit Morocco is in autumn and spring. However, as the country has a diverse geographical landscape, each season has its beauty. In April, May, and September to November, the weather is pleasantly warm across the high grounds of the Atlas Mountains.
Two weeks in Morocco is enough time for a proper grand tour, from the souks of Fes and Marrakesh to the glittering Sahara, High Atlas mountains, and windy Atlantic coast.
The climate of coastal Morocco is more or less like the same in Portugal except that it's warmer and it has deserts to the south and east. There are no deserts in Portugal. There is also some snow in the High Atlas in Morocco, as well as in the Portuguese Serra da Estrela.