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Averages for Cozumel in November. In November, Cozumel enjoys a blend of rainy and sunny weather conditions with the average rain for the month measuring around 116mm.The average temperature in the island for the month is 25 C and this can be said to be one of the most moderate months as far as weather is concerned.The average high temperature stands at 28Â°C with a slight drop at night to stand at 22Â°C.he average high temperature stands at 28 C with a slight drop at night to stand at 22 C. There is no need of warm clothes during your visit although you could consider carrying a waterproof light jacket in case you are caught up in the rains.
Key weather averages for Cozumel in December. 1  28. 28Â°C max day temperature. 2  6. 6 hours of sunshine per day. 3  9. 9 days with some rainfall. 4  19. 19Â°C min night temperature. 5  11. 11 hours of daylight per day. 6  M. 7  96. 96 mm of monthly rainfall. 8  7. 7 (High) UV index. 9  27. 27Â°C sea temperature.