September is the hottest month in Alviso with an average temperature of 20°C (67°F) and the coldest is January at 10°C (49°F) with the most daily sunshine hours at 14 in July. The wettest month is January with an average of 89.6mm of rain. The best month to swim in the sea is in August when the average sea temperature is 16°C (60°F).
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Sunrise 07:19
Sunset 16:54