Torrevieja: Annual Weather Averages. August is the hottest month in Torrevieja with an average temperature of 26°C (79°F) and the coldest is January at 11°C (52°F) with the most daily sunshine hours at 13 in July.The wettest month is October with an average of 59mm of rain.orrevieja: Annual Weather Averages. August is the hottest month in Torrevieja with an average temperature of 26°C (79°F) and the coldest is January at 11°C (52°F) with the most daily sunshine hours at 13 in July.