Puerto de la Cruz, Average Weather March. High Temperature. 22 °C. 72 °F. Low Temperature. 16 °C. 61 °F. Sea Temperature. 19 °C. Puerto de la Cruz, Santa Cruz de Tenerife, Spain Monthly Weather Forecast - weather.com monthlyWeather - Puerto de la Cruz, Santa Cruz de Tenerife, Spain asOfTime Weather in August. The last month of the summer, August, is also a moderately hot month in Puerto de la Cruz, Spain, with an average temperature fluctuating between 27.8°C and 19.8°C. With its high average temperature of 27.8°C and a low of 19.8°C, August is regarded as the warmest month. In August, in Puerto de la Cruz, the rain falls for LkYWN.