Swimming in the beach in October Yes, in Malaga you can, as the sun is still shining brightly in the mornings and during the day. The sea temperature at the beginning of the month is between 19.2ºC and 24.1ºC, in the middle of the month between 16.8ºC and 22.7ºC, at the end of the month between 17.5ºC and 21.1ºC.