The furthest south of the Mediterranean Costas, Costa Del Sol and Torremolinos offers around 300 to 320 guaranteed days of bright sunshine annually with a mean temperature of 18 degrees centigrade, and peak temperatures in high season (June to September) up in the late 20s centigrade.
The Costa Del Sol coast benefits from the Med's cooling sea breezes, so temperatures in peak season are less oppressive than Andalucian inland locations. Torremolinos benefits from the shelter of the Sierra de Mijas mountains.
Outside of the peak summer months of June, July, August and September (when rain is unheard of and temperatures sit around 28/29 degrees centigrade and sometimes higher) you've superb cooler spring-time and autumn-time temperatures in both May and October. These are great months for visitors looking to explore the Costa Del Sol further afield either by car rental or excursions. For full on traditional and guaranteed sunshine beach holidays in Torremolinos choose one of the peak summer months.
Temperatures and rainfall by month annually in Torremolinos tend to fall along these lines - January maximum temperature 16 degrees centigrade/minimum 8C with around 7 days of rainfall. February average maximum 17C/minimum 8C/rainfall 6 days, March starts to push up a little to average maximum 19C/minimum 10C/rainfall 5 days, April average maximum 21C/minimum 12C, rainfall 5 days, and for May average maximum 23C/minimum 14C/rainfall 3.
June average maximum 27C/minimum 17C/rainfall 1 day, July average maximum 29C/minimum 20C/rainfall less than 1 day if any, August average maximum 29C/minimum 21C/rainfall less than 1, September average maximum 28C/minimum 19C/rainfall 2 days.
October average maximum 23C/minimum 15C/rainfall 4 days, November average maximum 19C/minimum 11C/rainfall 6 days and December average maximum 17C/minimum 8C/rainfall 6 days.