TV footage showed older residents who had been evacuated to the town of Ronda breaking into applause as it began to rain.
But firefighters said the rain would not be enough to bring the blaze under control.
“The rain will not put out the fire,” said regional fire chief Juan Sanchez.
“But in places where we have it under control, it will help shorten the time to extinguish it completely.”
‘RAY OF HOPE’
The fire, described by local emergency services as “complex and exceptional”, has so far destroyed around 8,000ha.
Erratic winds, scorching temperatures and low humidity levels had helped to turn the blaze into a “hungry monster”, the region’s deputy fire chief Alejandro Garcia said last week.
Authorities had on Sunday removed around 1,600 people from six villages as a precaution.
Roughly 1,000 people, who had been evacuated from the coastal resort of Estepona when the blaze first began, were on Monday allowed to go back home.
“Controlling it today seems like too much to ask but there is a ray of hope,” regional environment minister Carmen Crespo told news radio Ser.
Two firefighters were injured from falls on Sunday, the regional government said, while a 44-year-old firefighter died on Thursday.
His funeral was held on Sunday.
Southern Spain is the latest area around the Mediterranean basin to be hit by wildfires this summer, a seasonal phenomenon that climate scientists warn will become increasingly common because of man-made global warming.
Large fires have already ravaged parts of Greece, Italy, Turkey, and Algeria.
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