UK.Gov have issued the following travel advice to those intending to visit Monchique
A major forest fire in the area of Monchique, in the Algarve has been burning for 3 days. The fire has now reached the town of Monchique, and Portuguese authorities are evacuating affected areas of the town and surrounding areas. If you are in this area, follow the instructions of the Portuguese police and Civil Protection authorities. Civil Protection Portugal can be reached on 800 246 246 or www.prociv.pt. For your own safety, travel to the Monchique area is not advised under any circumstances until cleared by the Portuguese authorities.
If you need consular assistance, or you have concerns about family or friends in the area, please call (+351) 21 392 4000 or in the UK (+44) 207 008 1500.