According to a report by Postal here is where you can find the fixed speed cameras in the Algarve:

A2 – Parish of Paderne (Albufeira), at km 233.114;

EN125 – Parish of Lagoa (Lagoa), at km 49.575;

EN125 – Parish of Guia (Albufeira), at km 68,650;

EN125 – Parish of S. Pedro (Faro), at km 102;

EN125-10 – Parish of Montenegro (Faro), at km 1,430.

What are the fines for speeding?

Driving at excessive speeds can result in a fine, disqualification from driving and loss of points on your driving license. The value of the fine varies depending on the speed. If you drive a light car, fines for speeding start at 60 euros and can go up to 2,500 euros.

Regarding the loss of points on your driving license, if you commit a serious offense, 2 points will be removed from your driving license, whereas in the case of very serious offenses, 4 points will be deducted.