You Do Need power plug adapter while traveling from Somaliland to Portugal.

Here is Why You Need An Adapter

The outlet and plug type used in Portugal are C and F and in Somaliland is G. This is how they look like.

Somaliland

In Somaliland, outlets of type G are in use.

Type G

Portugal

In Portugal, outlets of type C and F are in use.

Type C

Type F