"Semitic" is not a race, it's a linguistic group. A blonde haired, blue eyed Syrian is a Semite just like a tan Egyptian or a jet black Sudanese woman (provided they all speak Arabic or a more obscure Semitic language). Ancient Egyptian wasn't a Semitic language but it was in the same family (Afroasiatic) and it certainly influenced modern Semitic languages, at least in the Nile region.
Race generally is a problematic concept to use when talking about pre-modern history because many people have had no concept of race, or a much different one than ours. Luckily, with the Egyptians we have a lot of art made by Egyptians which seems to depict them very realistically
As you can see, ancient Egyptians broadly resembled modern Egyptians and most other Arabs. While you can find depictions of white and black people, most people depicted are neither strictly speaking black or white, but tan.
Later Pharaohs are definitely white because of the Ptolemaic dynasty from Macedonian extract.
However, genetic testing on native Egyptian pharaohs has shown diverse results: For example, Ramesses III is part of Haplotype E1b1a which today is most common amongst the ethnic groups of Ethiopia and East Africa, yet Tutankhamun (aka Tut) is [R1b](http://en.wikipedia.org/wiki/Haplogroup_R1b_(Y-DNA) which is a very European group.
EDIT: Also, they were not Semitic who were a distantly related group within the same family.
hi! this question is oddly common here. You may find additional info in these posts:
Were black people the ruling class in ancient Egypt?
What skin color did Ancient Egyptians have?
Did Ancient Egyptians have black skin?
What was the racial composition of Ancient Egypt?
What was the primary ethnic or racial group in Ancient Egypt?
