Nouns ending in -ment are masculine.
The suffix often marks an action or result derived from a verb.
Is moment masculine or feminine?
lemoment
The rule behind it
99.6% of -ment nouns are masculine
In context
Tu es arrivée au moment où je sortais.
You arrived at the moment I left.
Il ne travaille pas beaucoup en ce moment.
He's not working much at the moment.
Je ne peux rien dire pour le moment.
I can not say anything for the moment.