French · Pronunciation Guide
set, exactly like the English word "set". The "p" is completely silent.
One syllable, closed by that audible "t". Unlike most French words, "sept" keeps its final consonant in every position, so it sounds the same before consonants, vowels, and pauses alike.
Listen: sept
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Il y a sept jours dans une semaine.
There are seven days in a week.
Listen: Il y a sept jours dans une semaine.
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"Il y a sept jours dans une semaine" opens with "il y a", the fixed expression for "there is/are", which runs together as /i.lja/ — three written words, two spoken syllables. Then "sept jours" keeps its "t" but does not link, since "jours" begins with a consonant. "Dans une" does link: /dɑ̃.z‿yn/, with the silent "s" of "dans" surfacing.
Seeing "sept", English speakers reach for "September" and pronounce the "p", giving "sept" as in the abbreviation for the month. There is no "p" sound. The related trap is the vowel: some learners lengthen it toward "say", but /ɛ/ is short and open — think "set", "bet", "net". This is one of the easiest French numbers to say correctly once you delete that letter from your mental image of the word.