How many vowel sounds in autumn?

Let's break down the word "autumn" to count the vowel sounds:

* a (as in "cat") - 1 vowel sound

* u (as in "put") - 1 vowel sound

* u (as in "put") - 1 vowel sound (this "u" is silent)

* m (consonant)

* n (consonant)

Therefore, there are two vowel sounds in "autumn".