German · Pronunciation Guide
dair ZOM-uh. The s buzzes like a z, the o is short and rounded, and -er softens into 'uh'.
The first syllable owns the word and the second is a soft trailing vowel. Seasons in German are all masculine and all take im for 'in the season' — im Sommer, im Winter — and in that phrase the noun keeps its stress while im passes through almost unheard.
Listen: der Sommer
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Der Sommer ist sehr heiß.
The summer is very hot.
Listen: Der Sommer ist sehr heiß.
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Der Sommer ist sehr heiß closes on heiß, whose ei is the 'eye' diphthong and whose ß is a plain hissing s. Sehr contributes a long 'ay' with a vocalised r, so the sentence has two vocalised r sounds and not a single consonantal one.
The English word summer supplies an unrounded central vowel and a real r, and the German word gets both wrong from most learners as a result. Buzz the s, round the o, and let the ending be a plain dark vowel. The spelling similarity is a trap rather than a help here.