From Hull AWE
The adjective contemporary (which is also used substantively - see also contemporaneous - contemporary), with its adverb contemporarily, can give difficulty with its pronunciation - as indeed can temporary and temporarily.
- It is written with five syllables, con- + -tem- + -por- + -ar- + -y.
- Careful speakers, speaking carefully, realize all five, with the stress on the second, IPA: /kɒn 'tɛm pə rə rɪ/.
- A realization with four syllables, 'con-TEMP-or-y', IPA: /kɒn 'tɛm pə rɪ/, is also common, even in formal educational contexts.
- In careless, rushed or casual colloquial speech, this is often further reduced to three syllables: 'con-TEMP-ry', IPA: /kɒn 'tɛm prɪ/.
- The same, broadly, is true of the adverb contemporarily - with an extra final syllable -ly in all cases.