It's always /ˈdʒægjʊə/ in 'Standard British' RP English pronunciation*.
In the US it seems that /ˈdʒægwɑːr/ or /ˈdʒægjʊɑːr/ as one of the posters mentioned are the norm.
Remember US English prefers the rhotic 'r' as does Scottish English and therefore Scottish pronunciation would be another variant as in /ˈdʒægjʊər/
*As Scotland is part of Britain, the term 'Standard British' only refers to England and Wales and as such the term 'British' English is somewhat misleading!
Hope that helps...