I investigate energy transfer in a donor-acceptor pair beyond the weak system-bath coupling limit. I identify a transition from coherent to incoherent transfer dynamics with increasing temperature, due to multi-phonon effects not captured by a standard weak-coupling treatment. The resulting crossover temperature has a marked dependence on the degree of spatial correlation between fluctuations experienced at the two system sites. For strong correlations, this leads to the possibility of coherent dynamics surviving into a high temperature regime.