I saw someone post yesterday that they were mid 20's and they were at Scarborough, so it looks like the sea breeze may have kicked in.
Historically I believe the ChchAWS was always warmer because it was further inland and therefore not exposed as much to the sea breeze. I'm assuming the 36C was measured in the botanic gardens, and if that was the case it would be difficult to beleive, given the botanic gardens are much closer to the sea than the ChCh AWS