With the sun will come a fresh breeze which will provide some welcome relief from the heat, he said.
"It doesn't get too hot because we've got that easterly flow."
Inland towards Hamilton, where Parachute Music Festival is being held this weekend, the wind is likely to be weaker and temperatures are likely to be higher, he said.
The wind in some parts of the Bay could reach 30 to 40 knots offshore. In the Coromandel it is expected to be about 15 to 20 knots. "It will certainly be something the boaties will notice. I think there will be a bit more swell."