Last night was a hot night for many also, with temperatures forecast to remain 19C or higher.
At 5.54pm yesterday humidity was at 73 per cent according to the Metservice.
MetService duty forecaster Leigh Matheson said the hot conditions and humidity were the result of subtropical air reaching the country.
"We've had a lot of subtropical air trapped over the North Island, with a ridge of high pressure, so it's been fairly warm and humid for many places for the last few days.
"And it's stayed pretty stationary for quite some time thanks to a couple of slow-moving weather patterns."
Metservice predicted showers to fall in Tauranga from this afternoon with light winds. Temperatures were expected to reach 25C today and 21C overnight before getting even stickier tomorrow with showers and a high of 27C during the day and 20C overnight.
The humidity is expected to stick around for the next few days.
"As we push into Wednesday, we start to see more cloud going around the eastern areas and showers spreading over the North Island," Ms Matheson said.
"So it doesn't mean that everyone sees a shower, but they'll be more widespread through the [North] Island."