MetService forecaster Samkelo Magwala said temperatures peaked in the Deep South, in Alexandra and Oamaru, which both reached about 27°C about noon.
However, a cool front brought temperatures down to 21°C degrees by mid-afternoon.
Dunedin reached a high of 25°C about 7am, after which it dropped, rising again to 25°C at 1pm, but fading away in the afternoon.
Queenstown reached 21°C and Invercargill was one of the cooler places in the South, recording a high of 19°C.
Mr Magwala said another warm front should arrive later this week, although it would be "not as strong" as the weekend’s.
In a social media post, the Queenstown Lakes District Council said there was localised flooding and trees down around the resort yesterday.
Mt Aspiring Rd, Greenstone Rd and Paradise Rd were all thought to be affected by the flooding and crews were busy cleaning up and clearing roads of debris.
Mt Aspiring Rd, which was closed earlier at Glenfinnian Bluffs due to a car being left abandoned in a flooded area, reopened at 3.35pm.
The Clutha District Council closed the Mt Cooee landfill due to strong winds.
It was another day of wild weather for many around the country, warnings of high temperatures, strong winds and heavy rain being in place.
As well as heat alerts and temperatures well above 30°C in Hawkes Bay and Canterbury, several warnings for rain and strong winds were in place in the South Island yesterday.
Napier reached 37.1°C, while neighbouring Hastings was also forecast to hit that mark. Heat warnings were also in place for many other areas, including Whangārei, Whitianga, Tauranga, Whakatāne, Rotorua, Taupō, Gisborne and Blenheim.
Flights out of Wellington Airport were cancelled due to strong winds.
Strong wind knocked over trees and powerlines early in the morning, closing State Highway 94 (the Milford road). The route reopened about 10.30am.
There were also partial blockages due to fallen trees on SH73 in Canterbury and SH6 on the West Coast.
— Allied Media / additional reporting RNZ
