Event organiser Graham Teahan said the hot weather was hampering some competitors.
"It's a hot day. The issues are water, sunblock, especially for people from the Northern Hemisphere countries, they aren't aware of the what the sun can do here," Mr Teahan said.
The races finished up about 4pm and a prizegiving was held afterwards.
Owners of Kaiawa Station, where the events took place, Craig and Janet Morrison, said they had been preparing food for the day to raise money for the Te Wharau community hall.
"The district's been fabulous and all baked and a local farmer donated meat for the sausages. It's been a tremendous country district effort," Mrs Morrison said. "The hall is expensive to keep going because it's district-owned not council-owned, so we have been fundraising to keep it going."