Spring downpours lead to flooding in parts of the lower North Island yesterday.

Heavy rain lashed the Kapiti Coast, leading police to warn motorists to avoid Te Horo Beach Rd.

Rain fell over much of the North Island, including Auckland and Wairarapa.

WeatherWatch analyst Philip Duncan said the dumping of rain which had Aucklanders braving the elements in rain jackets and umbrellas was predicted to ease today.

"There will be more rain in places like Auckland over the next few days with some heavy downpours and isolated thunder in Auckland and Northland by [last night].

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"But generally this shouldn't be too bad. It will . . . be more settled today, with temperatures in the mid to high teens."

The weather is also expected to improve in Wellington and Kapiti Coast, which bore the worst of the conditions yesterday.

The wild weather caused havoc for some on the water in the upper North Island.

Two people needed medical treatment in two separate water incidents that kept the coastguard and emergency services rather busy.

An Auckland coastguard spokesman said in the first incident yesterday morning, a person had to be pulled from a sinking jet-ski in Katia Bay, Whangaparaoa.

The person was wet, cold and possibly hypothermic, he said.

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"He was tended to by volunteer crew and released to the care of his family."

Shortly after 2pm yesterday the coastguard was also alerted to a vessel in the Bay of Islands dragging its anchor into the rocks.

They monitored the situation as the vessel had two anchors and the sole occupant was not in imminent danger.

In the third incident just before 3pm a person on a yacht just off Bastion Pt in Waitemata Harbour received a head injury and was treated by Westpac Rescue paramedics at Orakei Marina.

The coastguard spokesman said it had been a pretty rough day out at sea, but fortunately most people had heeded advice and stayed out of the water.