A Dutch tourist hasn't been seen since Saturday morning and police are concerned for his welfare.

Ken Boogers, 26, went walking on the Hilltop Track in the Wharariki Beach area of Golden Bay at 9am on Saturday.

He was walking in a red and purple shirt and beige shorts and had bare feet with no other gear. He has long hair tied back in a ponytail.

Mr Boogers missed a planned dinner on Sunday and his friends raised the alarm.

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Police said there had been heavy rain in the area and they were concerned the tourist was not equipped for the conditions.

Four search and rescue teams and a helicopter are searching the area today and police would like to speak to anyone who has been in the Wharariki area over the weekend, and anyone who has walked on the Hilltop Track or the Green Hills route.

Anyone with information should contact Nelson Police 03 546 3840 or Takaka Police 03 525 9211.