Federated Farmers is demanding the government invests more money in building water storage as temperatures heat up.
Figures released by the National Institute of Water and Atmospheric Research (Niwa) show the past decade was the hottest since records began in 1960.
The figures show the years 2000-2009 were slightly warmer than the 1980s, the previous hottest decade since records began.
Federated Farmers president Don Nicolson says while New Zealand does not have a lack of water, it lacked the means to store it.
He warns without more funding, that situation will only get worse.
Nicolson says if tens of millions of dollars can be spent on emissions trading schemes then it is lunacy not to put the same commitment into water storage.