The nationwide average temperature for the month was 12.7 degrees centigrade - 0.6 degrees above the 1981 to 2010 average.
Record or near-record sunshine hours for the month were also observed in 10 locations from Balclutha to Kaitaia.
The sunniest four locations to the year ending October 31, were Bleinheim with 2239 hours, Whakatane with 2212, Appleby 2189 and Lake Tekapo with 2149.
For Lake Tekapo October was the sunniest month since records began in 1928.
Of the six main centres last month, Auckland was the warmest, Christchurch was the coolest, driest and sunniest, Dunedin was the wettest and Hamilton was the cloudiest.
Record rainfall in October
Record maximum air temperature in October
Record sunshine hours in October
Main centre climate statistics in October