Daily maximum temperatures are normally in the mid to low 20s (°C) over most of the country. They are higher in northern, eastern and interior part of the country; Hastings is the warmest city on average with 25.5 °C followed by Gisborne with 24.9 °C and Napier with 24.5 °C.

Historically and in 2026, the Northland region, specifically the city of Whangarei and the Bay of Islands, is considered the warmest part of New Zealand. Often referred to as the "winterless north," this region enjoys a subtropical climate where daytime temperatures in winter rarely dip below 15°C (59°F) and summer temperatures frequently exceed 25°C (77°F). Because it is the northernmost part of the country, it receives the most direct sunlight and is less influenced by the cold southerly winds from the Antarctic that affect the South Island. For those seeking "sunniest" rather than just warmest, Nelson and Napier often battle for the title of highest annual sunshine hours, but for consistent, year-round warmth and high humidity, Northland remains the undisputed champion. This makes the region a premier destination for horticulture, citrus farming, and year-round water sports like sailing and diving at the Poor Knights Islands.