| Matarangi Beach | Waikato | Fiji Sea | 14.8°C(58.6°F) | January, February, March, April | Live SST → |
| Matawhenua | Chatham Islands Territory | Coastal Waters | 11.2°C(52.2°F) | January, February, March, April | Live SST → |
| Matuku-takotako / Sumner Beach | Canterbury | Tasman Sea | 10.4°C(50.7°F) | January, February, March, December | Live SST → |
| Maukutea Beach | Waikato | Tasman Sea | 14.2°C(57.6°F) | January, February, March, April | Live SST → |
| Maunganui Beach | Chatham Islands Territory | Coastal Waters | 11.4°C(52.5°F) | January, February, March, April | Live SST → |
| Mautohe Cathedral Cove | Waikato | Fiji Sea | 15.2°C(59.4°F) | January, February, March, April | Live SST → |
| Measly Beach | Otago | Tasman Sea | 10.7°C(51.3°F) | January, February, March, April | Live SST → |
| Medlands Beach | Auckland | Fiji Sea | 14.7°C(58.5°F) | January, February, March, April | Live SST → |
| Medlands Beach | Tasman District | Tasman Sea | 12.9°C(55.2°F) | January, February, March, December | Live SST → |
| Merita Beach | Northland | Fiji Sea | 15.6°C(60.1°F) | January, February, March, April | Live SST → |
| Midway Beach | Gisborne District | Coastal Waters | 13.9°C(57°F) | January, February, March, April | Live SST → |
| Milford Beach | Auckland | Fiji Sea | 14.3°C(57.7°F) | January, February, March, April | Live SST → |
| Millars Beach | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, April | Live SST → |
| Mission Bay Beach | Auckland | Fiji Sea | 14.3°C(57.7°F) | January, February, March, April | Live SST → |
| Moeraki Beach | Otago | Tasman Sea | 10.7°C(51.3°F) | January, February, March, December | Live SST → |
| Monro Beach | West Coast | Tasman Sea | 12.8°C(55°F) | January, February, March, April | Live SST → |
| Moonlight Beach | West Coast | Tasman Sea | 12.9°C(55.2°F) | January, February, March, April | Live SST → |
| Morrison Beach | Southland | Tasman Sea | 11°C(51.8°F) | January, February, March, April | Live SST → |
| Moses Corner | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, April | Live SST → |
| Motu Roa Beach | Marlborough District | Tasman Sea | 12.7°C(54.9°F) | January, February, March, April | Live SST → |
| Muriwai Beach | Auckland | Tasman Sea | 14.5°C(58.1°F) | January, February, March, April | Live SST → |
| Murphy Beach | West Coast | Tasman Sea | 12.8°C(55°F) | January, February, March, April | Live SST → |
| Murray Beach | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, April | Live SST → |
| Murrays Mistake | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, April | Live SST → |
| Narrow Neck Beach | Auckland | Fiji Sea | 14.3°C(57.7°F) | January, February, March, April | Live SST → |
| Nettle Beach | West Coast | Tasman Sea | 13.1°C(55.6°F) | January, February, March, April | Live SST → |
| New Brighton Beach | Canterbury | Tasman Sea | 10.3°C(50.5°F) | January, February, March, December | Live SST → |
| New Chums Beach | Waikato | Fiji Sea | 14.8°C(58.6°F) | January, February, March, April | Live SST → |
| Newdicks Beach | Bay of Plenty | Fiji Sea | 14.8°C(58.6°F) | January, February, March, April | Live SST → |
| Newton Beach | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, April | Live SST → |
| Ngāmotu Beach | Taranaki | Tasman Sea | 14°C(57.2°F) | January, February, March, April | Live SST → |
| Ngārui-o-te-Marangai Beach | Northland | Fiji Sea | 15.3°C(59.5°F) | January, February, March, April | Live SST → |
| Ngarunui Beach | Waikato | Tasman Sea | 14.3°C(57.7°F) | January, February, March, April | Live SST → |
| Nine Mile Beach | West Coast | Tasman Sea | 13.1°C(55.6°F) | January, February, March, April | Live SST → |
| No Mans Beach | Southland | Tasman Sea | 12.6°C(54.7°F) | January, February, March, April | Live SST → |
| North Beach | West Coast | Tasman Sea | 13.1°C(55.6°F) | January, February, March, April | Live SST → |
| North Beach | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, December | Live SST → |
| North Piha Beach | Auckland | Tasman Sea | 14.5°C(58.1°F) | January, February, March, April | Live SST → |
| O'Neill Bay Beach | Auckland | Tasman Sea | 14.5°C(58.1°F) | January, February, March, April | Live SST → |
| Oakura Bay | Northland | Fiji Sea | 15.8°C(60.4°F) | January, February, March, April | Live SST → |
| Observation Beach | Tasman District | Tasman Sea | 12.9°C(55.2°F) | January, February, March, December | Live SST → |
| Ocean Beach | New Zealand | Fiji Sea | 14.3°C(57.7°F) | January, February, March, April | Live SST → |
| Ocean Beach | Bay of Plenty | Fiji Sea | 14.7°C(58.5°F) | January, February, March, April | Live SST → |
| Ocean Beach | Northland | Fiji Sea | 15.1°C(59.2°F) | January, February, March, April | Live SST → |
| Ocean Beach | Southland | Tasman Sea | 11.1°C(52°F) | January, February, March, April | Live SST → |
| Ocean Beach | Hawke's Bay | Tasman Sea | 13.4°C(56.1°F) | January, February, March, April | Live SST → |
| Ocean Beach | Wellington | Tasman Sea | 12.7°C(54.9°F) | January, February, March, December | Live SST → |
| Ōhinerangi Beach | Auckland | Fiji Sea | 14°C(57.2°F) | January, February, March, April | Live SST → |
| Ōhope Beach | Bay of Plenty | Fiji Sea | 14.7°C(58.5°F) | January, February, March, April | Live SST → |
| Ohuka Beach | Waikato | Fiji Sea | 14°C(57.2°F) | January, February, March, April | Live SST → |