| Iron Ladder Beach | New South Wales | Tasman Sea | 18.3°C(64.9°F) | January, February, March, April | Live SST → |
| Island Beach | New South Wales | Tasman Sea | 17°C(62.6°F) | January, February, March, April | Live SST → |
| Jetty Beach | Tasmania | Tasman Sea | 12°C(53.6°F) | January, February, March, April | Live SST → |
| Jibbon Beach | New South Wales | Tasman Sea | 18.2°C(64.8°F) | January, February, March, April | Live SST → |
| Jiguma Beach | New South Wales | Tasman Sea | 16.3°C(61.3°F) | January, February, March, April | Live SST → |
| Johnsons Beach | Queensland | Coral Sea | 22.6°C(72.7°F) | January, February, March, April, May, October, November, December | Live SST → |
| Johnsons Beach | Tasmania | Tasman Sea | 12.1°C(53.8°F) | January, February, March, April | Live SST → |
| Jolly Beach | South Australia | Coastal Waters | 14.7°C(58.5°F) | January, February, March, April | Live SST → |
| Jones beach | New South Wales | Tasman Sea | 17.8°C(64°F) | January, February, March, April | Live SST → |
| Jones Beach | Tasmania | Tasman Sea | 12.3°C(54.1°F) | January, February, March, April | Live SST → |
| Jubilee Beach | Tasmania | Tasman Sea | 12.2°C(54°F) | January, February, March, April | Live SST → |
| Kabbijgup Beach | Western Australia | Coastal Waters | 17.6°C(63.7°F) | January, February, March, April | Live SST → |
| Kellys Beach | Queensland | Coral Sea | 21°C(69.8°F) | January, February, March, April, November, December | Live SST → |
| Kelvedon Beach | Tasmania | Tasman Sea | 12.2°C(54°F) | January, February, March, April | Live SST → |
| Kendalls Beach | New South Wales | Tasman Sea | 17.8°C(64°F) | January, February, March, April | Live SST → |
| Kennedia Beach | Tasmania | Tasman Sea | 12.2°C(54°F) | January, February, March, April | Live SST → |
| Killalea Beach | New South Wales | Tasman Sea | 17.8°C(64°F) | January, February, March, April | Live SST → |
| Killarney Beach | Victoria | Coastal Waters | 13.8°C(56.8°F) | January, February, March, December | Live SST → |
| Killick Beach | New South Wales | Tasman Sea | 20.5°C(68.9°F) | January, February, March, April | Live SST → |
| King George Beach | South Australia | Coastal Waters | 14.6°C(58.3°F) | January, February, March, December | Live SST → |
| Kings Beach | Queensland | Coral Sea | 21.5°C(70.7°F) | January, February, March, April, November, December | Live SST → |
| Kings Beach (Nude) | New South Wales | Coral Sea | 21.3°C(70.3°F) | January, February, March, April, December | Live SST → |
| Kingston Beach | Tasmania | Tasman Sea | 12°C(53.6°F) | January, February, March, April | Live SST → |
| Kioloa Beach | New South Wales | Tasman Sea | 17°C(62.6°F) | January, February, March, April | Live SST → |
| Kirra Beach | New South Wales | Coral Sea | 21.4°C(70.5°F) | January, February, March, April, December | Live SST → |
| Knights Beach | South Australia | Coastal Waters | 14°C(57.2°F) | January, February, March, December | Live SST → |
| Koombana Bay Beach | Western Australia | Coastal Waters | 16.5°C(61.7°F) | January, February, March, April | Live SST → |
| Koonya Beach | Tasmania | Tasman Sea | 12°C(53.6°F) | January, February, March, April | Live SST → |
| Kurrawa Beach | Queensland | Coral Sea | 21.4°C(70.5°F) | January, February, March, April, December | Live SST → |
| Kutti Beach | New South Wales | Tasman Sea | 18.4°C(65.1°F) | January, February, March, April | Live SST → |
| Ladies Bay | South Australia | Coastal Waters | 14°C(57.2°F) | January, February, March, December | Live SST → |
| Lady Bay Beach | New South Wales | Tasman Sea | 18.4°C(65.1°F) | January, February, March, April | Live SST → |
| Lady Martins Beach | New South Wales | Tasman Sea | 18.4°C(65.1°F) | January, February, March, April | Live SST → |
| Lagoon Beach | Tasmania | Tasman Sea | 12.2°C(54°F) | January, February, March, April | Live SST → |
| Lagoon Beach | Tasmania | Tasman Sea | 12°C(53.6°F) | January, February, March, April | Live SST → |
| Lagoon Beach | Lord Howe Island | Tasman Sea | 19.2°C(66.6°F) | January, February, March, April, December | Live SST → |
| Lamberts Beach | Queensland | Coral Sea | 22.7°C(72.9°F) | January, February, March, April, May, October, November, December | Live SST → |
| Langfords Beach | Tasmania | Tasman Sea | 12°C(53.6°F) | January, February, March, April | Live SST → |
| Ledge Beach Road | Western Australia | Coastal Waters | 17.6°C(63.7°F) | February, March, April, May | Live SST → |
| Leekes Beach | Australia | Coral Sea | 21.7°C(71.1°F) | January, February, March, April, November, December | Live SST → |
| Leighton Beach | Western Australia | Coastal Waters | 18.6°C(65.5°F) | January, February, March, April | Live SST → |
| Lemons Beach | Tasmania | Tasman Sea | 12.1°C(53.8°F) | January, February, March, April | Live SST → |
| Lighthouse Beach | New South Wales | Tasman Sea | 19.2°C(66.6°F) | January, February, March, April, May, December | Live SST → |
| Lighthouse Beach | New South Wales | Tasman Sea | 19.7°C(67.5°F) | January, February, March, April | Live SST → |
| Lightouse Jetty Beach | Tasmania | Tasman Sea | 12.2°C(54°F) | January, February, March, April | Live SST → |
| Lillico Beach | Tasmania | Tasman Sea | 12.2°C(54°F) | January, February, March, April | Live SST → |
| Lisdillon Beach | Tasmania | Tasman Sea | 12.3°C(54.1°F) | January, February, March, April | Live SST → |
| Little Austinmer Beach | New South Wales | Tasman Sea | 18.3°C(64.9°F) | January, February, March, April | Live SST → |
| Little Beach | New South Wales | Tasman Sea | 18.3°C(64.9°F) | January, February, March, April | Live SST → |
| Little Beach | New South Wales | Tasman Sea | 18.9°C(66°F) | January, February, March, April, December | Live SST → |