Sea temperature and swimming season in Nouméa
The sea off Nouméa is comfortable for swimming all year round — it never drops below 22.8°C, and peaks at 27.5°C in February.
Month by month
Sea temperature, the air you climb out into, and the wind that decides how that feels.
| Month | Sea | Air | Wind | Feels | What to wear |
|---|---|---|---|---|---|
| January | 27.4°C | 26.0°C ↓ | 6.0 m/s | Bath-like | none needed |
| February | 27.5°C | 26.5°C ↓ | 4.8 m/s | Bath-like | none needed |
| March | 27.1°C | 25.9°C ↓ | 5.2 m/s | Bath-like | none needed |
| April | 26.4°C | 24.8°C ↓ | 5.2 m/s | Bath-like | none needed |
| May | 25.1°C | 22.6°C ↓ | 4.9 m/s | Very comfortable | none needed |
| June | 24.2°C | 22.5°C ↓ | 4.0 m/s | Very comfortable | none needed |
| July | 23.4°C | 20.6°C ↓ | 3.9 m/s | Very comfortable | none, or a rash vest |
| August | 22.8°C | 21.3°C ↓ | 4.9 m/s | Very comfortable | none, or a rash vest |
| September | 22.8°C | 21.5°C ↓ | 4.6 m/s | Very comfortable | none, or a rash vest |
| October | 23.7°C | 22.1°C ↓ | 5.7 m/s | Very comfortable | none, or a rash vest |
| November | 25.1°C | 24.2°C ↓ | 5.7 m/s | Very comfortable | none needed |
| December | 26.6°C | 26.7°C | 4.4 m/s | Bath-like | none needed |
Air is the average daily maximum — roughly what you would meet swimming in the middle of the day. An arrow marks months where the air is colder than the sea.
When in the day can you swim?
Daylight and burn risk by month, in Pacific/Noumea local time.
| Month | Sunrise | Sunset | Daylight | Peak UV |
|---|---|---|---|---|
| January | 05:23 | 18:43 | 13h 21m | 14.4 |
| February | 05:43 | 18:33 | 12h 50m | 14.3 |
| March | 05:56 | 18:10 | 12h 14m | 12.9 |
| April | 06:06 | 17:41 | 11h 35m | 10.2 |
| May | 06:18 | 17:22 | 11h 03m | 7.7 |
| June | 06:31 | 17:17 | 10h 47m | 6.3 |
| July | 06:33 | 17:26 | 10h 53m | 6.7 |
| August | 06:18 | 17:38 | 11h 20m | 8.5 |
| September | 05:51 | 17:48 | 11h 57m | 11.1 |
| October | 05:22 | 17:57 | 12h 35m | 13.0 |
| November | 05:03 | 18:13 | 13h 10m | 13.9 |
| December | 05:04 | 18:33 | 13h 29m | 14.2 |
Open water burns faster than a beach: the surface reflects sunlight up at you, and sunscreen washes off in the first few minutes. A long swim under a UV index above 6 needs a rash vest more than it needs more cream.
What the bands mean
| From | Description | In practice |
|---|---|---|
| above 26°C | Bath-like | Warm enough that it offers no cooling at all |
| above 22°C | Very comfortable | Swimwear, no time limit for most people |
| above 19°C | Comfortable | Pleasant once you are in; most people swim happily |
| above 16°C | Bracing | Swimmable but short; many prefer a shorty wetsuit |
| above 12°C | Cold | Wetsuit territory. Unprotected swims should be brief |
| below 12°C | Dangerous | Cold shock risk. Specialist gear and supervision |
Do you need a wetsuit in Nouméa?
No. The sea here never falls below 22.8°C, so there is no month in which neoprene is the thing standing between you and a comfortable swim. A rash vest is worth having, but for the sun on your back rather than for warmth — the surface burns while you swim, and you will not feel it happening.
Other coastal cities in New Caledonia
Where these numbers come from, and what they miss
- Open water, not your beach. The measurement is a satellite cell about 28 km across, centred 13.6 km from Nouméa. Shallow bays and lagoons run warmer; exposed coasts with upwelling run colder, sometimes by several degrees.
- Surface temperature. Below a few metres the sea is often noticeably colder, and in summer a warm surface layer can sit over much colder water.
- A six-year average, not a thirty-year normal. Sea temperature varies little between years, so this is close — but it is not a climate normal, and any individual year will differ.
- Averages hide storms. A monthly mean says nothing about the week a cold current arrives.