Nouméa weather in September
September in Nouméa: warm, a little rain, with clean air — one of the best months to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#1 of 12 months in Nouméa · #230 of 1413 destinations to visit in September · comfort 90/100 (tier S)
- Days
- 23°C
- Nights
- 18°C
- Wet days
- 7
- Sun
- 10.3 h
- Humidity
- 76%
- Daylight
- 12 h
Traveller notes on Nouméa in September
Other months in Nouméa
Forum posters describe May as the start of New Caledonia's cooler season (roughly May through October), a real change from the hotter, more humid November-through-April stretch that runs closer to 30C. Posters cite typical May daytime temperatures not far above 20C, with sunny days occasionally reaching around 25C, and water staying warm enough (never below 21C) that swimming and diving remain fully comfortable regardless. Posters describe May as slow season for tourism, meaning accommodation is easy to book on short notice and boats out to the Île des Pins are rarely full. Posters generally rate May as a comfortable, uncrowded time to visit Noumea, cooler and drier than peak summer without sacrificing swimmable water temperatures.
Forum posters name the September-through-December stretch as New Caledonia's peak window, describing November specifically as mild, dry and less humid than the hot season that follows from December onward. Posters consistently rate this shoulder period as more comfortable than the full heat of the November-to-April hot season, with one visitor describing the local weather as warm, humid and sometimes windy but absolutely beautiful overall. Posters generally recommend packing sunscreen and reef shoes for the warm, swimmable water regardless of exact dates. Posters consistently rate November as one of the better months to visit Noumea, ahead of the hotter, more humid peak of summer.
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Nouméa climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Nouméa in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyNew Caledonia Day, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Nouméa's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherNouméa's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Nouméa in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Humpbacks in the southern lagoon
1 Jul – 30 Sep · usuallyWhale seasonBook earlyHumpbacks calve inside the reef in the sheltered water south of Nouméa, an hour or two out by boat from Prony. The window is short and the licensed operators sell out on the good-weather weekends.
- Season
The alizés blow hardest
1 Sep – 31 DecWind seasonThe south-east trades come in most afternoons from spring and turn the Anse Vata into one of the more reliable kite and windsurf spots anywhere. Anyone wanting flat water goes out early or crosses to the leeward side.
- Holiday
New Caledonia Day
24 SepNational holidayClosures24 September marks the 1853 French annexation, since reframed as a citizenship day, and it is read very differently across the territory. A public holiday, and not a neutral one. Source ↗
Where is Nouméa?
Nouméa in September — FAQ
- Is September a good time to visit Nouméa?
- September in Nouméa: warm, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Nouméa on SeasonMap's comfort score (90/100).
- What is the weather like in Nouméa in September?
- In September, Nouméa averages a daily high of 23.4°C and a low of 18.3°C, with about 42.8 mm of rain over roughly 6.5 rainy days.
- What is the air quality in Nouméa in September?
- Nouméa has a mean US Air Quality Index of about 38 in September.