Weather in Koumac

14-day forecast · updated today, Thursday, October 29, at 11:10 am (GMT+11)

Now · clear sky 80 °F

Feels like: 87 °F
Low / high: 72 / 80 °F
Rain: 45% · 0.02 in
Wind: 7 mph W

→ 30.06 inHg · steady UV 10 · very high

Today in Koumac: light drizzle, 72 °F to 80 °F, with a 45% chance of rain (0.02 in) and a light breeze from the west (7 mph). Tomorrow, light drizzle, 68 °F to 78 °F and a 27% chance of rain. The warmest day of the week is Wednesday 4, at 84 °F. Next likely rain: Saturday 31 (47%).

Temperatures for the next 14 days

80° 72°
Today
78° 68°
Fri 30
79° 66°
Sat 31
80° 66°
Sun 1
80° 65°
Mon 2
83° 65°
Tue 3
84° 68°
Wed 4
86° 69°
Thu 5
87° 70°
Fri 6
82° 69°
Sat 7
81° 69°
Sun 8
78° 68°
Mon 9
79° 69°
Tue 10
81° 65°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Light drizzle	72 / 80 °F	45% · 0.02 in	9 mph SW	3.0 ft	10:04 am · 9:24 pm	ECMWF
Fri 30	Light drizzle	68 / 78 °F	27% · 0.01 in	14 mph SSE	4.8 ft	10:59 am · 10:10 pm	ECMWF
Sat 31	Light drizzle	66 / 79 °F	47% · 0.01 in	13 mph SSE	5.6 ft	12:01 pm · 11:05 pm	ECMWF
Sun 1	Light rain	66 / 80 °F	100% · 0.28 in	6 mph SE	5.3 ft	1:12 pm	ECMWF
Mon 2	Light drizzle	65 / 80 °F	87% · 0.06 in	8 mph SSE	4.4 ft	12:23 am · 2:25 pm	ECMWF
Tue 3	Light drizzle	65 / 83 °F	85% · 0.06 in	7 mph S	3.1 ft	2:06 am · 3:30 pm	ECMWF
Wed 4	Drizzle	68 / 84 °F	92% · 0.14 in	3 mph ESE	1.8 ft	3:43 am · 4:21 pm	ECMWF
Thu 5	Light drizzle	69 / 86 °F	94% · 0.12 in	4 mph ENE	2.2 ft	4:55 am · 5:04 pm	ECMWF
Fri 6	Light drizzle	70 / 87 °F	90% · 0.09 in	5 mph E	2.0 ft	5:51 am · 5:41 pm	ECMWF
Sat 7	Drizzle	69 / 82 °F	92% · 0.24 in	7 mph S	1.5 ft	6:37 am · 6:15 pm	ECMWF
Sun 8	Light drizzle	69 / 81 °F	94% · 0.09 in	8 mph SSE	2.0 ft	7:17 am · 6:47 pm	ECMWF
Mon 9	Light drizzle	68 / 78 °F	84% · 0.24 in	8 mph S	3.4 ft	7:55 am · 7:18 pm	ECMWF
Tue 10	Light drizzle	69 / 79 °F	76% · 0.12 in	10 mph SSE	3.9 ft	8:31 am · 7:49 pm	ECMWF
Wed 11	Clear sky	65 / 81 °F	78%	11 mph SSE	4.8 ft	9:07 am · 8:19 pm	ECMWF

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Light drizzle	Partly cloudy	Partly cloudy	Mainly clear	Clear sky	Mainly clear	Light drizzle	Mainly clear
Temperature	74°	73°	74°	80°	80°	79°	75°	73°
Chance of rain	16%	11%	5%	14%	22%	11%	27%	34%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	1 NNE	1 NNE	1 NNE	3 WNW	8 W	8 WSW	9 SSW	7 S
Humidity	93%	96%	89%	69%	73%	75%	82%	89%
UV	0	0	0	6	10	4	0	0
Model	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF

Do the models agree?

Medium confidence

They broadly agree, but not quite on rain on Saturday 31: take it with some caution.

What 4 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	80°	78°	79°	80°	80°	83°	84°
AIFS	82°	80°	81°	80°	82°	83°	84°
GFS	78°	78°	80°	79°	78°	80°	84°
ICON	83°	82°	84°	83°	84°	87°	90°
Confidence	high	high	high	high	medium	medium	medium

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0.02 in	0.01 in	0.01 in	0.28 in	0.06 in	0.06 in	0.14 in
AIFS	0.02 in	0	0.07 in	0.14 in	0.09 in	0.07 in	0.12 in
GFS	0.02 in	0	0.01 in	0.01 in	0	0	0
ICON	0	0	0.00 in	0.10 in	0.08 in	0	0
Confidence	high	high	medium	medium	medium	medium	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	923	1436	1329	620	824	730	319
AIFS	10	16	9	9	5	5	4
GFS	1014	2021	1111	108	97	118	1010
ICON	1123	1939	613	513	512	513	514
Confidence	high	high	medium	high	high	high	medium

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	45%	27%	47%	100%	87%	85%	92%
GFS (GEFS, 31 scenarios)	15%	65%	75%	40%	65%	39%	35%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

The next few weeks look normal for the time of year.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	A bit above +1.3 °F	Above +87%	Normal +0.4 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal +0.7 °F	A bit below −28%	A bit above +0.7 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	Normal +0.4 °F	A bit below −48%	A bit above +0.5 °F	81° / 74°
Nov 23 – Nov 29Nov 23–Nov 29	Normal +0.4 °F	A bit below −29%	Normal +0.4 °F	81° / 75°
Nov 30 – Dec 6Nov 30–Dec 6	Normal +0.5 °F	A bit below −23%	Normal +0.4 °F	82° / 75°

Coming months

When	TemperatureTemp.	Rain	Sea
November	Normal +0.4 °F	A bit below −40%	Normal +0.4 °F
December	Normal +0.7 °F	Below −57%	A bit above +0.7 °F
January	A bit above +1.4 °F	A bit below −22%	A bit above +1.1 °F
February	A bit above +2.0 °F	A bit below −47%	A bit above +1.4 °F
March	A bit above +2.2 °F	A bit below −48%	A bit above +1.6 °F

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

Koumac climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Koumac is from July to October: highs of 77 °F to 83 °F, about 5 rainy days a month and 8 hours of sunshine a day.

Cyclone season: from January to April, peaking in March. In the last 30 years (1996–2025), 19 tropical cyclones passed within 93 mi of Koumac, about 6 every 10 years; 6 of them with hurricane-force winds (74 mph or more). The most recent: Fili, in April 2022.

87° 73°

JanJ
87° 74°

FebF
86° 73°

MarM
84° 70°

AprA
81° 67°

MayM
79° 64°

JunJ
77° 62°

JulJ
77° 62°

AugA
80° 64°

SepS
83° 66°

OctO
85° 69°

NovN
86° 71°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	87°	73°	9.61 in	14	8.0	81°	3.9 ft	4
FebruaryFeb	87°	74°	10.12 in	16	7.4	82°	4.3 ft	3
MarchMar	86°	73°	11.44 in	16	6.6	82°	4.2 ft	8
AprilApr	84°	70°	8.65 in	13	6.7	81°	4.3 ft	3
MayMay	81°	67°	4.08 in	9	6.4	79°	4.7 ft	–
JuneJun	79°	64°	3.80 in	8	6.6	76°	4.8 ft	–
JulyJul	77°	62°	3.48 in	6	7.2	75°	4.8 ft	–
AugustAug	77°	62°	3.55 in	5	7.6	74°	4.5 ft	–
SeptemberSep	80°	64°	1.68 in	5	8.8	74°	4.4 ft	–
OctoberOct	83°	66°	2.90 in	6	8.7	76°	4.1 ft	–
NovemberNov	85°	69°	4.41 in	8	8.5	78°	3.8 ft	–
DecemberDec	86°	71°	5.85 in	12	8.6	80°	3.5 ft	1

Month	Water	Waves	Cyclones
Jan	81°	3.9 ft	4
Feb	82°	4.3 ft	3
Mar	82°	4.2 ft	8
Apr	81°	4.3 ft	3
May	79°	4.7 ft	–
Jun	76°	4.8 ft	–
Jul	75°	4.8 ft	–
Aug	74°	4.5 ft	–
Sep	74°	4.4 ft	–
Oct	76°	4.1 ft	–
Nov	78°	3.8 ft	–
Dec	80°	3.5 ft	1

Days: rainy days in the month. Sun: hours a day.

A normal year brings 69.57 in of rain on about 117 days and about 2,750 hours of sunshine.

Cyclones: how many tropical cyclones (tropical storms, hurricanes and typhoons) passed within 93 mi in each month from 1996 to 2025, according to IBTrACS (NOAA).

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now80 °Ffeels like 87 °F

Tomorrow68 / 78 °F

It's 80 °F now (feels like 87 °F). Today, 72 °F to 80 °F; tomorrow, 68 °F to 78 °F.

Chance of rain

Today 45% 0.02 in
Fri 30 27% 0.01 in
Sat 31 47% 0.01 in
Sun 1 100% 0.28 in
Mon 2 87% 0.06 in
Tue 3 85% 0.06 in
Wed 4 92% 0.14 in

Today the chance of rain reaches 45%, with 0.02 in in total. The next day with likely rain is Saturday 31: 47% and 0.01 in.

Recent rain: last 24 hours, 0.15 in; last 3 days, 0.83 in; last 7 days, 1.98 in.

Humidity and dew point

Humidity73%

Dew point71 °F

Humidity is 73% now and the dew point is 71 °F. With a dew point this high, it feels muggy.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now15 migood

Clouds17%

Visibility is good now (15 mi). No fog expected today.

The model gives visibility up to about 15 mi: beyond that, the horizon is clear.

UV index

Now10

Today's peak10very high

Fri 30: 13 · Sat 31: 9 · Sun 1: 11

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady · now Anglers expect normal activity
↘ Falling Anglers say fish feed more before the change

30.0030.10 30.00

Steady now (−0.02 inHg in 3 hours). It barely changes over the next 48 hours. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 26

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Rain	Max wind
Wed 28	Drizzle	70 / 85 °F	0.15 in	8 mph SSW
Tue 27	Light rain	68 / 79 °F	0.47 in	6 mph ESE
Mon 26	Heavy drizzle	66 / 83 °F	0.21 in	4 mph SE
Sun 25	Drizzle	67 / 81 °F	0.15 in	6 mph SSE
Sat 24	Light rain	66 / 80 °F	0.44 in	6 mph SE
Fri 23	Drizzle	65 / 81 °F	0.18 in	6 mph ESE
Thu 22	Rain	64 / 80 °F	0.44 in	5 mph SE

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Showers	67 / 81 °F	0.53 in	6 mph SE
Tue 20	Rain	65 / 81 °F	0.54 in	6 mph SE
Mon 19	Light rain	66 / 82 °F	0.38 in	6 mph SE
Sun 18	Light drizzle	64 / 81 °F	0.02 in	10 mph SE
Sat 17	Overcast	67 / 79 °F	0	17 mph SSE
Fri 16	Light rain	66 / 81 °F	0.24 in	14 mph SSE
Thu 15	Partly cloudy	63 / 83 °F	0	11 mph SSE
Wed 14	Light drizzle	65 / 83 °F	0.02 in	9 mph S
Tue 13	Light rain	64 / 84 °F	0.34 in	7 mph SSE
Mon 12	Light drizzle	66 / 86 °F	0.08 in	9 mph SE
Sun 11	Heavy drizzle	69 / 88 °F	0.21 in	5 mph SE
Sat 10	Light drizzle	69 / 87 °F	0.02 in	6 mph ESE
Fri 9	Drizzle	66 / 84 °F	0.15 in	8 mph SE
Thu 8	Light drizzle	65 / 85 °F	0.05 in	8 mph SSE
Wed 7	Light drizzle	66 / 83 °F	0.02 in	9 mph S
Tue 6	Light drizzle	64 / 81 °F	0.01 in	10 mph S
Mon 5	Light drizzle	66 / 82 °F	0.02 in	12 mph SSE
Sun 4	Light drizzle	64 / 82 °F	0.01 in	10 mph SSE
Sat 3	Light drizzle	65 / 80 °F	0.05 in	10 mph SSE
Fri 2	Light drizzle	64 / 79 °F	0.01 in	13 mph SSE
Thu 1	Light drizzle	65 / 78 °F	0.09 in	12 mph SSE
Wed 30	Light rain	63 / 80 °F	0.48 in	7 mph SE
Tue 29	Drizzle	62 / 80 °F	0.12 in	14 mph SSE

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in KoumacQuestions

What's the weather like today in Koumac?

Light drizzle, from 72 °F to 80 °F, with a light breeze from the west (7 mph) and a 45% chance of rain.

Will it rain tomorrow in Koumac?

On Friday 30 the chance of rain is 27% (0.01 in): light drizzle.

How warm will it be this week?

Between a low of 65 °F and a high of 84 °F; the warmest day, Wednesday 4.

What's the UV index today?

It reaches 10 (very high). Avoid the midday sun; reflection off the water adds to it.

Is the pressure rising or falling?

It's 30.06 inHg and steady: +0.02 inHg over the last 24 hours.

When is the best time to visit Koumac?

The best time to visit Koumac is from July to October: highs of 77 °F to 83 °F, about 5 rainy days a month and 8 hours of sunshine a day.

What is the weather like in Koumac in October?

In October, Koumac normally sees highs of 83 °F and lows of 66 °F, with about 6 rainy days (2.90 in for the month) and 9 hours of sunshine a day. The sea is around 76 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Koumac?

The warmest is February, with average highs of 87 °F, and the coldest August, with lows of 62 °F. The wettest is March (11.44 in) and the driest, September.

When is cyclone season in Koumac?

Cyclone season: from January to April, peaking in March. In the last 30 years (1996–2025), 19 tropical cyclones passed within 93 mi of Koumac, about 6 every 10 years; 6 of them with hurricane-force winds (74 mph or more). The most recent: Fili, in April 2022.

More about Koumac today

Weather near Koumac

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 5.1 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 11:10 am (local time).

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