Weather in Grand Isle

14-day forecast · updated today, Thursday, October 29, at 2:29 am (CDT)

Now · overcast 71 °F

Feels like: 70 °F
Low / high: 69 / 73 °F
Rain: 0%
Wind: 10 mph NNE

↘ 30.10 inHg · falling

Today in Grand Isle: overcast, 69 °F to 73 °F, with a 0% chance of rain and a gentle breeze from the north-northeast (10 mph). Tomorrow, overcast, 71 °F to 76 °F and a 8% chance of rain. The warmest day of the week is Saturday 31, at 77 °F. Next likely rain: Saturday 31 (33%).

Temperatures for the next 14 days

73° 69°
Today
76° 71°
Fri 30
77° 73°
Sat 31
76° 72°
Sun 1
75° 71°
Mon 2
76° 72°
Tue 3
74° 69°
Wed 4
71° 66°
Thu 5
69° 65°
Fri 6
69° 65°
Sat 7
70° 66°
Sun 8
69° 65°
Mon 9
71° 66°
Tue 10
69° 65°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Overcast	69 / 73 °F	0%	16 mph NE	2.1 ft	1:04 am	HRRR + NBM
Fri 30	Overcast	71 / 76 °F	8%	15 mph ENE	2.4 ft	2:11 am	NBM
Sat 31	Light drizzle	73 / 77 °F	33% · 0.05 in	13 mph E	2.4 ft	3:17 am	NBM
Sun 1	Light drizzle	72 / 76 °F	19%	11 mph ENE	2.1 ft	3:20 am	NBM
Mon 2	Light drizzle	71 / 75 °F	1%	13 mph E	2.7 ft	4:23 am	NBM
Tue 3	Light drizzle	72 / 76 °F	17% · 0.02 in	15 mph ESE	2.6 ft	5:59 am	NBM
Wed 4	Light showers	69 / 74 °F	32% · 0.40 in	16 mph SSW	2.7 ft	9:21 am · 10:16 pm	NBM
Thu 5	Light rain	66 / 71 °F	21% · 0.06 in	13 mph NW	2.4 ft	9:18 pm	NBM
Fri 6	Overcast	65 / 69 °F	4% · 0.02 in	11 mph NW	2.5 ft	9:03 pm	NBM
Sat 7	Overcast	65 / 69 °F	7% · 0.09 in	11 mph NE	2.0 ft	9:19 pm	NBM
Sun 8	Overcast	66 / 70 °F	9% · 0.07 in	11 mph ENE	1.7 ft	9:47 pm	NBM + ECMWF
Mon 9	Overcast	65 / 69 °F	12%	13 mph NNE	1.0 ft	10:20 pm	ECMWF
Tue 10	Mainly clear	66 / 71 °F	12%	10 mph NNE	0.7 ft	10:56 pm	ECMWF
Wed 11	Overcast	65 / 69 °F	8%	15 mph NNW	1.0 ft	11:36 pm	ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 9:00 pm; then NBM until Sunday 8 7:00 pm; then ECMWF until Thursday 12 9:00 am; then GFS.

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	Partly cloudy	Overcast	Overcast	Mainly clear	Mainly clear	Overcast	Mainly clear	Partly cloudy
Temperature	72°	71°	69°	70°	73°	73°	73°	72°
Chance of rain	0%	0%	0%	0%	0%	0%	0%	0%
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)	7 NE	11 NNE	14 NE	16 NE	13 NE	8 NE	15 ENE	11 ENE
Humidity	73%	69%	78%	81%	77%	80%	83%	80%
UV	0	0	0	1	6	3	0	0
Model	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	NBM

Do the models agree?

Low confidence

They don't agree on rain on Sunday 1: it may change, so check again closer to the day.

What 6 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	74°	75°	76°	75°	76°	77°	77°
AIFS	74°	75°	76°	75°	76°	76°	76°
GFS	79°	82°	82°	83°	82°	82°	79°
ICON	76°	77°	79°	75°	77°	77°	77°
HRRR	73°	74°	—	—	—	—	—
NBM	74°	76°	77°	76°	75°	76°	74°
Confidence	high	high	high	high	high	high	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0	0.01 in	0.01 in	0.02 in	0.01 in	0.69 in
AIFS	0	0.06 in	0.18 in	0.46 in	0.10 in	0.00 in	0.14 in
GFS	0	0	0	0	0.01 in	0.13 in	0.13 in
ICON	0	0.01 in	0.19 in	0.08 in	0	0	0.04 in
HRRR	0	0	—	—	—	—	—
NBM	0	0	0.05 in	0	0	0.02 in	0.39 in
Confidence	high	high	medium	low	high	high	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	1521	1724	1521	1518	1926	1930	1627
AIFS	15	15	15	19	22	22	17
GFS	1416	1322	1621	1421	1522	1823	1823
ICON	918	921	919	613	1123	1021	516
HRRR	1619	1623	—	—	—	—	—
NBM	1419	1521	1317	1115	1318	1520	1621
Confidence	high	high	high	medium	medium	medium	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	0%	15%	22%	41%	8%	31%	40%
GFS (GEFS, 31 scenarios)	0%	77%	91%	67%	32%	42%	48%
NBM (NOAA)	0%	8%	33%	19%	1%	17%	32%
Thunderstorm (NBM)	0%	7%	19%	18%	4%	10%	13%

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.

Next few weeks, compared with normal: normal temperatures, a bit wetter and a slightly warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Above +2.9 °F	Above +88%	Above +1.8 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit below −1.3 °F	Normal	A bit above +1.1 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +1.1 °F	A bit above +29%	A bit above +0.7 °F	69° / 65°
Nov 23 – Nov 29Nov 23–Nov 29	Normal −0.5 °F	Above +53%	A bit above +0.5 °F	66° / 63°
Nov 30 – Dec 6Nov 30–Dec 6	A bit below −1.3 °F	Above +79%	Normal −0.2 °F	64° / 61°

Coming months

When	TemperatureTemp.	Rain	Sea
November	Normal +0.5 °F	Above +63%	—
December	A bit below −1.4 °F	A bit above +27%	—
January	A bit below −2.0 °F	A bit above +22%	—
February	A bit below −2.2 °F	Above +51%	—
March	A bit below −1.4 °F	A bit above +44%	—

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.

Grand Isle climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Grand Isle is from March to May and from October to November: highs of 71 °F to 83 °F, about 8 rainy days a month and 7 hours of sunshine a day.

Hurricane season: from June to October, peaking in September. In the last 30 years (1996–2025), 24 tropical cyclones passed within 93 mi of Grand Isle, about 8 every 10 years; 12 of them with hurricane-force winds (74 mph or more). The most recent: Francine, in September 2024.

63° 51°

JanJ
66° 53°

FebF
71° 58°

MarM
76° 63°

AprA
83° 70°

MayM
88° 76°

JunJ
90° 78°

JulJ
90° 78°

AugA
87° 75°

SepS
81° 68°

OctO
73° 59°

NovN
66° 53°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	63°	51°	4.30 in	9	4.8	64°	2.9 ft	–
FebruaryFeb	66°	53°	4.36 in	8	5.2	64°	2.8 ft	–
MarchMar	71°	58°	3.87 in	7	6.6	67°	2.7 ft	–
AprilApr	76°	63°	4.26 in	7	7.4	72°	2.7 ft	–
MayMay	83°	70°	4.78 in	9	8.8	78°	2.3 ft	–
JuneJun	88°	76°	6.32 in	15	8.2	84°	2.1 ft	4
JulyJul	90°	78°	7.59 in	19	7.7	86°	1.6 ft	3
AugustAug	90°	78°	7.76 in	19	7.6	86°	1.8 ft	6
SeptemberSep	87°	75°	6.41 in	12	7.3	84°	2.1 ft	7
OctoberOct	81°	68°	3.98 in	8	6.5	79°	2.7 ft	3
NovemberNov	73°	59°	3.57 in	7	5.9	72°	2.8 ft	1
DecemberDec	66°	53°	4.93 in	8	4.4	67°	2.8 ft	–

Month	Water	Waves	Cyclones
Jan	64°	2.9 ft	–
Feb	64°	2.8 ft	–
Mar	67°	2.7 ft	–
Apr	72°	2.7 ft	–
May	78°	2.3 ft	–
Jun	84°	2.1 ft	4
Jul	86°	1.6 ft	3
Aug	86°	1.8 ft	6
Sep	84°	2.1 ft	7
Oct	79°	2.7 ft	3
Nov	72°	2.8 ft	1
Dec	67°	2.8 ft	–

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

A normal year brings 62.14 in of rain on about 127 days and about 2,450 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

Now71 °Ffeels like 70 °F

Tomorrow71 / 76 °F

It's 71 °F now (feels like 70 °F). Today, 69 °F to 73 °F; tomorrow, 71 °F to 76 °F.

Chance of rain

Today 0%
Fri 30 8%
Sat 31 33% 0.05 in
Sun 1 19%
Mon 2 1%
Tue 3 17% 0.02 in
Wed 4 32% 0.40 in

Today the chance of rain reaches 0%. The next day with likely rain is Saturday 31: 33% and 0.05 in.

No rain in the last 7 days.

Humidity and dew point

Humidity68%

Dew point60 °F

Humidity is 68% now and the dew point is 60 °F.

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

Visibility and fog

Now16 migood

Clouds92%

Visibility is good now (16 mi). No fog expected today.

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

UV index

Now0

Today's peak6moderate

Fri 30: 5 · Sat 31: 4 · Sun 1: 5

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 Anglers expect normal activity
↘ Falling · now Anglers say fish feed more before the change

30.0030.1030.20 30.17

Falling now (−0.03 inHg in 3 hours). Over the next 48 hours: −0.04 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityGood · 47

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	Max wind
Wed 28	Mainly clear	71 / 75 °F	14 mph ENE
Tue 27	Overcast	73 / 75 °F	17 mph ENE
Mon 26	Overcast	72 / 75 °F	20 mph ENE
Sun 25	Overcast	72 / 74 °F	21 mph NE
Sat 24	Clear sky	74 / 75 °F	19 mph ENE
Fri 23	Mainly clear	68 / 76 °F	13 mph NE
Thu 22	Mainly clear	70 / 77 °F	11 mph NNE

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Clear sky	69 / 75 °F	0	15 mph NE
Tue 20	Overcast	73 / 75 °F	0	23 mph ENE
Mon 19	Light drizzle	71 / 74 °F	0.01 in	21 mph ENE
Sun 18	Light drizzle	69 / 73 °F	0.04 in	23 mph ENE
Sat 17	Overcast	64 / 72 °F	0	32 mph NNE
Fri 16	Overcast	73 / 84 °F	0	33 mph N
Thu 15	Clear sky	79 / 82 °F	0	13 mph ESE
Wed 14	Clear sky	78 / 82 °F	0	14 mph E
Tue 13	Clear sky	78 / 82 °F	0	11 mph SE
Mon 12	Overcast	78 / 82 °F	0	11 mph ESE
Sun 11	Partly cloudy	75 / 80 °F	0	8 mph S
Sat 10	Overcast	72 / 79 °F	0	23 mph NNE
Fri 9	Heavy drizzle	75 / 80 °F	0.30 in	33 mph NNE
Thu 8	Light showers	80 / 83 °F	0.37 in	31 mph NE
Wed 7	Light drizzle	80 / 84 °F	0.02 in	21 mph NE
Tue 6	Rain	80 / 83 °F	0.43 in	19 mph NE
Mon 5	Light showers	79 / 81 °F	1.08 in	16 mph NE
Sun 4	Showers	78 / 82 °F	1.68 in	19 mph SE
Sat 3	Heavy drizzle	80 / 84 °F	0.28 in	19 mph SE
Fri 2	Drizzle	83 / 85 °F	0.20 in	18 mph ESE
Thu 1	Light drizzle	83 / 85 °F	0.10 in	21 mph SE
Wed 30	Mainly clear	83 / 84 °F	0	20 mph ESE
Tue 29	Clear sky	82 / 85 °F	0	15 mph ESE

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 Grand IsleQuestions

What's the weather like today in Grand Isle?

Overcast, from 69 °F to 73 °F, with a gentle breeze from the north-northeast (10 mph) and a 0% chance of rain.

Will it rain tomorrow in Grand Isle?

On Friday 30 the chance of rain is 8% (0.00 in): overcast.

How warm will it be this week?

Between a low of 69 °F and a high of 77 °F; the warmest day, Saturday 31.

What's the UV index today?

It reaches 6 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 30.10 inHg and falling: −0.06 inHg over the last 24 hours.

When is the best time to visit Grand Isle?

The best time to visit Grand Isle is from March to May and from October to November: highs of 71 °F to 83 °F, about 8 rainy days a month and 7 hours of sunshine a day.

What is the weather like in Grand Isle in October?

In October, Grand Isle normally sees highs of 81 °F and lows of 68 °F, with about 8 rainy days (3.98 in for the month) and 6 hours of sunshine a day. The sea is around 79 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Grand Isle?

The warmest is July, with average highs of 90 °F, and the coldest January, with lows of 51 °F. The wettest is August (7.76 in) and the driest, November.

When is hurricane season in Grand Isle?

Hurricane season: from June to October, peaking in September. In the last 30 years (1996–2025), 24 tropical cyclones passed within 93 mi of Grand Isle, about 8 every 10 years; 12 of them with hurricane-force winds (74 mph or more). The most recent: Francine, in September 2024.

More about Grand Isle today

Weather near Grand Isle

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 1.2 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 2:29 am (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from