Grand Anse weather in September 2025

Q: How hot is it in Grand Anse in September?

Daytime temperatures usually reach 30°C in Grand Anse in September with very high heat and humidity, falling to 24°C at night.

Q: How sunny is it in Grand Anse in September?

There are normally 8 hours of bright sunshine each day in Grand Anse in September - that's 62% of daylight hours.

Q: How warm is the sea around Grand Anse in September?

The average sea temperature around Grand Anse in September is 29°C.

Q: Does it rain in Grand Anse in September?

There are usually 25 days with some rain in Grand Anse in September and the average monthly rainfall is 224mm.

Q: What is the chance of a cyclone in Grand Anse in September?

On average 1.1 days in September in Grand Anse are likely to be affected by the passage of one or more tropical storms.

Expect 86°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Grand Anse in September. Check more long-term weather averages for Grand Anse in September before you book your next holiday to St Lucia in 2025/2026.

86
86°F max day temperature
8
8 hours of sunshine per day
25
25 days with some rainfall
75
75°F min night temperature
12
12 hours of daylight per day
VH
Very High heat & humidity
8.8
8.8 inches of monthly rainfall
11
11+ (Extreme) UV index
84
84°F sea temperature

More about Grand Anse

Grand Anse by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for St Lucia

TUI: up to 7% off holidays booked online

Sale

Book online with TUI & save up to 7% on holidays
FREE child places available for select holidays
Pay £0 deposits with direct debit & spread the cost

Go to TUI deal >>

View all TUI offers

TUI deal finder

Destination

The September weather guide for St Lucia (Grand Anse) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

More about St Lucia

How hot is it in Grand Anse in September?

Daytime temperatures usually reach 86°F in Grand Anse in September with very high heat and humidity, falling to 75°F at night.

How sunny is it in Grand Anse in September?

There are normally 8 hours of bright sunshine each day in Grand Anse in September - that's 62% of daylight hours.

How warm is the sea around Grand Anse in September?

The average sea temperature around Grand Anse in September is 84°F.

Does it rain in Grand Anse in September?

There are usually 25 days with some rain in Grand Anse in September and the average monthly rainfall is 8.8 inches.

What is the chance of a hurricane in Grand Anse in September?

On average 1.1 days in September in Grand Anse are likely to be affected by the passage of one or more tropical storms.

Grand Anse September sunrise & sunset times

Browse the sunrise and sunset times for Grand Anse in September 2025. Select a month to view Grand Anse sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Monday, 1st September 2025	05:52	18:15
Monday, 15th September 2025	05:52	18:05
Tuesday, 30th September 2025	05:53	17:54

Be inspired

Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers

We promise not to share your details

Popular travel offers

St Lucia - quick facts
Flight time^✝	9 hours
Time difference	UK -4 hours
Language(s)	English
Currency	Eastern Caribbean Dollar
Electricity	G plug (230V)
Driving side	Left
Why visit?	Beaches Nature
Tourist info	Saint Lucia Tourism Authority