St Lucia weather in September 2025

Expect 24°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in St Lucia in September. Check more long-term weather averages for St Lucia in September before you book your next holiday to South Africa in 2025/2026.

  • 24°C maximum daytime temperature in September in St Lucia24
    24°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in St Lucia9
    9 days with some rainfall
  • 16°C minimum night-time temperature in September in St Lucia16
    16°C min night temperature
  • 12 hours of daylight per day in September in St Lucia12
    12 hours of daylight per day
  • No heat & humidity in September in St Lucia0
    No heat & humidity
  • 87 mm monthly rainfall in September in St Lucia87
    87 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in St Lucia8
    8 (Very High) UV index
  • 22°C sea temperature in September in St Lucia22
    22°C sea temperature

More about St Lucia

St Lucia by month

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

Recommended for South Africa

TUI: up to 7% off holidays booked online

  • 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

TUITUI deal finder

The September weather guide for South Africa (St Lucia) 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 / mm)  |  Imperial (°F / inches)

Back to top

More about South Africa

How hot is it in St Lucia in September?

Daytime temperatures usually reach 24°C in St Lucia in September, falling to 16°C at night.

How sunny is it in St Lucia in September?

There are normally 7 hours of bright sunshine each day in St Lucia in September - that's 62% of daylight hours.

How warm is the sea around St Lucia in September?

The average sea temperature around St Lucia in September is 22°C.

Does it rain in St Lucia in September?

There are usually 9 days with some rain in St Lucia in September and the average monthly rainfall is 87mm.

St Lucia September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:04 17:37
Monday, 15th September 2025 05:48 17:43
Tuesday, 30th September 2025 05:30 17:51

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^