What's the weather like in St Lucia in September?
St Lucia’s in the eastern Caribbean Sea, close to where it meets the North Atlantic Ocean. It’s close to the equator which means you'll have tropical weather that’s nice and hot in September. North easterly winds will help to keep you cool along with pleasant breezes on the coast. The wet season’s from June to November so you'll get quite a lot of rain in September however there’s still plenty of sun.
The average high in St Lucia is 31ºC in September so you can look forward to plenty of time on the beach. Temperatures only fall to 24ºC at night, meaning you won’t need anything more than shorts and t-shirt for the evenings. The sea temperature’s 29ºC, which is perfect for swimming, while humidity’s high. You should probably bring a waterproof jacket as there’s 193mm of rain over 19 days. You can still expect 12 hours of daylight with eight hours of sunshine each day. UV levels will be extremely high so don't forget your sun cream. The sun goes down at around 6pm.