Weather in St Lucia in March

How March compares

March is the 9th warmest month of the year in St Lucia and ranks 26th of 134 destinations we compare for March - see where else is hot in March. Against London's average high of 10.5°C in March, St Lucia is 17.4°C warmer by day and 20.2°C warmer at night.

Daytime and night-time in March

The typical March day in St Lucia peaks at 27.9°C, but that is an average: the warmest 10% of days reach 29.0°C or more. About 100% of days top 25°C and 1 in 67 pass 30°C. Nights average 23.5°C; one night in ten drops to 22.4°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest March day here reached 30.9°C (2010-03-08) and the coldest night 20.9°C (2000-03-23).

Rain in March

Wet (more than 8 rainy days): about 11 days with 1 mm or more, 30 mm in total. Year to year it varies a lot - the wettest March was 2017 with 72 mm, the driest 2010 with 11 mm. Humidity averages 71%.

Sea temperature in March

The sea averages 26.7°C - warm enough to swim (22°c+). Depending on the year it ranges from 26.3°C to 27.1°C. For the warmest sea here, come in September (29.0°C).

Sunshine and daylight

Around 6.7 hours of sunshine a day (estimated from cloud cover), 11.9 hours of daylight: the sun rises about 06:12 and sets about 18:14 local time in mid-March. Average cloud cover is 44%.

Is March a good time to visit St Lucia?

It is a reasonable choice: hot days but expect showers. The best months for St Lucia on our scoring are February, March, January; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Hot enough for swimming, with little evening chill

Pack for consistently hot days rather than a mixture of warm and cool weather. Days reach 25°C throughout March, while only 2% reach 30°C, so the appeal is dependable warmth rather than extreme temperatures. Humidity averages 71%, which can make the heat feel more demanding when you are active. Keep strenuous plans away from midday if you dislike feeling hot, and favour loose, breathable clothing. Evenings offer limited relief, with average lows of 23.5°C, so heavy layers are unlikely to earn their space in your bag. The sea averages 26.7°C, making March a good fit for travellers who want swimming to be part of their holiday.

Expect sunshine, but leave room for rain

March brings about 6.7 hours of sunshine within 11.9 hours of daylight, so there is a useful amount of sun without a promise of clear skies all day. Rain falls on about 11 days during the month. That makes a light waterproof and flexible outdoor plans sensible, even though March sits among St Lucia's better months overall. The figures do not tell you when rain will arrive or how long it will last, so avoid building your holiday around guaranteed dry afternoons. This month suits travellers happy to adjust their plans around wet weather; it is less suitable if uninterrupted sunshine is your main reason for going.