Weather in St Lucia in April

How April compares

April is the 7th warmest month of the year in St Lucia and ranks 26th of 134 destinations we compare for April - see where else is hot in April. Against London's average high of 13.5°C in April, St Lucia is 15.0°C warmer by day and 19.0°C warmer at night.

Daytime and night-time in April

The typical April day in St Lucia peaks at 28.5°C, but that is an average: the warmest 10% of days reach 29.7°C or more. About 100% of days top 25°C and 1 in 17 pass 30°C. Nights average 24.1°C; one night in ten drops to 23.0°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest April day here reached 30.9°C (1998-04-07) and the coldest night 21.4°C (2019-04-08).

Rain in April

Wet (more than 8 rainy days): about 12 days with 1 mm or more, 39 mm in total. Year to year it varies a lot - the wettest April was 2011 with 99 mm, the driest 1997 with 12 mm. Humidity averages 73%.

Sea temperature in April

The sea averages 27.1°C - warm enough to swim (22°c+). Depending on the year it ranges from 26.6°C to 27.5°C. For the warmest sea here, come in September (29.0°C).

Sunshine and daylight

Around 5.8 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 05:51 and sets about 18:17 local time in mid-April. Average cloud cover is 53%.

Is April 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 days without much relief at night

April feels firmly hot rather than gently warm, especially with humidity at 73%. Light, loose clothing will be more useful than a typical UK spring wardrobe, and air conditioning is worth prioritising if warm nights affect your sleep. Days reaching 30°C are relatively uncommon, at 6%, but that does not make midday a comfortable time for sustained activity. Plan anything energetic for the cooler edges of the day and leave room for shade and breaks. Evenings remain warm, so you are unlikely to want heavy layers for temperature alone. This suits travellers who enjoy consistent warmth more than those who prefer cool sleeping conditions.

Plan for rain rather than uninterrupted sunshine

Rain is the main compromise: about 12 days have measurable rainfall, so a completely dry holiday is not something to count on. That does not tell you how long rain will last on any particular day, and it would be unwise to assume it only falls briefly or overnight. Sunshine averages about 5.8 hours within 12.3 hours of daylight, leaving plenty of daylight that is not necessarily sunny. Keep outdoor plans flexible, carry a light waterproof and have an alternative for wet spells. April works better for someone happy to adapt than for someone whose holiday depends on clear skies throughout.

Warm water is a strong reason to go

The sea is a clear advantage in April. At 27.1°C on average, it is warm enough for swimming without the bracing entry associated with cooler water. The year-to-year range of 27°C to 28°C also makes sea warmth a fairly dependable part of the decision, although temperature alone cannot tell you about conditions on the day. A swimming-focused holiday therefore makes sense if you can accept some rain between sunny periods. Bring swimwear alongside sun protection and something light to cover up in. For travellers who value warm water more than uninterrupted sunshine, April offers a sensible balance, with wet weather the main catch.