Weather in St Lucia in October

How October compares

October is the 6th warmest month of the year in St Lucia and ranks 16th of 134 destinations we compare for October - see where else is hot in October. Against London's average high of 14.6°C in October, St Lucia is 14.1°C warmer by day and 16.6°C warmer at night.

Daytime and night-time in October

The typical October day in St Lucia peaks at 28.7°C, but that is an average: the warmest 10% of days reach 29.8°C or more. About 100% of days top 25°C and 1 in 14 pass 30°C. Nights average 25.0°C; one night in ten drops to 24.0°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest October day here reached 31.4°C (2015-10-03) and the coldest night 22.2°C (2020-10-06).

Rain in October

Wet (more than 8 rainy days): about 21 days with 1 mm or more, 118 mm in total. Year to year it varies a lot - the wettest October was 2010 with 341 mm, the driest 1992 with 39 mm. Humidity averages 80%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in October

The sea averages 28.9°C - warm enough to swim (22°c+). Depending on the year it ranges from 28.3°C to 29.3°C. For the warmest sea here, come in September (29.0°C).

Sunshine and daylight

Around 4.5 hours of sunshine a day (estimated from cloud cover), 11.7 hours of daylight: the sun rises about 05:55 and sets about 17:45 local time in mid-October. Average cloud cover is 61%.

Is October 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, warm nights and easy sea temperatures

The heat is consistent rather than regularly extreme: days reaching 30°C account for just 7% of October, but humidity averages 80%, so conditions can still feel sticky. Choose loose, breathable clothing and keep anything strenuous away from the middle of the day. Evenings offer limited relief, with average lows of 25°C; accommodation with effective cooling is a sensible priority if you struggle to sleep in warmth. The sea averages 28.9°C, making swimming appealing on temperature alone, though that does not tell you about conditions on the day. October suits travellers who enjoy warmth throughout the day and evening, rather than those who need cool nights.

The catch is rain, not a lack of warmth

Rain is the main reason to think carefully about October. About 21 days receive measurable rainfall, so wet weather belongs in your plans rather than being treated as an unlikely interruption. That figure does not mean it rains all day, but it does make a rigid schedule of outdoor activities a poor fit. Sunshine averages about 4.5 hours within 11.7 hours of daylight: there is scope for time in the sun, but you should not expect clear skies throughout. Pack a light waterproof and keep your daily plans flexible. If reliable holiday weather matters more than travelling specifically in October, February, March and January are stronger choices overall.