Saint Lucia (Castries) weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: December – July
What is the weather like in Saint Lucia (Castries) in May?
In May, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 27.8 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 13 rainy days and 45 mm in total. The air is often humid and muggy. All in all, May is an excellent month for a holiday in Saint Lucia (Castries).
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 12 h 46 min05:37 – 18:23
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 24 km/haverage daily peakAll months
- Cloud cover
- 59 %on averageAll months
- Hot days
- 4 days30 °C or moreAll months
- Time zone
- UTC−4America/St_Lucia
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %95 %
- Few rainy daysweight 20 %36 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in May
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Saint Lucia (Castries) in May: quick answers
Is Saint Lucia (Castries) hot in May?
Yes. In May, Saint Lucia (Castries) is hot: daytime highs average 29 °C and nights stay around 25 °C. On about 4 days the thermometer climbs to 30 °C or more.
Can you swim in Saint Lucia (Castries) in May?
Yes. In May the sea averages 27.8 °C – lovely and warm for swimming.
Does it rain much in Saint Lucia (Castries) in May?
Rain is frequent, with about 13 rainy days and 45 mm in total.
Saint Lucia (Castries) month by month
The whole year in Saint Lucia (Castries)All destinations: Saint LuciaCaribbean weather in MayWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences