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Castries Weather in May
In Castries, May brings very high daytime temperatures around 31°C (88°F), with nights cooling to 25°C (77°F). Some rainfall is to be expected.
Rainfall in Castries in May
This month experiences about 15 days of rain according to historical data, averaging 59 mm (2.3 in). Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Castries in May
In May, Castries gets very high temperatures, with highs of 31°C (88°F). Nights cool to around 25°C (77°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. With overnight lows of 25°C (77°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Castries in May
With approximately 249 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.Should you favor a climate that's both dry and comfortably warm, January and February typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Castries Temperature in May
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
51%
Precipitation
59 mm (2.3 in)
Rainy days
15 days
Humidity
76% *
Sunshine
249 hours *
Percentage Sunshine
*
* Data from: Saint Lucia, Saint Lucia (4 KM, 2 Miles).
Castries Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castries - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Castries typically stay consistent throughout May, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in May
Historical weather records for Castries in May
Browse day-by-day weather records for Castries spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Castries historical weather extremes in May
The extremes listed below come from historical weather data collected in Castries from 1976 through 2026.
- The hottest May day on record in Castries reached 39°C (102°F) (May 2, 2015).
- The lowest daytime temperature in May was 25°C (77°F), recorded on May 10, 1986.
- Castries registered its coldest May night on May 12, 1979, with temperatures dropping to 19°C (66°F).
Best Places in Saint Lucia in May
Find out more about the weather in Saint Lucia and which places have the best travel conditions in this month. See all of Saint Lucia in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Castries in May
Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Castries in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming10/10 -
Cycling8/10 -
Walking8/10 -
Barbeque10/10 -
Camping7/10 -
Outdoor sports8/10
Castries 3-Day Forecast
More climate data for Castries
Temperature Rainfall Sunshine Humidity
See the full Castries climate overview or explore weather in Saint Lucia.
Popular in May
Where to go in May - average daytime high across popular destinations.
Marigot Bay
31°C (88°F) Laborie30°C (86°F) Castries31°C (88°F) Soufrière30°C (86°F) Rodney Bay Village30°C (86°F) Cap Estate30°C (86°F) Gros Islet30°C (86°F) Vieux Fort30°C (86°F) Bucket list
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