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Castries Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castries.
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Climate overview of Castries
Castries, Castries, Saint Lucia, enjoys a steady climate throughout the year, with daytime temperatures typically around 30°C (86°F). September is the warmest month at 31°C (88°F), while January is the coolest at 29°C (84°F).
Castries sees a moderate amount of rainfall, totalling around 948 mm (37 in) per year. It experiences a distinct dry season from February to March, creating some seasonal variation. The sunniest month is May, with 8.3 hours of sunshine per day on average.
Castries Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castries - and find the best time to visit.
Monthly Temperature in Castries
The temperature in Castries remains steady throughout the year, providing a consistently very warm climate. Average maximum daytime temperatures range from a very warm 31°C (88°F) in September, the warmest time of the year, to a comfortable 29°C (84°F) during cooler months like January.
At night, you can expect temperatures ranging from 26°C (79°F) in September to around 24°C (75°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castries
Generally, Castries has a moderate amount of precipitation, averaging 948 mm (37 in) of rainfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, October it receives high rainfall, averaging 133 mm (5.2 in) of precipitation, recorded across 18 rainy days. In contrast, the driest month February brings less rainfall, with 36 mm (1.4 in) over 13 rainy days. For more details, please visit our Castries Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Castries
Year-round, Castries offers plenty of sunlight to enjoy during your holiday. The difference between the sunniest month, May, with 8.3 hours of daily sunshine, and October, the least sunny month, with 7.1 hours, is minimal.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Saint Lucia, Saint Lucia (4 KM, 2 Miles).
Daily hours of sunshine
Data from: Saint Lucia, Saint Lucia (4 KM, 2 Miles).
Humidity in Castries by Month
The relative humidity is high throughout the year in Castries.
The city experiences its highest humidity in November, reaching 84%. In April, the humidity drops to its lowest level at 76%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Saint Lucia, Saint Lucia (4 KM, 2 Miles).
Best Time to Visit Castries
Conditions in Castries are generally most comfortable in January and February. They are typically least comfortable in August, September, October and November.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
excellent
Feb
excellent
Mar
good
Apr
good
May
good
Jun
good
Jul
good
Aug
mixed
Sep
mixed
Oct
mixed
Nov
mixed
Dec
good
- Best overall: January and February
- Warmest weather: April, May, June, July, August, September, October, November and December
- Most sunshine: January, March, April, May, June, July, August, September, November and December
- Fewest rainy days: February, March and April
- Seasonal pattern: A distinct dry season from February to March
Frequently asked questions about the climate in Castries
What is the best time to visit Castries?
January and February typically offer the most optimal weather in Castries. In contrast, August, September, October and November tend to have less optimal conditions. Castries has a distinct dry season from February to March.
What temperatures can I expect in Castries?
Daytime highs range from 29°C (84°F) in January to 31°C (88°F) in September. Nighttime lows range from 24°C (75°F) to 26°C (79°F). Temperatures stay relatively stable year-round.
How much rain does Castries get?
Annual rainfall is around 948 mm (37 in). October is the wettest month with 133 mm (5.2 in), while February is the driest with 36 mm (1.4 in).
How sunny is Castries?
Castries receives around 2,880 hours of sunshine per year. May is the sunniest month with 249 hours, while October is the cloudiest with just 214 hours. Overall, Castries enjoys abundant sunshine.
Castries 3-Day Forecast
Castries on the map
Castries is highlighted - select any city to see its climate.
Popular in October
Where to go in October - average daytime high across popular destinations.
Marigot Bay
31°C (88°F) Laborie30°C (86°F) Rodney Bay Village30°C (86°F) Cap Estate
30°C (86°F) Soufrière30°C (86°F) Castries31°C (88°F) Gros Islet30°C (86°F) Vieux Fort30°C (86°F) Bucket list
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