Yearly & Monthly weather - Castries City, Saint Lucia

The beautiful city of Castries, Saint Lucia

The climate of Castries City

Castries City, the capital of Saint Lucia, offers a predominantly Tropical Rainforest climate, identified by the Köppen climate classification as Af. This classification implies that all 12 months of the year have a mean temperature above 18°C (64.4°F). Its geographical location directly contributes to its climate, with the city located in the tropics region.

Throughout the year, Castries City presents a variation in monthly temperatures, with the higher end of the spectrum at 30°C (86°F) and the lower end at 22°C (71.6°F). A unique trait of this tropical paradise is the consistency in the maximum temperatures, ranging from 28°C (82.4°F) to 30°C (86°F) across the calendar year. Minimum temperatures too maintain a steady range between 22°C (71.6°F) to 24°C (75.2°F), signifying mild temperature swings.

Rainfall patterns depict a different story. June to December marks the period of substantial rainfall, with the peak reaching a remarkable 303mm (11.93") in October. The lowest rainfall, on the other hand, is recorded in February and March at 104mm (4.09") and 99mm (3.9") respectively. Rainfall days show a similar trend, with a high of 24 days in September and a low of 11 days in April.

Solar parameters such as UV index, daylight hours, and sunshine hours remain quite constant throughout the year. Daylight hours span from 11.3 hours in December to a maximum of 12.9 hours in June and July. Sunshine hours remain steady at 8 hours across most months, with a slight dip to 7 hours in October. Sea temperatures stay within the comfort zone from 26°C (78.8°F) to 29°C (84.2°F), making marine activities viable throughout the year.

The best time to visit Castries City

Factoring in the weather variables, the ideal time for visiting Castries City falls from February to April. These months see comparatively lower rainfall, with February and March recording 104mm (4.09") and 99mm (3.9"), paralleled with fewer rainfall days, thus increasing the chance of an uninterrupted holiday.

The worst time to visit Castries City

From a visitor perspective, the period from September to November could be challenging owing to the increased rainfall, peaking to 303mm (11.93") in October and high rainfall days, reaching up to 24 days in September.

Spring weather in Castries City

During the spring months from March to May, Castries City experiences a gradual increase in temperature, from 28°C (82.4°F) to 30°C (86°F). Corresponding night temperatures see a subtle rise from 22°C (71.6°F) to 24°C (75.2°F). Rainfall too escalates from 99mm (3.9") to 145mm (5.71"), indicating the onset of the wetter period of the year.

Summer weather in Castries City

Summer, from June to August, brings the peak of rainfall in Castries City. Rainfall volume intensifies from 209mm (8.23") to 291mm (11.46"), complemented with a substantial increase in rainfall days from 19 days to 21 days. While temperatures maintain consistency around 30°C (86°F).

Autumn weather in Castries City

Autumn, during September to November, continues to be a period of substantial rainfall, peaking in October with 303mm (11.93"). Despite a gradual decrease in temperature, from 30°C (86°F) to 29°C (84.2°F), the weather remains warm and inviting.

Winter weather in Castries City

The winter months, namely December to February, are relatively drier, with rainfall reducing from 176mm (6.93") to 104mm (4.09"). The temperature, however, remains steady, with little variation from 28°C (82.4°F) to 29°C (84.2°F) during days, and a comforting 22°C (71.6°F) at nights.

Weather in January

January tops the year off in Castries City, with consistent warmth and a slight chance of rain. Rainfall tends to be on the heavier side, with a monthly total of 137mm (5.39") over 17 days. Transparency in the air coupled with the warmth gives the city a distinctive charm in the new year. Weather in January »

Weather in February

The weather in Castries City undergoes a minor shift in February, with a slight decrease in rainfall. The city experiences 104mm (4.09") of precipitation spread over 13 days. Unlike January, February provides clearer skies, leading to better opportunities for stargazing and late-night outings. Weather in February »

Weather in March

The arrival of March in the city marks a slight transition in weather conditions. With a minor storm getting over, March sees just 99mm (3.9") of precipitation spread evenly over 13 days. Shiny days are more common, and the sunlight seems to flood the city more brilliantly than before. Weather in March »

Weather in April

The vibrant and sun-filled April brings noticeable changes to Castries City. There is a minor increase in rainfall, with the city recording 113mm (4.45") throughout the month. Along with the onset of warmer days, the city sees a rise in outdoor events and picnics. Weather in April »

Weather in May

The increasing heat in Castries City during May leads towards the onset of the wet season, with the city experiencing 145mm (5.71") of rainfall. Evenings in the city become a treat with the calm winds and retreating sun creating an alluring ambiance. Weather in May »

Weather in June

June in Castries City represents the peak of the hot season with temperatures maintaining their steadiness. With the arrival of dense clouds, the city receives a hefty 209mm (8.23") of rain. Locals and tourists indulge in indoor activities and vibrant cultural events designed to beat the heat and enjoy the city's spirit. Weather in June »

Weather in July

July in Castries City sees the height of the wet season, with rainfall peaking at 291mm (11.46"), the highest throughout the year. The onset of heavy showers sets an energetic tone for indoor events, while the aroma of damp earth enriches the city's charm. Weather in July »

Weather in August

The month of August brings a gradual decrease in rainfall to Castries City, with the metric reaching 263mm (10.35"). Alongside a retreat in heavy rains, the sun starts taking a central stage, paving the way for more outdoor activities. Weather in August »

Weather in September

September in Castries City carries the wet season forward, receiving substantial 259mm (10.2") of rainfall. Despite its reputation as a wet month, this period allows the city to exhibit a perfect blend of sun and rain. The bustling streets under the warm afternoon sun and chilling showers spice up the City's life. Weather in September »

Weather in October

October reveals a different climate texture in Castries City, with the rainfall peaking in this time at 303mm (11.93"). With heavy showers dominating the city's weather, the ambiance transitions into a relaxing and soothing state. Weather in October »

Weather in November

Castries City witnesses an easing in weather conditions in November, with slightly decreased rainfall of 278mm (10.94"). As the month progresses, the prospect of sunnier days increases, offering a delightful blend of weather conditions. Weather in November »

Weather in December

December brings the year to a close in Castries City, with a final sharp decrease in rainfall to 176mm (6.93"). This transition marks a shift from the rather wet weather to an inviting sun-filled atmosphere, perfect for celebrating the holiday season. Weather in December »

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest in Castries City?

Castries City experiences the lowest of its temperatures in January through March and December, when the average high-temperatures rise to 28°C (82.4°F).

How much does it rain in Castries City?

Throughout the year, in Castries City, there are 208 rainfall days, and 2377mm (93.58") of precipitation is accumulated.

What is the month with the most sunshine in Castries City?

The months with the most sunshine in Castries City, Saint Lucia, are January through September, November and December, with an average of 8h of sunshine.

What are the months with the coldest sea water in Castries City?

February and March, with an average sea temperature of 26°C (78.8°F), are months with the coldest seawater.

What is the driest month in Castries City?

The month with the least rainfall in Castries City, Saint Lucia, is March, when the rain falls for 13 days and typically collects 99mm (3.9") of precipitation.

What is the month with the highest UV index in Castries City?

The months with the highest UV index in Castries City, Saint Lucia, are March through September, with an average maximum UV index of 12.

What is the hottest time of year in Castries City?

The warmest period, with an average high-temperature of 30°C (86°F), falls in May through October.

When are the longest days in Castries City?

With an average of 12h and 54min of daylight, June has the longest days of the year in Castries City.

When is the sea warmest in Castries City?

The months with the warmest seawater are September and October, with an average sea temperature of 29°C (84.2°F).

What is the wettest month in Castries City?

The month with the most rainfall is October, when the rain falls for 18 days and typically aggregates up to 303mm (11.93") of precipitation.

What is the month with the least sunshine in Castries City?

October has the least sunshine of the year in Castries City, with an average of 7h of sunshine.

What is the month with the shortest days in Castries City?

With an average of 11h and 18min of daylight, December has the shortest days of the year in Castries City, Saint Lucia.

Is there Daylight Saving Time (DST) in Castries City?

Castries City does not utilize Daylight Saving Time (DST). AST timezone is used throughout the entire year.

When is the lowest UV index in Castries City?

December is the month with the lowest UV index, with an average maximum UV index of 8.

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Long-term

Year J F M A M J J A S O N D

Average temperature
Castries City, Saint Lucia

Average high temperature in January:
28°C
Average high temperature in February:
28°C
Average high temperature in March:
28°C
Average high temperature in April:
29°C
Average high temperature in May:
30°C
Average high temperature in June:
30°C

Average high temperature in July:
30°C
Average high temperature in August:
30°C
Average high temperature in September:
30°C
Average high temperature in October:
30°C
Average high temperature in November:
29°C
Average high temperature in December:
28°C

The warmest months (with the highest average high temperature) are May, June, July, August, September and October (30°C).
The months with the lowest average high temperature are January, February, March and December (28°C).

Average low temperature in January:
22°C
Average low temperature in February:
22°C
Average low temperature in March:
22°C
Average low temperature in April:
23°C
Average low temperature in May:
24°C
Average low temperature in June:
24°C

Average low temperature in July:
24°C
Average low temperature in August:
24°C
Average low temperature in September:
24°C
Average low temperature in October:
23°C
Average low temperature in November:
23°C
Average low temperature in December:
22°C

The months with the highest average low temperature are May, June, July, August and September (24°C).
The coldest months (with the lowest average low temperature) are January, February, March and December (22°C).

Average rainfall
Castries City, Saint Lucia

The wettest month (with the highest rainfall) is October (303mm).
The driest month (with the least rainfall) is March (99mm).

Average rainfall days
Castries City, Saint Lucia

Average rainfall days in January:
17 days
Average rainfall days in February:
13 days
Average rainfall days in March:
13 days
Average rainfall days in April:
11 days
Average rainfall days in May:
15 days
Average rainfall days in June:
19 days

Average rainfall days in July:
21 days
Average rainfall days in August:
20 days
Average rainfall days in September:
24 days
Average rainfall days in October:
18 days
Average rainfall days in November:
19 days
Average rainfall days in December:
18 days

The month with the highest number of rainy days is September (24 days).
The month with the least rainy days is April (11 days).

Average sea temperature
Castries City, Saint Lucia

Average sea temperature in January:
27°C
Average sea temperature in February:
26°C
Average sea temperature in March:
26°C
Average sea temperature in April:
27°C
Average sea temperature in May:
28°C
Average sea temperature in June:
28°C

Average sea temperature in July:
28°C
Average sea temperature in August:
28°C
Average sea temperature in September:
29°C
Average sea temperature in October:
29°C
Average sea temperature in November:
28°C
Average sea temperature in December:
27°C

The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are February and March (26°C).

Average daylight / Average sunshine
Castries City, Saint Lucia

Average daylight in January:
11h and 2min
Average daylight in February:
11h and 4min
Average daylight in March:
12h and 1min
Average daylight in April:
12h and 3min
Average daylight in May:
12h and 5min
Average daylight in June:
12h and 5min

Average daylight in July:
12h and 5min
Average daylight in August:
12h and 4min
Average daylight in September:
12h and 1min
Average daylight in October:
11h and 5min
Average daylight in November:
11h and 3min
Average daylight in December:
11h and 2min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

The months with the most sunshine are January, February, March, April, May, June, July, August, September, November and December (Average sunshine: 8h).
The month with the least sunshine is October (Average sunshine: 7h).

Average UV index
Castries City, Saint Lucia

The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).

Climate and monthly weather forecastCastries City, Saint Lucia

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