Castries Climate

Last updated: January 18, 2025

Castries, Saint Lucia, is characterized by a tropical rainforest climate (Köppen-Geiger class Af), offering residents and visitors a warm and inviting atmosphere throughout the year. Temperatures range from a comfortable minimum of 21°C (71°F) in February to an average of 27°C (80°F), peaking at 32°C (90°F) in September. This consistent warmth, coupled with high humidity, creates a lush environment that supports diverse ecosystems and enhances the region's vibrant beauty.

Castries temperature by month

In Castries, Saint Lucia, temperature patterns reveal a consistent tropical warmth throughout the year, with a few seasonal variations. The coolest months occur in January and February, with minimums around 21-22°C (71-72°F) and averages of 25-26°C (78-79°F). As spring approaches in March and April, temperatures gradually begin to rise, reaching maximums of 30-31°C (86-87°F). The peak warmth is experienced in the summer months of May through September, where average temperatures hover around 27-28°C (81-83°F) and maximums reach up to 32°C (90°F) in September. By fall, from October to December, temperatures stabilize, maintaining a pleasant range with minimums around 24-25°C (76-77°F) and average values reflecting a return to the early year's averages. Overall, Castries boasts a warm climate marked by subtle seasonal variations, inviting year-round enjoyment of its natural beauty.

Monthly Temperatures in Castries, Saint Lucia

The chart illustrates Castries's temperature patterns throughout the year, with values aggregated from various locations across the region. It highlights seasonal variations and temperature changes across the months.
JanFebMarAprMayJunJulAugSepOctNovDec787878798181818282818079
Data source: Castries temperature data aggregated from multiple regional locations, generated using Copernicus Climate Change Service information.
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The average of daily temperatures (24 hours) calculated across all days in the month.

Castries experiences a range of temperatures throughout the year, with February seeing a minimum of 21°C (71°F) and September reaching a maximum of 32°C (90°F). For more detailed climate information, visit monthly temperatures in Castries.

Precipitation Patterns in Castries

Castries, Saint Lucia experiences a distinct precipitation pattern throughout the year, characterized by a relatively dry beginning and a significantly wetter climax during the summer and early fall. The first few months of the year—January through April—demonstrate lower rainfall levels, generally ranging from 33 to 39 mm (1.3 to 1.6 in), with rain occurring on about 12 to 15 days each month. As the region transitions into the wetter months of June and July, precipitation escalates dramatically, culminating in July averages reaching 105 mm (4.1 in) and rain on an average of 24 days.

The peak precipitation occurs in September and October, where rainfall totals can soar to 121 mm (4.8 in) and 128 mm (5.1 in), respectively, indicating the height of the rainy season. During these months, the frequency of rainy days is also elevated, further emphasizing the climactic shift. Following this peak, November sees a drop in precipitation to 103 mm (4.1 in), and by December, rainfall reduces to 46 mm (1.8 in), signaling the return to drier conditions for the next year. This cyclical precipitation pattern not only influences the local climate but also plays a crucial role in shaping the region's lush tropical landscape.

Monthly Average Precipitation in Castries, Saint Lucia

The average monthly precipitation in Castries, providing insights into seasonal rainfall patterns and the region's precipitation trends throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec36333835396510511312112810346
Data source: Castries precipitation data aggregated from multiple regional locations, generated using Copernicus Climate Change Service information.
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Sunshine Duration in Castries

In Castries, Saint Lucia, sunshine duration exhibits a notable seasonal progression, with increasing hours of sunshine as the year unfolds. The early months of January and February see 268 and 304 hours of sunshine, respectively, laying a gentle foundation as the island emerges from the cooler winter months. As March arrives, there is a significant uptick, culminating in 345 hours, which marks the beginning of a steady rise toward the sunniest months. The peak occurs in May, with an impressive 355 hours, signaling the height of the dry season when clear, sunny days dominate the landscape.

Following May, sunshine remains abundant, with hours consistently above 320 hours until November. Notably, June through August maintains a commendable average around 325 to 348 hours, reinforcing the idea of summer as a time of plentiful sunlight. As the year transitions into the wetter months of September and October, a slight decline is observed, dropping to 319 and 320 hours respectively. However, the overall trend remains robust, with sunshine hours steadily bouncing back in November (314 hours) and December (330 hours), thereby supporting the vibrant ecosystems and cultural vibrancy of this tropical paradise throughout the year.

Monthly Sunshine in Castries, Saint Lucia

Monthly sunshine duration represents the total hours of direct sunlight Castries receives each month, excluding periods when the sun is obscured by clouds or other obstructions.
JanFebMarAprMayJunJulAugSepOctNovDec268h304h345h336h355h325h348h346h319h320h314h330h
Data source: Castries sunshine duration data aggregated from multiple regional locations, generated using Copernicus Climate Change Service information.

Castries UV Index Trends

Castries, Saint Lucia, experiences a consistently high UV Index throughout the year, underscoring the importance of sun safety for residents and visitors. The UV Index peaks during the spring and summer months, reaching an intense 14 in March, April, May, August, and September, which is classified as extreme. During these months, the recommended burn time is a mere 10 minutes, highlighting the immediate risk of skin damage from sun exposure. Even in January, the UV Index starts at a notable 10, categorized as very high, reflecting the region's strong solar radiation levels right from the onset of the year.

As fall approaches, the UV Index begins to decline, with November dropping to 10 and December to 9, though these values still signify significant UV exposure. The exposure category remains predominantly in the very high to extreme range until late in the year, indicating that protective measures such as sunscreen, protective clothing, and hats are crucial throughout the seasons. The consistent UV radiation levels in Castries not only contribute to its lush tropical environment but also serve as a reminder of the health risks associated with prolonged sun exposure, necessitating increased awareness and caution.

Monthly Maximum UV Index for Castries, Saint Lucia

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Castries. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141313141412109
Data source: Castries UV Index data aggregated from multiple regional locations, generated using Copernicus Climate Change Service information.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Daylight Hours in Castries

In Castries, Saint Lucia, daylight duration shows a consistent pattern throughout the year, with approximately 11 hours of sunlight from January to February. As the spring months approach, daylight increases slightly, reaching 12 hours in March and continuing through the summer months. This steady allotment of 12 hours of daylight—from March to September—ensures ample time for outdoor activities, tourism, and agricultural practices, enhancing the region's vibrant lifestyle and ecosystem.

As autumn arrives, daylight duration begins to decrease once again, dropping back to 11 hours from October through December. Despite this reduction, the overall variability in daylight is minimal, showcasing the relatively stable climate of Castries. The consistent sunlight hours provide a picturesque backdrop for the island's rich culture and natural beauty, contributing to the enjoyable tropical environment that attracts visitors year-round. The predictability in daylight duration allows residents and tourists to plan their activities with confidence, ensuring that they can make the most of the island's stunning landscapes and lively atmosphere.

Average Monthly Daylight Hours in Castries, Saint Lucia

This chart shows the total daylight hours Castries receives each month, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 23m11h 40m12h 3m12h 26m12h 45m12h 55m12h 50m12h 33m12h 10m11h 47m11h 28m11h 18m
Data source: Castries daylight hours, calculated based on aggregated data for various regional locations, determined by the times between sunrise and sunset.

Climate Highlights of Castries's Popular Destinations

Castries, Saint Lucia, enjoys a tropical climate characterized by warm temperatures year-round. Average monthly temperatures range from 26°C (78°F) in January to 28°C (82°F) in the peak summer months of August and September, with maximum temperatures reaching up to 32°C (90°F). The region experiences significant rainfall, particularly from June to October, with September and October receiving the highest precipitation levels of 121 mm (4.8 in) and 128 mm (5.1 in), respectively. Despite the rains, Castries benefits from ample sunshine, averaging around 304 hours in February and peaking at 355 hours in May. For more detailed information, visit Castries climate.

Conclusion

In conclusion, the climate of Castries, Saint Lucia, is characterized by its tropical warmth, abundant sunshine, and a distinct seasonal variation in precipitation and UV exposure. With temperatures consistently hovering between 21°C to 32°C and an impressive amount of daylight throughout the year, the region offers a welcoming environment for both residents and visitors. The UV Index remains predominantly high, particularly during the spring and summer months, emphasizing the need for sun safety. Coupled with diverse rainfall patterns, with a notable peak during the wet season, the climate not only supports lush landscapes but also enriches the cultural vibrancy of the island. Overall, understanding these climatic elements is essential for fostering a sustainable relationship with this beautiful tropical paradise.

Discover the Climate of Castries's Places

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