Climate Chart of Castries, Saint Lucia
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For Castries, Saint Lucia, the climate data describe 2013–2023. Monthly mean temperatures averaged 26.3 °C, with the coolest monthly mean in February at 25.0 °C and the warmest in September at 27.4 °C. These figures describe month-level averages rather than daytime highs, so they offer a broad guide to the year's temperature pattern, not a forecast for any particular day.
Climate overview
Temperature
The monthly mean temperature reaches its low in February at 25.0 °C, while the highest monthly mean is 27.4 °C in September. Across the calendar-month means, the unweighted mean is 26.3 °C. These averages help set expectations for the overall temperature pattern, but they do not describe daytime maximum temperatures or the variation visitors may encounter from day to day.
Rain
For visitors prioritising lower average daily rainfall, April is the conditional option in this record, with a mean of 1.47 mm/day. The highest monthly mean daily rainfall occurs in August at 3.73 mm/day, making rain preparation especially relevant for plans then. The unweighted mean across monthly means is 2.59 mm/day; these daily averages do not show how often rain falls, guarantee dry days in the lower-rainfall month, or represent monthly totals.
Sunshine
Mean daily sunshine duration is highest in May, at 11.62 hours/day, and lowest in November, at 10.09 hours/day. The unweighted mean across monthly means is 10.88 hours/day. These figures can help with outdoor planning by indicating the average duration of sunshine, but they are not measures of day length and do not guarantee the sunshine available on a particular day.
Best Travel Time Guide for Castries, Saint Lucia: Ideal Seasons and Weather Insights
If lower average rainfall is your priority, consider April as a conditional time to plan, when mean daily rainfall is 1.47 mm/day; this does not guarantee rain-free days, so keep plans flexible. For travel in August, when the mean daily amount is 3.73 mm/day, include rain-ready clothing or other practical wet-weather preparation. For visitors who prefer cooler monthly averages, February is the relevant option, with a monthly mean temperature of 25.0 °C. Sunshine duration is highest in May at 11.62 hours/day and lowest in November at 10.09 hours/day, which may help when planning outdoor sightseeing; these are daily averages, not promises about conditions on a chosen date or measures of daylight length.
Climate Data Overview for Castries, Saint Lucia
Explore the comprehensive climate data for Castries, Saint Lucia. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 25.1 | 1.74 | 0.00 | 10.43 |
| Feb | 25.0 | 1.56 | 0.00 | 10.73 |
| Mar | 25.3 | 1.51 | 0.00 | 11.20 |
| Apr | 26.0 | 1.47 | 0.00 | 11.54 |
| May | 26.6 | 1.71 | 0.00 | 11.62 |
| Jun | 26.8 | 3.07 | 0.00 | 11.30 |
| Jul | 26.8 | 3.56 | 0.00 | 11.43 |
| Aug | 27.1 | 3.73 | 0.00 | 11.11 |
| Sep | 27.4 | 3.70 | 0.00 | 10.77 |
| Oct | 27.0 | 3.49 | 0.00 | 10.23 |
| Nov | 26.3 | 3.61 | 0.00 | 10.09 |
| Dec | 25.8 | 1.91 | 0.00 | 10.12 |
| Average | 26.3 | 2.59 | 0.00 | 10.88 |
