Castries Weather by Month
Twelve months of Castries, Saint Lucia weather — averages from 2006–2025.
Castries's warmest month is September (average high 29.7°C (85.5°F)) and the coolest is January (27.1°C (80.8°F)). The most rain falls in October (about 117 mm), and February is the driest (about 37 mm). April is the sunniest, with about 11.8 hours of sunshine a day.
Best months to visit Castries
Ranked within Castries's own year by temperature comfort, rainy days and sunshine — historical averages, not a forecast.
Castries month by month
January
GoodHigh 27.1°C (80.8°F)
Low 23.2°C (73.8°F)
- Rainfall
- 47 mm (1.8 in)
- Rainy days
- 15 rainy days
- Sunshine
- 10.8 h sunshine / day
February
GoodHigh 27.4°C (81.3°F)
Low 23°C (73.4°F)
- Rainfall
- 37 mm (1.5 in)
- Rainy days
- 11 rainy days
- Sunshine
- 11.1 h sunshine / day
March
GoodHigh 28°C (82.4°F)
Low 23.2°C (73.8°F)
- Rainfall
- 39 mm (1.5 in)
- Rainy days
- 13 rainy days
- Sunshine
- 11.6 h sunshine / day
April
GoodHigh 28.7°C (83.7°F)
Low 23.8°C (74.8°F)
- Rainfall
- 46 mm (1.8 in)
- Rainy days
- 13 rainy days
- Sunshine
- 11.8 h sunshine / day
May
GoodHigh 29.3°C (84.7°F)
Low 24.6°C (76.3°F)
- Rainfall
- 54 mm (2.1 in)
- Rainy days
- 15 rainy days
- Sunshine
- 11.6 h sunshine / day
June
FairHigh 29.2°C (84.6°F)
Low 24.8°C (76.6°F)
- Rainfall
- 77 mm (3 in)
- Rainy days
- 18 rainy days
- Sunshine
- 11.5 h sunshine / day
July
FairHigh 28.9°C (84°F)
Low 24.7°C (76.5°F)
- Rainfall
- 106 mm (4.2 in)
- Rainy days
- 22 rainy days
- Sunshine
- 11.5 h sunshine / day
August
FairHigh 29.2°C (84.6°F)
Low 24.8°C (76.6°F)
- Rainfall
- 117 mm (4.6 in)
- Rainy days
- 23 rainy days
- Sunshine
- 11.3 h sunshine / day
September
FairHigh 29.7°C (85.5°F)
Low 25°C (77°F)
- Rainfall
- 106 mm (4.2 in)
- Rainy days
- 20 rainy days
- Sunshine
- 11.1 h sunshine / day
October
FairHigh 29.1°C (84.4°F)
Low 24.9°C (76.8°F)
- Rainfall
- 117 mm (4.6 in)
- Rainy days
- 21 rainy days
- Sunshine
- 10.7 h sunshine / day
November
FairHigh 28.3°C (82.9°F)
Low 24.3°C (75.7°F)
- Rainfall
- 94 mm (3.7 in)
- Rainy days
- 19 rainy days
- Sunshine
- 10.6 h sunshine / day
December
GoodHigh 27.7°C (81.9°F)
Low 23.7°C (74.7°F)
- Rainfall
- 51 mm (2 in)
- Rainy days
- 15 rainy days
- Sunshine
- 10.7 h sunshine / day
Castries Climate & Weather Guide
Temperature, rainfall and sunshine through the year — 2006–2025 averages.
29.7°C (85.5°F)
Hottest month avg high
27.1°C (80.8°F)
Coolest month avg high
117mm
Wettest month avg
37mm
Driest month avg
Temperature by Month
Rainfall by Month
Sunshine Hours
Monthly Averages
| Month | Avg High | Avg Low | Rainfall | Rainy Days | Sunshine |
|---|---|---|---|---|---|
| Jan | 27.1°C (80.8°F) | 23.2°C (73.8°F) | 46.7mm | 15 | 10.8h |
| Feb | 27.4°C (81.3°F) | 23°C (73.4°F) | 37.1mm | 11 | 11.1h |
| Mar | 28°C (82.4°F) | 23.2°C (73.8°F) | 39mm | 13 | 11.6h |
| Apr | 28.7°C (83.7°F) | 23.8°C (74.8°F) | 46mm | 13 | 11.8h |
| May | 29.3°C (84.7°F) | 24.6°C (76.3°F) | 54.1mm | 15 | 11.6h |
| Jun | 29.2°C (84.6°F) | 24.8°C (76.6°F) | 77mm | 18 | 11.5h |
What to Pack
Suggested packing for Castries's climate.
Versatile Layers
Light layers that work for both mild afternoons and cooler evenings.
Rain Protection
A compact umbrella and a light rain jacket for the wettest months.
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Use our Trip PlannerBased on 20 years of historical weather data (2006–2025) from Open-Meteo. Monthly averages, not a forecast.