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Castries Weather in August
In Castries, August brings very high daytime temperatures around 31°C (88°F), with nights cooling to 26°C (79°F). Expect quite a bit of rainfall this month.
Rainfall in Castries in August
Looking at the last 30 years, the data shows about 20 days with rain, averaging 114 mm (4.5 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Castries in August
Daytime temperatures in Castries reach 31°C (88°F) in August, dropping to 26°C (79°F) at night. Mornings and evenings are often more comfortable than the peak afternoon hours. At 26°C (79°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Castries in August
Expect sunny days throughout the month, with an estimated 248 hours of sunshine. This makes it a pleasant time to visit Castries.August in Castries has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Castries Temperature in August
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
68%
Precipitation
114 mm (4.5 in)
Rainy days
20 days
Humidity
80% *
Sunshine
248 hours *
Percentage Sunshine
*
* Data from: Saint Lucia, Saint Lucia (4 KM, 2 Miles).
Castries Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castries - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Castries typically stay consistent throughout August, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in August
Historical weather records for Castries in August
Browse day-by-day weather records for Castries spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Castries historical weather extremes in August
Based on 36 years of weather observations (1990-2026), these are the most extreme conditions recorded in Castries.
- Castries recorded its highest August temperature of 36°C (97°F) on August 29, 2020.
- The lowest daytime temperature in August was 27°C (81°F), recorded on August 14, 1993.
- The lowest overnight temperature recorded in August was 20°C (68°F) (August 30, 2016).
Best Places in Saint Lucia in August
Find out more about the weather in Saint Lucia and which places have the best travel conditions in this month. See all of Saint Lucia in August →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Castries in August
Warm but pleasant conditions in Castries in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Castries in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Castries 3-Day Forecast
More climate data for Castries
Temperature Rainfall Sunshine Humidity
See the full Castries climate overview or explore weather in Saint Lucia.
Popular in August
Where to go in August - average daytime high across popular destinations.
Castries
31°C (88°F) Marigot Bay31°C (88°F) Laborie
30°C (86°F) Rodney Bay Village30°C (86°F) Cap Estate30°C (86°F) Soufrière31°C (88°F) Gros Islet30°C (86°F) Vieux Fort30°C (86°F) Bucket list
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