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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Lucia, check out our Castries's climate page.
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
*
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 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 35 years of weather observations (1990-2025), 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 →
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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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Lucia, check out our Castries's climate page.
Temperature Rainfall Sunshine Humidity
See the full Castries climate overview or explore weather in Saint Lucia.
