Castries weather

Our guide to the weather in Castries during August

30

Average high

6

UV Index

160mm

Monthly rainfall

75%

Humidity

We've looked at the most up-to-date weather data for Castries, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Castries weather in August.

How warm is it in Castries during August?

The temperature is extremely stable in August with average highs of 30℃ and lows just 3℃ lower at 27℃. Of course, the high humidity will make it feel even hotter. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.

Does it rain in Castries during August?

August is typically the wettest month in Castries. On average, there will be 7 rainy days during the month, amounting to 160.2mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. Due to the high temperature and humidity, you might expect lots of thunderstorms, however they're actually fairly infrequent at this time of year. On average, August will see just 3 days that produce a storm.

Is it windy in Castries during August?

You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during August. The high humidity and warm temperature will make the breeze feel warm, so any cooling effect will be limted.

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Weather in Castries

Our month-by-month guide to the weather and climate in Castries

27.5

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January
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February
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March
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April
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May
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June
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July
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August
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September
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October
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November
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December