Saint Lucia (Castries) weather in July
Temperature, sea and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Good
Best time to visit: December – July
What is the weather like in Saint Lucia (Castries) in July?
In July, Saint Lucia (Castries) is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. It is the rainy season: rain falls on about 21 days, totalling 91 mm. The air is often humid and muggy. All in all, July is a good month for a holiday in Saint Lucia (Castries).
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 12 h 53 min05:43 – 18:36
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 25 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Time zone
- UTC−4America/St_Lucia
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %93 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in July
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Saint Lucia (Castries) in July: quick answers
Is Saint Lucia (Castries) hot in July?
Yes. In July, Saint Lucia (Castries) is hot: daytime highs average 29 °C and nights stay around 25 °C.
Can you swim in Saint Lucia (Castries) in July?
Yes. In July the sea averages 28.2 °C – lovely and warm for swimming.
Does it rain much in Saint Lucia (Castries) in July?
It rains often – on about 21 days, adding up to 91 mm.
Saint Lucia (Castries) month by month
The whole year in Saint Lucia (Castries)All destinations: Saint LuciaCaribbean weather in JulyWhere to go in JulySea temperature in July
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences