Castries (Saint Lucia) weather in July

July in Castries: sweltering, rainy, with muggy air — fine if you can take 23 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Castries🇱🇨 Saint Lucia · Lesser Antilles · Island85
  1. 90Jan
  2. 91Feb
  3. 92Mar
  4. 91Apr
  5. 90May
  6. 87Jun
  7. 85Jul
  8. 84Aug
  9. 83Sep
  10. 83Oct
  11. 84Nov
  12. 90Dec

#8 of 12 months in Castries · #472 of 1413 destinations to visit in July · comfort 85/100 (tier A)

Days
31°C
Nights
25°C
Wet days
23
Sun
11.4 h
Humidity
78%
Daylight
13 h
Castries, Saint Lucia
Photo: Katie Schankula · Pexels

Traveller notes on Castries in July

Other months in Castries

Regulars are specific this counts as peak season here, calm seas and minimal seaweed the norm, any rain typically arriving in short bursts lasting a few hours at most rather than settling in for a full day. Our row backs that hot, genuinely wet read, 29.1C reading as a hot 31C, over 23C nights feeling 25C, with 41.8mm of rain spread across 14.3 days and humidity at 75 percent. Regulars are consistent a beautiful, sunny, breezy stretch in the mid-80s Fahrenheit is a common report even in the technically coolest month for locals. Genuinely excellent conditions overall make this one of the most popular windows to visit. The sea sits at a bath-warm 27.9C. The record: 10.2 hours of sun, a 23.9 kph wind and AQI 39.
PeakSeasonRainInShortBurstsOnly · December · 1 month ago · Read more on Tripadvisor ↗
May is the last month of the dry season here, which runs December through May, and regulars call the handover to the wet months an unremarkable one - the same hot days and nights with occasional showers, storms that come in fast and leave just as quickly. Our row backs that: 37.3mm across 11.4 days is a real but modest total. Air is 30.5C reading as 33C, though at 72.4 percent humidity it is milder than the number implies, and they credit the constant wind off the ocean, which our column carries at a genuine 24.1 kph. Nights hold 24.9C, the sea 28C. Prices ease and booking gets easier as the dry season's crowds thin out. The record: 11.7 hours of sun and AQI 48.
TheHandoverIsUnremarkable · May · 1 month ago · Read more on Tripadvisor ↗
January sits in the dry season, January to March, which is also the expensive one. Regulars describe the rain rather than denying it: quick bursts of five or ten minutes, more often at night than by day, and a full day of rain rare enough to be remembered. That is exactly our row - 34.7mm spread over 14.6 precipitation days is under two and a half millimetres each. They add a geography to it: through these months the rain falls more on the interior than the coasts, and it can be pouring in one part of the island while another is bone dry. Days run to 28.4C with an easterly breeze our row measures at 24.3 kph. The record: 22.3C nights, 10.5 hours of sun and a 26.9C sea.
FiveOrTenMinutesMostlyAtNight · January · 1 month ago · Read more on Tripadvisor ↗
February, March and April are the driest months here and April is both the hottest and still high season - regulars describe good breezes, plenty of hot sun, middling humidity and some passing showers. Our row's 12.4 precipitation days spread just 34.2mm between them, under three millimetres a day, which is exactly what a passing shower measures. The trade winds at 22.8 kph are why 30C reads as only 32C. On sargassum they give a rule rather than a forecast: April is usually a low month for it, and the west coast is rarely affected at all, so a west-coast base removes most of the risk whatever the season does. The record: 23.9C nights, humidity 71 percent, 11.5 hours of sun, a 27.2C sea and AQI 46.
PickTheWestCoast · April · 1 month ago · Read more on Tripadvisor ↗

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Castries climate normals — July

Daytime high31°C / 87°F🔥 sweltering
Nighttime low25°C / 76°F
Feels like (high)34°C / 93°F
Sea temperature29°C / 84°F♨️ bath-warm
Rainfall92 mm / 3.6 in🌧 rainy
Rainy days23 days
Humidity78%💦 very humid
Dew point24°C / 75°F
Sunshine11.4 h/day
Daylight12.9 h
Wind25 km/h / 15 mph
Air quality (US AQI)58🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Castries in July

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusySaint Lucia Carnival, school holidays in 3 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Castries's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherCastries's weather doesn't swing hard through the year — comfort stays fairly steady in every month.

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What's on in Castries in July

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    Sargassum on the Atlantic side

    1 Apr – 30 Sep · usuallySargassum season

    The windward coast around Vieux Fort and Micoud takes the weed and the smell that comes with it. The Caribbean side, from Castries down to Soufriere, is largely spared.

  • Hazard

    Hurricane season

    1 Jun – 30 Nov

    Far enough south to be missed most years, but Tomas arrived at the end of October 2010 and took the roads and the water supply with it. August to early October is the stretch that matters. Source ↗

  • Festival

    Saint Lucia Carnival

    1–22 JulCrowdedBook early

    Saint Lucia moved its carnival off Lent and into July. J'ouvert starts before dawn in paint and oil, then two days of Parade of the Bands close Castries in the third week of the month. Source ↗

What's on around the world in July →

Nearby, and something's on

Within 300 km of Castries — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Castries?

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Castries in July — FAQ

Is July a good time to visit Castries?
July in Castries: sweltering, rainy, with muggy air — fine if you can take 23 rainy days. It ranks #8 of 12 months for Castries on SeasonMap's comfort score (85/100).
What is the weather like in Castries in July?
In July, Castries averages a daily high of 30.5°C and a low of 24.7°C, with about 92.4 mm of rain over roughly 22.5 rainy days.
What is the air quality in Castries in July?
Castries has a mean US Air Quality Index of about 58 in July.

Within 300 km: Fort-de-France's Tour des Yoles Rondes on 26 Jul – 2 Aug, and Bridgetown's Hawksbill nesting around 1 May – 31 Oct.