Castries, Saint Lucia Weather
Castries hourly forecast: next 24 hours
Today's high of 85°F (30°C) is right in line with the typical August high of 85°F (29°C).
Current conditions in detail
Castries weather tomorrow (Friday, August 7)
Tomorrow in Castries looks patchy rain nearby, with a high of 85° and an overnight low of 80°. There is a 40% chance of rain - plan accordingly. Winds top out near 17 mph, and the UV index reaches 11 (extreme).
Castries 14-day forecast
About the weather in Castries
Located in Saint Lucia, Castries experiences a tropical wet-and-dry climate with year-round warmth split between a rainy season and a pronounced dry season. Afternoon temperatures peak near 86°F (30°C) in September and dip to about 81°F (27°C) in January, with around 36.2 inches (920 mm) of precipitation falling across the year.
Castries weather: quick facts
- Hottest month: September - highs near 86°F (30°C)
- Coldest month: January - highs near 81°F (27°C)
- Record high: 91°F (33°C) · Record low: 67°F (19°C) (2015–2024)
- Wettest month: July (24 rainy days) · Sunniest: April (11.8 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on September. Highs average 86°F (30°C) and overnight lows stay near 77°F (25°C). The coolest month is January, with typical highs of 81°F (27°C) and lows around 73°F (23°C). Based on 2015–2024 weather data, temperatures have reached as high as 91°F (33°C) and dropped as low as 67°F (19°C).
Rain, sun and snow
July is usually the wettest month. It brings about 4.6 inches (116 mm) of rain over 24 days, while April is the driest. April brings the most sunshine, averaging 11.8 hours of sun a day.
Season by season
March through May
March through May in Castries runs hot, with daytime highs averaging 84°F (29°C) and nights around 74°F (24°C); expect showers on roughly 40 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
June through August
June through August in Castries is hot, with daytime highs averaging 84°F (29°C) and nights around 76°F (25°C); expect showers on roughly 66 days across the season.
September through November
September through November in Castries brings hot afternoons, with daytime highs averaging 85°F (29°C) and nights around 76°F (25°C); expect showers on roughly 63 days across the season.
December through February
December through February in Castries brings hot afternoons, with daytime highs averaging 81°F (27°C) and nights around 73°F (23°C); expect showers on roughly 47 days across the season.
Average temperatures in Castries by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 81° | 73° | 18 | 2.2 in | 10.8 h/day | 76% |
| February | 81° | 73° | 13 | 1.8 in | 11.1 h/day | 74% |
| March | 82° | 73° | 15 | 1.9 in | 11.6 h/day | 74% |
| April | 84° | 74° | 12 | 1.5 in | 11.8 h/day | 73% |
| May | 85° | 76° | 13 | 1.9 in | 11.7 h/day | 74% |
| June | 85° | 76° | 19 | 3.3 in | 11.3 h/day | 77% |
| July | 84° | 76° | 24 | 4.6 in | 11.5 h/day | 80% |
| August | 85° | 76° | 23 | 4.2 in | 11.3 h/day | 80% |
| September | 86° | 77° | 22 | 4.5 in | 11.2 h/day | 80% |
| October | 85° | 76° | 21 | 3.9 in | 10.8 h/day | 80% |
| November | 83° | 75° | 21 | 4.4 in | 10.5 h/day | 80% |
| December | 82° | 74° | 17 | 2.2 in | 10.7 h/day | 77% |