Castries climate — normals and trends
Castries (Saint Lucia) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.3 °C and it receives 864 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is September (27.1 °C on average) and the coldest is January (25.2 °C). Rainfall peaks in October.
Castries averages 0 frost days, 41 hot days (≥ 30 °C) and 218 rainy days per year.
Castries has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The hottest day of the period reached 32.6 °C (on 10 September 2023) and the coldest 19.9 °C (on 7 January 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
CastriesCastries
- coords
- 14.00°, -61.01°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.3°C
Average daily high
28.5°C
Average daily low
24.5°C
Annual rainfall
864mm
Sunshine / day
11.2h
Mean relative humidity
77%
Average peak wind
23.6km/h
Seasonal range
1.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
41 d/yr
Rainy days (≥ 1 mm)
218 d/yr
Annual snowfall
0.0 cm
Average feels-like high
31.3 °C
Average feels-like low
26.5 °C
Average peak gust
44.5 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
21.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.67 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
32.6 °C
10 September 2023
Coldest day
19.9 °C
7 January 1950
Wettest day
156 mm
30 October 2010
Windiest day
62.5 km/h
30 October 2010
Strongest gust
111.6 km/h
30 October 2010
Hottest feels-like
40.1 °C
3 September 2011
Coldest feels-like
18.3 °C
6 January 1950
Sunniest day
12.4 h
8 July 1943
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 28.1 °C | +0.6 °C | 61 mm | +24 mm |
| Feb | 27.6 °C | 0.0 °C | 61 mm | +30 mm |
| Mar | 28.7 °C | +0.7 °C | 39 mm | +9 mm |
| Apr | 28.7 °C | +0.2 °C | 59 mm | +17 mm |
| May | 29.2 °C | +0.1 °C | 82 mm | +25 mm |
| Jun | 29.2 °C | +0.2 °C | 61 mm | -20 mm |
| Jul | 29.6 °C | +0.6 °C | 79 mm | -17 mm |
| Aug | 30.5 °C | +1.3 °C | 77 mm | -35 mm |
| Sep | 30.6 °C | +1.2 °C | 81 mm | -28 mm |
| Oct | 29.9 °C | +0.9 °C | 140 mm | +22 mm |
| Nov | 29.0 °C | +0.6 °C | 64 mm | -38 mm |
| Dec | 28.3 °C | +0.4 °C | 57 mm | +6 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Castries?
Castries has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.3 °C and it receives 864 mm of precipitation per year.
What is the hottest day ever recorded in Castries?
The hottest day measured in Castries between 1940 and 2025 was 10 September 2023, reaching 32.6 °C.
What is the coldest day in Castries?
The coldest day measured in Castries between 1940 and 2025 was 7 January 1950, at 19.9 °C.
Does it snow in Castries?
Almost never: Castries sees virtually no snow, with about 0 frost days per year.
Has the climate of Castries warmed?
Yes: Castries warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castries?
The wettest day measured in Castries between 1940 and 2025 was 30 October 2010, with 156 mm of rain in 24 hours.
What was the windiest day in Castries?
The windiest day measured in Castries between 1940 and 2025 was 30 October 2010, with winds reaching 62.5 km/h.
What is the warmest month in Castries?
The warmest month in Castries is September (27.1 °C on average); the coldest is January (25.2 °C).
How much does it rain in Castries?
Castries receives on average 864 mm of precipitation per year, spread over about 218 rainy days.
Is it sunny in Castries?
Castries gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
Are there tropical nights in Castries?
Yes: Castries has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castries?
In Castries, between 1940 and 2025, the highest apparent temperature reached 40.1 °C on 3 September 2011, and the lowest was 18.3 °C on 6 January 1950.
Compare Castries with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castries