Castries weather in January

Name: Castries
Address: LC

In January, Castries has daytime highs averaging 27 °C, nights around 24 °C, with 12 wet days, and a sea temperature of 27 °C. Figures are 1991–2020 climate normals.

27.0°C Average high
23.5°C Average low
12days Wet days
36mm Rainfall
27.1°C Sea temperature
11h Daylight

Daily temperatures through January

Daily highDaily low Day of month on the horizontal axis. Highs peak at 27.3 °C and lows bottom out at 23.3 °C.

How January develops

Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.

Days	Avg high	Avg low	Chance of rain
1–10 January	27.1 °C	23.7 °C	44 %
11–20 January	27.0 °C	23.5 °C	37 %
21–31 January	27.1 °C	23.4 °C	32 %

Rain is most likely over days 1–10 of January (44 % of days) and least likely over days 21–31 (32 %).

Chance of a wet day (over 1 mm) by date in January. Wettest date over the 30 years: January 5, at 50 %. Single dates are noisy — read the shape, not the spikes.

What to expect

Measure	Typical January	Share of the month
Days above 25 °C	31 of 31	99 %
Days above 30 °C	0 of 31	0 %
Days below 0 °C	0 of 31	0 %
Days with more than 1 mm rain	12 of 31	38 %

Conditions in January

Measure	Average
Mean temperature	25 °C
Record high (1991–2020)	29 °C
Record low (1991–2020)	20 °C
Relative humidity	74 %
Wind speed	25 km/h
Cloud cover	37 %

Where Castries ranks in January

Ranking	Position	Value
The warmest places in North America in January	40thof 50	27 °C

January compared with the months around it

Month	Avg high	Rainfall	Cloud
January	27.0 °C	36 mm	37 %
February	27.4 °C	25 mm	38 %
March	27.9 °C	30 mm	44 %
November	28.0 °C	103 mm	53 %
December	27.5 °C	46 mm	42 %

See all twelve months for Castries

January is the 12th warmest month here.
It is the 3rd driest month of the year.
It ranks 1st for least cloud cover.
Days last about 11 hours from sunrise to sunset.
It rains on 12 of 31 days — 38 % of the month.
Nights are about 3.5 °C cooler than the middle of the day.
The hottest January day on record since 1991 reached 29 °C, 2.1 °C above the usual daytime high.
Beach score: 81 / 100 — see how this is calculated.

Nearby destinations in January

Destination	Avg high	Wet days	Sea
Castries	27 °C	12	27
Fort-de-France	27 °C	18	27
Kingstown	27 °C	11	27
Roseau	26 °C	12	27
Bridgetown	27 °C	10	27
Saint George's	27 °C	12	27
Basse-Terre	27 °C	12	27
Plymouth	26 °C	12	27
Saint John’s	26 °C	10	27

QuestionsJanuary in Castries, answered

How warm is Castries in January?

Daily highs average 27 °C and nights fall to about 24 °C, a spread of 3.5 °C between afternoon and dawn. That makes January the 12th warmest month of the year here.

Does it rain much in Castries in January?

January averages 36 mm of rain, spread over about 12 of the 31 days — 38 % of the month. Cloud cover averages 37 % of the sky.

Is the sea warm enough to swim in January?

The sea averages 27 °C off Castries in January. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.

How long are the days in January?

Castries averages 11 hours between sunrise and sunset in January. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.