Gustavia climate

Name: Gustavia
Address: BL

Gustavia is warmest in September, with average highs of 28 °C, and coldest in February, when nights average 24 °C. October is the wettest month (129 mm) and March the driest (20 mm). Figures are 1991–2020 climate normals.

Across a full year Gustavia averages 757 mm of rain and 342 days above 25 °C.

Saint Barthelemy · population 5,988 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month September 28 °C
Coldest month February 24 °C
Driest month March 20 mm
Wettest month October 129 mm
Least cloud January 30 % cloud
Hottest on record October 30 °C
Coldest on record January 22 °C
Warmest sea September 29 °C

What to expectGustavia through the year

Gustavia changes little through the year. Average daily highs stay between 25 and 28 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 342 days a year reach 25 °C. The warmest reading in the 1991–2020 record is 30 °C, in October.

Rain is strongly seasonal. October averages 129 mm against 20 mm in March — 6.5 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Gustavia is warmest in September at 29 °C and coldest in February at 26 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	25.6 °C	28 mm	30 %
February	25.4 °C	21 mm	30 %
March	25.4 °C	20 mm	33 %
April	25.9 °C	32 mm	37 %
May	26.8 °C	62 mm	56 %
June	27.5 °C	47 mm	54 %
July	27.8 °C	68 mm	48 %
August	28.1 °C	84 mm	49 %
September	28.1 °C	115 mm	59 %
October	27.8 °C	129 mm	54 %
November	27.1 °C	102 mm	45 %
December	26.3 °C	49 mm	35 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C
January	25.6 °C	24.4 °C	25.0 °C	27.4 °C	21.5 °C	27
February	25.4 °C	24.2 °C	24.8 °C	27.0 °C	21.5 °C	20
March	25.4 °C	24.2 °C	24.8 °C	27.4 °C	22.0 °C	23
April	25.9 °C	24.7 °C	25.3 °C	27.8 °C	22.5 °C	28
May	26.8 °C	25.5 °C	26.2 °C	28.6 °C	23.1 °C	31
June	27.5 °C	26.2 °C	26.9 °C	29.0 °C	24.2 °C	30
July	27.8 °C	26.3 °C	27.2 °C	29.0 °C	24.5 °C	31
August	28.1 °C	26.6 °C	27.4 °C	29.6 °C	24.9 °C	31
September	28.1 °C	26.5 °C	27.4 °C	29.5 °C	24.4 °C	30
October	27.8 °C	26.3 °C	27.2 °C	29.8 °C	24.0 °C	31
November	27.1 °C	25.7 °C	26.5 °C	28.8 °C	23.6 °C	30
December	26.3 °C	25.0 °C	25.7 °C	28.2 °C	22.6 °C	30

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	28 mm	8	11 h/day	30 %	77 %	31 km/h	26.5 °C
February	21 mm	6	12 h/day	30 %	76 %	31 km/h	26.1 °C
March	20 mm	5	12 h/day	33 %	76 %	29 km/h	26.1 °C
April	32 mm	7	13 h/day	37 %	78 %	28 km/h	26.7 °C
May	62 mm	11	13 h/day	56 %	80 %	28 km/h	27.4 °C
June	47 mm	10	13 h/day	54 %	80 %	31 km/h	27.9 °C
July	68 mm	14	13 h/day	48 %	81 %	32 km/h	28.0 °C
August	84 mm	15	13 h/day	49 %	81 %	30 km/h	28.5 °C
September	115 mm	16	12 h/day	59 %	81 %	27 km/h	28.8 °C
October	129 mm	17	12 h/day	54 %	81 %	26 km/h	28.8 °C
November	102 mm	14	11 h/day	45 %	79 %	28 km/h	28.2 °C
December	49 mm	11	11 h/day	35 %	77 %	31 km/h	27.3 °C

How Gustavia compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Gustavia	28 °C	24 °C	757 mm	342
Basseterre · Saint Kitts and Nevis	29 °C	24 °C	807 mm	357
Saint John’s · Antigua and Barbuda	29 °C	24 °C	837 mm	361
Plymouth · Montserrat	29 °C	24 °C	775 mm	361
Road Town · British Virgin Islands	28 °C	24 °C	825 mm	336
Charlotte Amalie · U.S. Virgin Islands	28 °C	24 °C	858 mm	338
Basse-Terre · Guadeloupe	30 °C	24 °C	816 mm	364

Where Gustavia ranks

Ranking	Position	Value
Best beach destinations in the world in March	47thof 50	94/100

Planning a trip? See the best time to visit Gustavia.

QuestionsCommon questions about Gustavia’s climate

When is the best time to visit Gustavia?

That depends on what you want, so the honest answer is a comparison rather than a single month. January, February, March sit closest to 20 °C on average, September is the warmest month and March the driest. The month-by-month table above has the full picture.

How hot does Gustavia get?

In September, the warmest month, daily highs average 28 °C. The highest value in the 1991–2020 record is 30 °C.

How cold does it get in winter?

Nights average 24 °C in February, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Gustavia?

October, averaging 129 mm over 17 days with rain. The driest month is March with 20 mm. The year as a whole averages 757 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Gustavia rather than what any particular week will bring. Individual years can differ substantially from the normal.

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: monthly rankings, daylight hours, beach and comfort scores. 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.