Carolina climate

Name: Carolina
Address: PR

Carolina is warmest in August, with average highs of 31 °C, and coldest in February, when nights average 21 °C. September is the wettest month (169 mm) and February the driest (40 mm). Figures are 1991–2020 climate normals.

Across a full year Carolina averages 1,200 mm of rain and 364 days above 25 °C.

Puerto Rico · 16 m elevation · population 170,404 · 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 August 31 °C
Coldest month February 21 °C
Driest month February 40 mm
Wettest month September 169 mm
Least cloud February 40 % cloud
Hottest on record July 35 °C
Coldest on record January 17 °C
Warmest sea September 29 °C

What to expectCarolina through the year

Carolina has a clear annual cycle: average daily highs run from 28 °C in February to 31 °C in August, a swing of 3.3 °C in mean temperature across the year.

Counted across a normal year, 364 days a year reach 25 °C, 159 of them reach 30 °C. The warmest reading in the 1991–2020 record is 35 °C, in July.

Rain is strongly seasonal. September averages 169 mm against 40 mm in February — 4.3 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Carolina 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	27.7 °C	51 mm	42 %
February	28.2 °C	40 mm	40 %
March	28.9 °C	55 mm	43 %
April	29.6 °C	87 mm	49 %
May	30.0 °C	140 mm	65 %
June	30.9 °C	95 mm	63 %
July	31.0 °C	106 mm	59 %
August	31.1 °C	124 mm	61 %
September	30.9 °C	169 mm	67 %
October	30.2 °C	151 mm	63 %
November	28.8 °C	124 mm	56 %
December	27.9 °C	60 mm	45 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	27.7 °C	21.6 °C	24.1 °C	31.1 °C	17.1 °C	30	1
February	28.2 °C	21.5 °C	24.3 °C	32.3 °C	17.2 °C	28	2
March	28.9 °C	21.6 °C	24.7 °C	33.0 °C	18.0 °C	31	7
April	29.6 °C	22.3 °C	25.4 °C	33.4 °C	18.9 °C	30	11
May	30.0 °C	23.4 °C	26.2 °C	34.2 °C	19.3 °C	31	16
June	30.9 °C	24.4 °C	27.1 °C	33.9 °C	21.5 °C	30	23
July	31.0 °C	24.6 °C	27.3 °C	34.8 °C	22.1 °C	31	25
August	31.1 °C	24.7 °C	27.4 °C	34.5 °C	22.1 °C	31	27
September	30.9 °C	24.5 °C	27.1 °C	34.3 °C	22.0 °C	30	24
October	30.2 °C	24.0 °C	26.5 °C	34.3 °C	20.6 °C	31	18
November	28.8 °C	23.1 °C	25.4 °C	32.1 °C	19.7 °C	30	4
December	27.9 °C	22.3 °C	24.6 °C	31.5 °C	17.6 °C	31	1

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	51 mm	15	11 h/day	42 %	79 %	16 km/h	26.5 °C
February	40 mm	12	12 h/day	40 %	76 %	17 km/h	26.1 °C
March	55 mm	14	12 h/day	43 %	74 %	16 km/h	26.1 °C
April	87 mm	17	13 h/day	49 %	76 %	15 km/h	26.6 °C
May	140 mm	21	13 h/day	65 %	79 %	15 km/h	27.2 °C
June	95 mm	20	13 h/day	63 %	78 %	17 km/h	27.9 °C
July	106 mm	21	13 h/day	59 %	78 %	18 km/h	28.1 °C
August	124 mm	23	13 h/day	61 %	80 %	16 km/h	28.6 °C
September	169 mm	24	12 h/day	67 %	82 %	14 km/h	28.9 °C
October	151 mm	24	12 h/day	63 %	83 %	13 km/h	28.9 °C
November	124 mm	21	11 h/day	56 %	84 %	14 km/h	28.3 °C
December	60 mm	16	11 h/day	45 %	81 %	16 km/h	27.3 °C

How Carolina 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
Carolina	31 °C	21 °C	1,200 mm	364
San Juan · Puerto Rico	31 °C	21 °C	903 mm	364
Charlotte Amalie · U.S. Virgin Islands	28 °C	24 °C	858 mm	338
Road Town · British Virgin Islands	28 °C	24 °C	825 mm	336
La Romana · Dominican Republic	32 °C	22 °C	673 mm	365
Gustavia · Saint Barthelemy	28 °C	24 °C	757 mm	342
San Pedro de Macorís · Dominican Republic	31 °C	22 °C	737 mm	364

Where Carolina ranks

Ranking	Position	Value
The warmest places in North America in November	23rd of 50	29 °C
The warmest places in North America in October	26th of 50	30 °C
The warmest places in North America in December	32nd of 50	28 °C
The warmest places in North America in January	34th of 50	28 °C
The warmest places in North America in February	38th of 50	28 °C
The warmest places in North America year-round	39th of 50	30 °C

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

QuestionsCommon questions about Carolina’s climate

When is the best time to visit Carolina?

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

How hot does Carolina get?

In August, the warmest month, daily highs average 31 °C. About 159 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.

How cold does it get in winter?

Nights average 21 °C in February, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Carolina?

September, averaging 169 mm over 24 days with rain. The driest month is February with 40 mm. The year as a whole averages 1,200 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 Carolina 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
Data point: 18.381°, -65.957° , 16 m above sea level (the coordinates the reanalysis values are taken for)
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.