Jamestown climate

Name: Jamestown
Address: SH

Jamestown is warmest in March, with average highs of 24 °C, and coldest in September, when nights average 19 °C. March is the wettest month (8.1 mm) and November the driest (2.7 mm). Figures are 1991–2020 climate normals.

Across a full year Jamestown averages 59 mm of rain and 2 days above 25 °C.

Saint Helena · 10 m elevation · population 637 · 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 March 24 °C
Coldest month September 19 °C
Driest month November 3 mm
Wettest month March 8 mm
Least cloud February 44 % cloud
Hottest on record March 26 °C
Coldest on record September 17 °C
Warmest sea March 25 °C

What to expectJamestown through the year

Jamestown has a clear annual cycle: average daily highs run from 19 °C in September to 24 °C in March, a swing of 4.7 °C in mean temperature across the year.

Counted across a normal year, 2 days a year reach 25 °C. The warmest reading in the 1991–2020 record is 26 °C, in March.

Rain is spread fairly evenly through the year, from 3 mm in November to 8 mm in March. There is no dry season to aim for.

The sea off Jamestown is warmest in March at 25 °C and coldest in October at 20 °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	22.6 °C	5 mm	46 %
February	23.7 °C	5 mm	44 %
March	24.2 °C	8 mm	45 %
April	23.7 °C	6 mm	50 %
May	22.7 °C	6 mm	54 %
June	21.5 °C	8 mm	59 %
July	20.4 °C	5 mm	63 %
August	19.7 °C	5 mm	70 %
September	19.5 °C	4 mm	73 %
October	19.6 °C	3 mm	72 %
November	20.0 °C	3 mm	63 %
December	21.1 °C	3 mm	53 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C
January	22.6 °C	21.8 °C	22.2 °C	24.9 °C	19.8 °C	0
February	23.7 °C	22.9 °C	23.4 °C	25.4 °C	20.5 °C	0
March	24.2 °C	23.4 °C	23.8 °C	26.0 °C	21.2 °C	1
April	23.7 °C	22.9 °C	23.4 °C	25.2 °C	21.1 °C	0
May	22.7 °C	21.9 °C	22.4 °C	24.3 °C	20.2 °C	0
June	21.5 °C	20.6 °C	21.1 °C	23.1 °C	18.7 °C	0
July	20.4 °C	19.6 °C	20.0 °C	21.9 °C	17.7 °C	0
August	19.7 °C	18.9 °C	19.3 °C	20.9 °C	17.0 °C	0
September	19.5 °C	18.7 °C	19.1 °C	20.7 °C	16.8 °C	0
October	19.6 °C	18.8 °C	19.2 °C	21.1 °C	17.0 °C	0
November	20.0 °C	19.3 °C	19.7 °C	21.4 °C	17.5 °C	0
December	21.1 °C	20.4 °C	20.8 °C	22.8 °C	18.2 °C	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	5 mm	1	13 h/day	46 %	79 %	28 km/h	23.0 °C
February	5 mm	1	13 h/day	44 %	78 %	28 km/h	24.4 °C
March	8 mm	3	12 h/day	45 %	77 %	29 km/h	24.9 °C
April	6 mm	2	12 h/day	50 %	75 %	29 km/h	24.6 °C
May	6 mm	2	11 h/day	54 %	72 %	29 km/h	23.9 °C
June	8 mm	2	11 h/day	59 %	71 %	31 km/h	22.8 °C
July	5 mm	1	11 h/day	63 %	71 %	32 km/h	21.6 °C
August	5 mm	1	12 h/day	70 %	73 %	33 km/h	20.7 °C
September	4 mm	1	12 h/day	73 %	76 %	32 km/h	20.3 °C
October	3 mm	1	12 h/day	72 %	78 %	32 km/h	20.2 °C
November	3 mm	1	13 h/day	63 %	78 %	30 km/h	20.6 °C
December	3 mm	0	13 h/day	53 %	78 %	28 km/h	21.7 °C

Where Jamestown ranks

Ranking	Position	Value
The coolest places in Africa in October	3rd of 50	20 °C
Best beach destinations in Africa in April	5th of 50	93/100
The coolest places in Africa in September	6th of 50	19 °C
Best beach destinations in Africa in March	7th of 50	95/100
Best beach destinations in Africa in February	10th of 50	93/100
The coolest places in Africa in August	15th of 50	20 °C

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

QuestionsCommon questions about Jamestown’s climate

When is the best time to visit Jamestown?

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

How hot does Jamestown get?

In March, the warmest month, daily highs average 24 °C. The highest value in the 1991–2020 record is 26 °C.

How cold does it get in winter?

Nights average 19 °C in September, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Jamestown?

March, averaging 8 mm over 3 days with rain. The driest month is November with 3 mm. The year as a whole averages 59 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 Jamestown 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: -15.925°, -5.718° , 10 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.