Porto-Novo climate

Name: Porto-Novo
Address: BJ

Porto-Novo is warmest in February, with average highs of 31 °C, and coldest in August, when nights average 23 °C. June is the wettest month (223 mm) and January the driest (30 mm). Figures are 1991–2020 climate normals.

Across a full year Porto-Novo averages 1,274 mm of rain and 362 days above 25 °C.

Benin · population 264,320 · 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 February 31 °C
Coldest month August 23 °C
Driest month January 30 mm
Wettest month June 223 mm
Least cloud December 39 % cloud
Hottest on record February 37 °C
Coldest on record January 17 °C
Warmest sea May 29 °C

What to expectPorto-Novo through the year

Porto-Novo has a clear annual cycle: average daily highs run from 27 °C in August to 31 °C in February, a swing of 3.4 °C in mean temperature across the year.

Counted across a normal year, 362 days a year reach 25 °C, 149 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in February.

Rain is strongly seasonal. June averages 223 mm against 30 mm in January — 7.6 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Porto-Novo is warmest in May at 29 °C and coldest in August at 25 °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	31.1 °C	30 mm	48 %
February	31.4 °C	41 mm	57 %
March	31.1 °C	74 mm	68 %
April	30.7 °C	98 mm	74 %
May	29.7 °C	171 mm	80 %
June	28.1 °C	223 mm	81 %
July	27.1 °C	144 mm	81 %
August	26.9 °C	93 mm	80 %
September	27.6 °C	142 mm	80 %
October	28.7 °C	149 mm	73 %
November	29.8 °C	75 mm	52 %
December	30.7 °C	35 mm	39 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	31.1 °C	24.3 °C	27.0 °C	36.0 °C	16.9 °C	31	24
February	31.4 °C	25.4 °C	27.7 °C	37.2 °C	19.9 °C	28	25
March	31.1 °C	26.0 °C	28.0 °C	34.7 °C	20.3 °C	31	27
April	30.7 °C	25.9 °C	27.8 °C	34.5 °C	23.5 °C	30	23
May	29.7 °C	25.2 °C	27.1 °C	34.5 °C	23.1 °C	31	12
June	28.1 °C	24.1 °C	25.8 °C	32.0 °C	22.4 °C	30	1
July	27.1 °C	23.4 °C	24.9 °C	29.9 °C	22.0 °C	30	0
August	26.9 °C	23.1 °C	24.6 °C	30.3 °C	21.3 °C	30	0
September	27.6 °C	23.5 °C	25.1 °C	33.2 °C	22.1 °C	30	0
October	28.7 °C	24.0 °C	25.9 °C	32.5 °C	22.3 °C	31	2
November	29.8 °C	24.8 °C	26.8 °C	34.3 °C	21.2 °C	30	12
December	30.7 °C	24.6 °C	27.1 °C	35.6 °C	19.7 °C	31	22

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	30 mm	8	12 h/day	48 %	78 %	15 km/h	27.7 °C
February	41 mm	10	12 h/day	57 %	80 %	17 km/h	28.2 °C
March	74 mm	17	12 h/day	68 %	81 %	17 km/h	28.7 °C
April	98 mm	19	12 h/day	74 %	82 %	16 km/h	28.9 °C
May	171 mm	25	12 h/day	80 %	84 %	15 km/h	29.0 °C
June	223 mm	27	13 h/day	81 %	86 %	15 km/h	27.8 °C
July	144 mm	21	12 h/day	81 %	85 %	17 km/h	25.8 °C
August	93 mm	16	12 h/day	80 %	85 %	17 km/h	24.9 °C
September	142 mm	22	12 h/day	80 %	86 %	16 km/h	26.0 °C
October	149 mm	25	12 h/day	73 %	86 %	13 km/h	27.4 °C
November	75 mm	18	12 h/day	52 %	84 %	13 km/h	28.6 °C
December	35 mm	9	12 h/day	39 %	81 %	14 km/h	28.4 °C

How Porto-Novo 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
Porto-Novo	31 °C	23 °C	1,274 mm	362
Cotonou · Benin	30 °C	24 °C	1,263 mm	363
Abomey-Calavi · Benin	30 °C	23 °C	1,210 mm	362
Ota · Nigeria	33 °C	22 °C	1,642 mm	361
Ajegunle · Nigeria	31 °C	24 °C	1,515 mm	362
Agege · Nigeria	32 °C	23 °C	1,497 mm	362
Lagos · Nigeria	31 °C	24 °C	1,589 mm	362

Where Porto-Novo ranks

Ranking	Position	Value
Warmest sea temperatures in Africa in May	12th of 50	29 °C
Warmest sea temperatures in Africa in November	14th of 50	29 °C
Warmest sea temperatures in Africa in June	16th of 50	28 °C
Warmest sea temperatures in Africa in December	19th of 50	28 °C
Warmest sea temperatures in Africa year-round	19th of 50	28 °C
Warmest sea temperatures in Africa in April	21st of 50	29 °C

Planning a trip? See the best time to visit Porto-Novo.

QuestionsCommon questions about Porto-Novo’s climate

When is the best time to visit Porto-Novo?

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

How hot does Porto-Novo get?

In February, the warmest month, daily highs average 31 °C. About 149 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 23 °C in August, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Porto-Novo?

June, averaging 223 mm over 27 days with rain. The driest month is January with 30 mm. The year as a whole averages 1,274 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 Porto-Novo 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: 6.496°, 2.604° (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.