Porto climate

Name: Porto
Address: PT

Porto is warmest in August, with average highs of 26 °C, and coldest in January, when nights average 6.4 °C. December is the wettest month (171 mm) and July the driest (22 mm). Figures are 1991–2020 climate normals.

Across a full year Porto averages 1,261 mm of rain, 55 days above 25 °C and 0 days below freezing.

Portugal · population 252,687 · 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 26 °C
Coldest month January 6.4 °C
Driest month July 22 mm
Wettest month December 171 mm
Least cloud July 33 % cloud
Hottest on record July 38 °C
Coldest on record January -1.1 °C
Warmest sea September 17 °C

What to expectPorto through the year

Porto has a clear annual cycle: average daily highs run from 13 °C in January to 26 °C in August, a swing of 12 °C in mean temperature across the year.

Counted across a normal year, 55 days a year reach 25 °C, 14 of them reach 30 °C, 0 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in July.

Rain is strongly seasonal. December averages 171 mm against 22 mm in July — 7.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Porto is warmest in September at 17 °C and coldest in February at 13 °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	12.9 °C	154 mm	60 %
February	13.9 °C	103 mm	55 %
March	16.3 °C	123 mm	55 %
April	17.5 °C	123 mm	56 %
May	20.0 °C	102 mm	53 %
June	23.0 °C	39 mm	45 %
July	25.3 °C	22 mm	33 %
August	25.9 °C	30 mm	35 %
September	23.9 °C	64 mm	45 %
October	20.1 °C	166 mm	57 %
November	15.7 °C	166 mm	60 %
December	13.6 °C	171 mm	62 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	12.9 °C	6.4 °C	9.3 °C	19.9 °C	-1.1 °C	0	0
February	13.9 °C	6.4 °C	9.8 °C	22.7 °C	-0.8 °C	0	0
March	16.3 °C	8.2 °C	11.9 °C	25.4 °C	-0.8 °C	0	0
April	17.5 °C	9.7 °C	13.5 °C	28.3 °C	3.6 °C	1	0
May	20.0 °C	12.3 °C	16.0 °C	32.0 °C	6.0 °C	4	1
June	23.0 °C	15.0 °C	18.9 °C	35.4 °C	9.1 °C	9	2
July	25.3 °C	16.7 °C	20.8 °C	38.4 °C	12.2 °C	14	4
August	25.9 °C	17.1 °C	21.1 °C	37.6 °C	12.4 °C	15	5
September	23.9 °C	15.7 °C	19.4 °C	35.9 °C	9.0 °C	10	3
October	20.1 °C	13.1 °C	16.3 °C	32.1 °C	5.5 °C	2	0
November	15.7 °C	9.6 °C	12.4 °C	23.2 °C	2.3 °C	0	0
December	13.6 °C	7.5 °C	10.2 °C	19.9 °C	-0.7 °C	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	154 mm	12	9.5 h/day	60 %	83 %	18 km/h	13.6 °C
February	103 mm	10	11 h/day	55 %	80 %	18 km/h	13.2 °C
March	123 mm	10	12 h/day	55 %	77 %	19 km/h	13.6 °C
April	123 mm	12	13 h/day	56 %	77 %	19 km/h	14.4 °C
May	102 mm	11	14 h/day	53 %	77 %	18 km/h	15.5 °C
June	39 mm	6	15 h/day	45 %	75 %	18 km/h	16.7 °C
July	22 mm	4	15 h/day	33 %	74 %	18 km/h	17.1 °C
August	30 mm	4	14 h/day	35 %	73 %	18 km/h	17.3 °C
September	64 mm	6	12 h/day	45 %	76 %	17 km/h	17.4 °C
October	166 mm	12	11 h/day	57 %	80 %	17 km/h	16.6 °C
November	166 mm	13	9.9 h/day	60 %	82 %	18 km/h	15.5 °C
December	171 mm	12	9.2 h/day	62 %	83 %	18 km/h	14.3 °C

Where Porto ranks

Ranking	Position	Value
Places with the best weather in Europe in June	7thof 50	92/100
Places with the best weather in Europe in July	14thof 50	90/100
The warmest places in Europe in February	24thof 50	14 °C
The warmest places in Europe in March	24thof 50	16 °C
The warmest places in Europe in January	25thof 50	13 °C
The warmest places in Europe in December	26thof 50	14 °C

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

QuestionsCommon questions about Porto’s climate

When is the best time to visit Porto?

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

How hot does Porto get?

In August, the warmest month, daily highs average 26 °C. About 14 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average 6.4 °C in January, the coldest month. A normal year has 0 nights below freezing.

Which month is wettest in Porto?

December, averaging 171 mm over 12 days with rain. The driest month is July with 22 mm. The year as a whole averages 1,261 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 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.