Porto climate
Porto (Portugal) has a warm-summer Mediterranean climate (Köppen Csb). The average temperature over the year is 15 °C59 °F, and about 1,009 mm40 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Porto climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1355 | 846 | 1051 | 1375.4 |
| Feb | 1356 | 846 | 1151 | 963.8 |
| Mar | 1559 | 948 | 1254 | 1124.4 |
| Apr | 1762 | 1051 | 1456 | 913.6 |
| May | 1967 | 1254 | 1660 | 612.4 |
| Jun | 2272 | 1558 | 1865 | 321.3 |
| Jul | 2475 | 1660 | 2068 | 130.5 |
| Aug | 2476 | 1661 | 2068 | 220.9 |
| Sep | 2374 | 1560 | 1967 | 491.9 |
| Oct | 2068 | 1457 | 1762 | 1375.4 |
| Nov | 1660 | 1051 | 1356 | 1375.4 |
| Dec | 1456 | 847 | 1152 | 1224.8 |
| Year | 2476 | 846 | 1559 | 1,00940 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 86% | 59% | 1.8 | 9:31 |
| Feb | 83% | 52% | 2.8 | 10:34 |
| Mar | 81% | 55% | 4.0 | 11:49 |
| Apr | 80% | 52% | 5.3 | 13:16 |
| May | 78% | 46% | 6.4 | 14:28 |
| Jun | 76% | 42% | 6.9 | 15:07 |
| Jul | 74% | 31% | 7.1 | 14:51 |
| Aug | 72% | 31% | 6.4 | 13:48 |
| Sep | 73% | 36% | 5.0 | 12:24 |
| Oct | 78% | 50% | 3.2 | 11:01 |
| Nov | 83% | 53% | 2.1 | 9:49 |
| Dec | 85% | 56% | 1.6 | 9:13 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Porto is like
The warmest month is August, with an average high of 24 °C76 °F and a low of 16 °C61 °F. The coldest is January, when highs average 13 °C55 °F and lows 8 °C46 °F. There is a clear seasonal cycle, with 9.8 °C17.7 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,009 mm40 in of precipitation per year. The wettest three-month stretch is November–January, which brings 39% of the annual total. Months with less than 20 mm0.8 in on average: July. The wettest month is January (137 mm5.4 in), the driest is July (13 mm0.5 in).
Relative humidity ranges from 72% in August to 86% in January. The clearest skies (lowest average cloud amount, 31%) are typical of August. Average wind speed near the ground ranges from 6 km/h (4 mph) in September to 9 km/h (6 mph) in December. Daylight lasts from about 9.2 hours in December to 15.1 hours in June.
Best time to visit Porto
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May–September: average highs of 19 °C67 °F to 24 °C76 °F with 13 mm0.5 in to 61 mm2.4 in of precipitation per month.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Porto
- Winter (December–February) — highs 1355 to 14 °C56 °F, lows around 8 °C46 °F, about 119 mm4.7 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Spring (March–May) — highs 1559 to 19 °C67 °F, lows 948 to 12 °C54 °F, about 88 mm3.4 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Summer (June–August) — highs 2272 to 24 °C76 °F, lows 1558 to 16 °C61 °F, about 22 mm0.9 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 1660 to 23 °C74 °F, lows 1051 to 15 °C60 °F, about 108 mm4.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Porto compares
Compared with Vigo, about 121 km to the north, Porto has practically the same average temperature and receives 13% less precipitation (1,009 mm40 in vs 1,164 mm46 in). The difference is largest in July (1.1 °C1.9 °F cooler).
Of the 9 places in Portugal covered by World Climates, Porto is the 7th warmest by annual mean temperature and the 3rd wettest by annual precipitation. See all of them on the Portugal climate page.
Places in other countries with the most similar temperature and rainfall pattern: Vigo (Spain, Csb), A Coruña (Spain, Csb) and Gijón (Spain, Csb).
Nearby places
- Braga 47 km · 15 °C59 °F · 1,035 mm41 in
- Viseu 80 km · 14 °C57 °F · 1,016 mm40 in
- Coimbra 106 km · 17 °C62 °F · 846 mm33 in
- Vigo 121 km · 15 °C59 °F · 1,164 mm46 in
- Ourense 146 km · 15 °C59 °F · 1,144 mm45 in
- Leiria 157 km · 16 °C61 °F · 658 mm26 in
- A Coruña 248 km · 15 °C58 °F · 1,046 mm41 in
- Salamanca 248 km · 13 °C55 °F · 409 mm16 in
Frequently asked questions
What is the warmest month in Porto?
August is the warmest month in Porto, with an average high of 24 °C (76 °F) and an average low of 16 °C (61 °F).
What is the coldest month in Porto?
January is the coldest month, with an average high of 13 °C (55 °F) and an average low of 8 °C (46 °F).
When does it rain the most in Porto?
January is the wettest month with about 137 mm (5.4 in) of precipitation; July is the driest with about 13 mm (0.5 in).
What is the best time to visit Porto?
Judging by long-term averages, the most comfortable months are May–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.