Porto Temperature by Month

Porto, Norte Region, Portugal has an average annual maximum temperature of 19°C (66°F), with moderate seasonal shifts ranging from 14°C (57°F) in January to 25°C (77°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Porto, seasonal changes bring about a moderate variation in temperatures. Nighttime lows range from 18°C (64°F) in August to 8°C (46°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Porto by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 295 hours of sunshine.

The chart below shows the average temperature throughout the year:

Porto's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Porto, January is the coolest month, with average highs of 14°C (57°F) and humidity around 81%, considered very high. In August, the warmest month, temperatures average 25°C (77°F) with 73% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Porto this rarely lasts long on the ground.

For more on Porto's weather, including monthly rainfall, sunshine hours, and humidity, visit our Porto climate page.