São João do Estoril Temperature by Month

The average annual maximum temperature in São João do Estoril, Lisbon Region, Portugal is 19°C (66°F), with daytime highs ranging from 16°C (61°F) in January to 23°C (73°F) in August. This page covers monthly averages, day-night differences, and how São João do Estoril compares to cities worldwide.

The weather in São João do Estoril changes moderately throughout the year, offering enough variation to appreciate each season. Nights are cooler, with lows ranging from 18°C (64°F) to 11°C (52°F).

The chart below illustrates the average maximum day and minimum night temperatures in São João do Estoril by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 355 hours of sunshine.

The chart below shows the average temperature throughout the year:

São João do Estoril'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:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 São João do Estoril, January is the coolest month, with average highs of 16°C (61°F) and humidity around 82%, considered very 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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on São João do Estoril's weather, including monthly rainfall, sunshine hours, and humidity, visit our São João do Estoril climate page.