Arcos Temperature by Month
Arcos in Norte Region, Portugal sees significant seasonal temperature differences, with daytime highs between 14°C (57°F) in January and 26°C (79°F) in August, averaging 20°C (68°F) annually. Explore the full monthly breakdown below.
Arcos Monthly Temperatures
In Arcos, temperatures can shift dramatically between warm in summer and mild in winter. Nights follow the same pattern, with lows ranging from 17°C (63°F) in August to 7°C (45°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Arcos by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. August, the warmest month, averages 295 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Arcos vs Portugal
The map below shows the annual temperature across Portugal. You can also select individual months if you want to compare a specific time of year.
very warm
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moderate
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Arcos vs World: Temperature Compared
Arcos's average annual maximum temperature is 20°C (68°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.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Arcos?
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 Arcos, 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 26°C (79°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.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Arcos's weather — including monthly rainfall, sunshine hours, and humidity — visit our Arcos climate page.
