Arelho Temperature by Month

The average annual maximum temperature in Arelho, Centro Region, Portugal is 20°C (68°F), with daytime highs ranging from 15°C (59°F) in January to 25°C (77°F) in August. This page covers monthly averages, day-night differences, and how Arelho compares to cities worldwide.

Seasonal changes in Arelho bring a little variety without extreme temperature swings. Nighttime lows range from 18°C (64°F) in August to 9°C (48°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Arelho 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 255 hours of sunshine.

The chart below shows the average temperature throughout the year:

Arelho'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:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

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 Arelho, January is the coolest month, with average highs of 15°C (59°F) and humidity around 82%, considered very high. In August, the warmest month, temperatures average 25°C (77°F) with 89% humidity, conditions that feel 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.

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 Arelho this rarely lasts long on the ground.

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