Mértola Temperature by Month
The average annual maximum temperature in Mértola, Alentejo, Portugal is 24°C (75°F), with daytime highs ranging from 16°C (61°F) in January to 34°C (93°F) in July. This page covers monthly averages, day-night differences, and how Mértola compares to cities worldwide.
Mértola Monthly Temperatures
Visitors to Mértola can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 18°C (64°F) in July to 6°C (43°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Mértola by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. July, the warmest month, gets 370 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Mértola 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
warm
pleasant
moderate
cold
very cold
Mértola vs World: Temperature Compared
Mértola's average annual maximum temperature is 24°C (75°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.
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 Mértola?
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 Mértola, January is the coolest month, with average highs of 16°C (61°F) and humidity around 81% — considered very high. In July, the warmest month, temperatures average 34°C (93°F) with 50% humidity — conditions that feel moderate. 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 Mértola this rarely lasts long on the ground.
For more on Mértola's weather — including monthly rainfall, sunshine hours, and humidity — visit our Mértola climate page.
