Riachos, in Santarem, Portugal, is home to roughly 5,500 people in the Europe/Lisbon time zone at 39.4°N latitude.
In 2025, Riachos recorded an average annual temperature of 63°F. The hottest temperatures reached 107°F in June; the coolest were 30°F in January. Total precipitation for the year was 39 inches, with the wettest month being January.
View current conditions and forecast for Riachos · More cities in Santarem