The Faro–Santarém stretch crosses open, exposed farmland and long tracks with limited shade, where heat rather than storms is usually the main constraint. January and February typically bring cool air and a changeable mix, aligning with the open character of the route. Through the year, winter offers clearer air with passing showers, spring brings frequent rain-and-sun sequences and greening fields, summer amplifies heat across wide plains with little shade, and autumn transitions toward cooler conditions, mixing bright spells with wetter periods and occasionally slick rural tracks.