However, the jury is still out on many of these issues, as there is a lack of comprehensive studies. According to data collected by NCSL : -Twenty-one states currently have school districts (with public schools) operating on a four-day week.
In the capital Lisbon average temperatures range from 8 degrees Centigrade in January to 29 degrees Centigrade in July. But it is not unusual to get temperatures well over 30 degrees Centigrade in some summers particularly at the holiday resort of Faro in far south of Portugal.
Weather Lowdown. September sees the weather in Lisbon remain extremely warm. The average temperature still reaches a high of 26Â°C (that's about 79Â°F), and never dips any lower than 17Â°C (about 63Â°F). You will see several days, at least four, with temperatures above 32Â°C. The daily average will never drop below 21Â°C.