Weather in Rome

The end of July is the warmest period of the year in Rome: it almost never rains, except for some unexpected and very unfrequent afternoon showers. However, the relative closeness of the sea mitigates, at a certain degree, the high temperatures with a gentle breeze. The humidity is quite high, especially in the morning, but in the late afternoon often a mild wind coming from the Castelli Romani (the ring of small towns surrounding Rome on the Western hills), the so-called Ponentino, greatly improves comfort.
A summary of last 10 years weather data at the end of July shows:
Temperature Min 19.5º C (67.1º F)
Max 31º C (87.8º F)
Humidity 82% early in the morning
44% at noon
Rain Almost none
Wind Mild from North and on afternoon
from West (the famed "Ponentino")

More information on weather in Rome can be found at these web sites:

Intellicast Cugel Meteo France
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Web Master: Cecilia Di Chio & Luca Satolli
Hexagon graphical line: Dario-Jacopo Laganà