Castel Gandolfo Weather & Climate: Best Time to Visit

Visitors to Castel Gandolfo can expect significant temperature changes throughout the year. Average daytime temperatures reach a very warm 31°C (88°F) in August. In January, the coolest month of the year, temperatures drop to a moderate 13°C (55°F).

At night, temperatures range from around 20°C (68°F) in August to 5°C (41°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Castel Gandolfo is known for its substantial rainfall, with annual precipitation reaching 1015 mm (40 in). Castel Gandolfo can be quite wet during November, receiving approximately 153 mm (6 in) of precipitation over 15 rainy days.

In contrast, during the driest month (July), you will experience much drier conditions, with 27 mm (1.1 in) of precipitation spread across 5 rainy days days. For more details, please visit our Castel Gandolfo Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Castel Gandolfo can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 11.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 3.7 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Castel Gandolfo.

The city experiences its highest humidity in November, reaching 77%. In July, the humidity drops to its lowest level at 72%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year