Rialto (CA) Sunshine Hours by Month

Sunshine is key to understanding how a place experiences its seasons. This page shows the total number of hours of direct sunlight per month and the average hours per day in Rialto, California, United States of America. This average is based on long-term data collected between 1990 and 2020.

Monthly hours of sunshine

Those who love seasonal contrasts will appreciate Rialto. Expect long, bright days with 369 hours in July and darker periods with just 198 hours in January. The total annual amount of sun is 3279 hours.

Daily hours of sunshine

This means the city can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 12.3 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 6.6 hours of sunlight per day.

Rialto enjoys an average of 3279 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Athens, Greece, enjoys 2769 hours of sunshine each year, making it one of the sunniest destinations in the Mediterranean region.

In contrast, Brussels, Belgium, receives only about 1590 hours of sunshine per year, known for its frequently overcast and rainy skies.

Oslo, Norway, receives approximately 1690 hours of sunshine annually.

In Tokyo, Japan, the average annual sunshine is 1930 hours, with sunny periods between rainy seasons.

December, Rialto’s wettest month, receives 3.9 mm (0.2 in) of rainfall and has a maximum daytime temperature of 18°C (64°F). During the driest month June you can expect a temperature of 31°C (88°F).

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Rialto Precipitation page.