Average Monthly Sunshine in Union City (CA)

The graphs on this page shows the average number of hours per month and per day that Union City receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine

Seasonal sunshine in Union City varies. It peaks at 324 hours in May and drops to 160 hours in December. The total annual amount of sun is 3072 hours.

Daily hours of sunshine

In Union City, summer days are longer and more sunny, with daily sunshine hours peaking at 10.8 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.3 hours.

Union City’s total hours of sunshine compared to other major cities

Union City enjoys an average of 3072 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

In Barcelona, Spain, there are 2530 hours of sunshine annually and is a city that can be visited year-round.

In contrast, London, UK, receives only about 1659 hours of sunshine per year, known for its frequently overcast and rainy skies.

In Shanghai, China, the annual average sunshine is 1780 hours, with cloudier weather in summer.

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

Other climate information

December, Union City’s wettest month, receives 3.4 mm of rainfall and has a maximum daytime temperature of 15°C. During the driest month July you can expect a temperature of 25°C.

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