Union City (CA) Weather and Climate: A Comprehensive Guide
Temperatures in Union City experience a moderate degree of variance through the seasons.
Days can be warm, while the cooler months tend
to be mild.
It typically sees modest rainfall throughout the year.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
The climate in Union City experiences moderate temperature changes, with mild shifts between seasons. Typically, average maximum daytime temperatures range from a comfortable 25°C in September to a moderate 15°C in the coolest month, December.
Nights are cooler, with lows often dropping to around 6°C during the colder months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Union City has a relatively dry climate with low precipitation, averaging 354 mm of rainfall annually. The climate in Union City shows significant variation throughout the year. Expect moderate rainfall in December, with an average of 81 mm of precipitation over 11 rainy days. In contrast, July offers drier and sunnier days, with around 0 mm of rainfall over 0 rainy days. For more details, please visit our Union City Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
For those who appreciate different seasons, Union City serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 10.8 hours of sunshine daily, and embrace the darker days in December, offering only 5.3 hours of daily sunlight. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in Union City.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
broken clouds and rain broken clouds and no rain partly cloudy and rainForecast for Union City (CA)
4 m/s
3 m/s
5 m/s
The best time of year to visit Union City in the United States of America
During the months of May, June, July, August, September and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Yes, the months of May, June, July, August, September and October are very dry.
September has an average maximum temperature of 25°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 15°C.
December tops the wettest month list with 81 mm of rainfall.
July is the driest month with 0 mm of precipitation.
May is the sunniest month with an average of 324 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
