Union City Weather in October

What's the weather like in Union City (California) in October 2025?

The climate in Union City during October can be summarized as mild and dry.

October is in the fall / autumn in Union City and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (74°F), whilst at night 11°C (51°F) is normal.

Union City weather averages (imperial / metric)
Daytime temperature 23.1°C 73.5°F
Nightly temperature 10.8°C 51.4°F
Average temperature 16.9°C 62.4°F
Daily sunshine 9.1 hrs
Avg rainfall 22 mm 0.9 ins
Rainy days 4 days
Sea temperature 14.2°C 57.6°F
Humidity 69%
Windspeed 13.7kph 9 mph

On average October is the 6th driest month of the year in Union City with around 22mm 0.9 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.1 hours of sunshine per day.

October temperatures in Union City

Union City average temperature in October

October rainfall

Union City average rain in October

October hourly sunshine

Union City average rain in October

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Union City in October 2025.

Other monthly averages

Best places to visit in October

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Union City weather stats

Union City weather statistics
Hottest month: August 25.5°C 77.9°F
Driest month: July 1mm 0ins
Sunniest month: April 11.2hrs
Coldest month: January 13.6°C 56.5°F
Wettest month: January 80mm 3.1ins
Map showing location of Union City (37.59583, -122.01917) Union City map pin © Google

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