Live Weather & Forecast
Weather in Union City
California, United States · Real-time conditions & 3-day outlook
12°C
Feels like 12°C
53°F / Feels 53°F
Overcast
Union City, California
🌙 Nighttime
Updated: 2026-04-13 01:00
Humidity
89%
Wind
4.3 km/h SSE
Wind Gust
7.6 km/h
Pressure
1018 mb
Visibility
16 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
100%
Dew Point
7.8°C
Wind Degree
163°
Air Quality Index
US EPA: Good
UK DEFRA: Low (2)
CO
195.9 μg/m³
NO₂
31 μg/m³
O₃
13 μg/m³
SO₂
4.4 μg/m³
PM 2.5
14.8 μg/m³
PM 10
16.3 μg/m³
Today's Hourly Forecast
24-hour breakdown for Union City, California
12 AM
10°
Clear
1 AM
12°
Overcast
2 AM
10°
Cloudy
3 AM
10°
Cloudy
4 AM
10°
Partly Cloudy
5 AM
9°
Clear
6 AM
9°
Clear
7 AM
10°
Sunny
8 AM
11°
Sunny
9 AM
12°
Sunny
10 AM
13°
Sunny
11 AM
14°
Partly Cloudy
12 PM
15°
Partly Cloudy
1 PM
16°
Partly Cloudy
2 PM
16°
Partly Cloudy
3 PM
16°
Partly Cloudy
4 PM
17°
Sunny
5 PM
16°
Sunny
6 PM
15°
Sunny
7 PM
13°
Sunny
8 PM
13°
Clear
9 PM
12°
Clear
10 PM
11°
Partly Cloudy
11 PM
11°
Clear
3-Day Forecast
Daily overview for Union City, California
Today
Sunny
17°
/
8°
🌧️ 0% chance of rain
💧 Avg. humidity: 76%
💨 Max wind: 17.6 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:36 AM
🌇 Sunset: 07:43 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
15°
/
10°
🌧️ 0% chance of rain
💧 Avg. humidity: 79%
💨 Max wind: 18.7 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:34 AM
🌇 Sunset: 07:43 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Wed, Apr 15
Cloudy
16°
/
9°
🌧️ 0% chance of rain
💧 Avg. humidity: 77%
💨 Max wind: 18.4 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:33 AM
🌇 Sunset: 07:44 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Best Time to Visit Union City
Plan your trip to Union City, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Union City?
Current conditions in Union City: Overcast, temperature 12°C, humidity 89%.
What is the best time to visit Union City?
The best time to visit Union City is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Union City?
Union City is located at approximately 37.6° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Union City?
The wettest period in Union City is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Union City?
For visits to Union City during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Union City in?
Union City is located in United States, in the state of California.
What are the public holidays in Union City in 2026?
View the 2026 public holidays for Union City on our Holidays page.
What are the GPS coordinates used for the weather forecast in Union City?
The weather forecast for Union City uses coordinates 37.5873, -122.0216.