Monthly weather forecast and climate
Union City, CA

Weather in January

January, like December, is another mild winter month in Union City, California, with average temperature ranging between max 57.6°F (14.2°C) and min 44.2°F (6.8°C). In January, the average high-temperature is practically the same as in December - a still mild 57.6°F (14.2°C). Weather in January »

Weather in February

February, the last month of the winter, in Union City, is also a moderate month, with temperature in the range of an average high of 59.7°F (15.4°C) and an average low of 44.2°F (6.8°C). In Union City, the average high-temperature is practically the same as in January - a still moderate 59.7°F (15.4°C). Weather in February »

Weather in March

March, the first month of the spring, in Union City, is an enjoyable month, with average temperature fluctuating between 45°F (7.2°C) and 62.2°F (16.8°C). In March, the average high-temperature is essentially the same as in February - a comfortable 62.2°F (16.8°C). Weather in March »

Weather in April

April, like March, in Union City, California, is another enjoyable spring month, with average temperature varying between 46.6°F (8.1°C) and 65.8°F (18.8°C). In Union City, California, the average high-temperature is almost the same as in March - a still enjoyable 65.8°F (18.8°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Union City, California, with average temperature varying between 49.5°F (9.7°C) and 69.8°F (21°C). In May, the average high-temperature is essentially the same as in April - a pleasant 69.8°F (21°C). Weather in May »

Weather in June

June, the first month of the summer, in Union City, is a moderately hot month, with average temperature varying between 53.8°F (12.1°C) and 76.8°F (24.9°C). In June, the average high-temperature marginally rises, from a pleasant 69.8°F (21°C) in May, to a moderately hot 76.8°F (24.9°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Union City, California, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 55.2°F (12.9°C). July and August, with an average high-temperature of 80.1°F (26.7°C), are the warmest months. Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Union City, California, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 56.7°F (13.7°C). The warmest months are July and August, with an average high-temperature of 80.1°F (26.7°C). Weather in August »

Weather in September

September, the first month of the autumn, in Union City, is still a warm month, with average temperature fluctuating between 78.6°F (25.9°C) and 56.7°F (13.7°C). In September, the average high-temperature is essentially the same as in August - a still warm 78.6°F (25.9°C). Weather in September »

Weather in October

October, like September, is another pleasant autumn month in Union City, California, with average temperature fluctuating between 53.8°F (12.1°C) and 72.1°F (22.3°C). In Union City, California, the average high-temperature in October slightly decreases, from a moderately hot 78.6°F (25.9°C) in September, to a pleasant 72.1°F (22.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is another comfortable month in Union City, California, with average temperature varying between 48.2°F (9°C) and 63.5°F (17.5°C). In Union City, the average high-temperature in November marginally drops, from a pleasant 72.1°F (22.3°C) in October, to a comfortable 63.5°F (17.5°C). Weather in November »

Weather in December

December, the first month of the winter, in Union City, is also a moderate month, with average temperature ranging between max 56.3°F (13.5°C) and min 43.7°F (6.5°C). December is the coldest month, with an average high-temperature of 56.3°F (13.5°C) and an average low-temperature of 43.7°F (6.5°C). Weather in December »
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FAQ

How many days does it rain in Union City?

In Union City, California, during the entire year, the rain falls for 38 days and collects up to 2.13" (54mm) of precipitation.

What is the month with the lowest UV index in Union City?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.

What is the wettest month in Union City?

February is the month with the most rainfall. Rain falls for 4.4 days and accumulates 0.47" (12mm) of precipitation.

What is the most humid month in Union City?

The most humid month in Union City is March, with an average relative humidity of 73%.

What is the driest month in Union City?

June through August are months without rainfall in Union City.

When are the longest days in Union City?

With an average of 14.7h of daylight, June has the longest days of the year.

When is the highest UV index in Union City?

June and July, with an average maximum UV index of 6, are months with the highest UV index.

What are the warmest months in Union City?

Warmest months are July and August, with an average high-temperature of 80.1°F (26.7°C).

What month has the most sunshine in Union City?

July has the most sunshine of the year, with an average of 12.2h of sunshine.

What is the least humid month in Union City?

September and October, with an average relative humidity of 62%, are the least humid months.

When does it rain in Union City?

Months with rainfall in Union City are January through May, September through December.

What is the coldest month in Union City?

The coldest month is December, with an average high-temperature of 56.3°F (13.5°C) and an average low-temperature of 43.7°F (6.5°C).

What is the month with the shortest days in Union City?

December has the shortest days of the year in Union City, California, with an average of 9.6h of daylight.

What is the month with the least sunshine in Union City?

The month with the least sunshine in Union City, California, is December, with an average of 6h of sunshine.

Average temperature
Union City, CA

Average temperature - Union City, CA

The warmest months (with the highest average high temperature) are July and August (80.1°F).
The month with the lowest average high temperature is December (56.3°F).

Months with the highest average low temperature are August and September (56.7°F).
The coldest month (with the lowest average low temperature) is December (43.7°F).

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Average pressure
Union City, CA

Average pressure - Union City, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed
Union City, CA

Average wind speed - Union City, CA

The windiest month (with the highest average wind speed) is May (6.4mph).
The calmest months (with the lowest average wind speed) are October and November (4.7mph).

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Average humidity
Union City, CA

Average humidity - Union City, CA

The month with the highest relative humidity is March (73%).
Months with the lowest relative humidity are September and October (62%).

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Average rainfall
Union City, CA

Average rainfall - Union City, CA

The wettest month (with the highest rainfall) is February (0.47").
The driest months (with the least rainfall) are June, July and August (0").

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Average rainfall days
Union City, CA

Average rainfall days - Union City, CA

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is July (0.3 days).

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Average daylight / Average sunshine
Union City, CA

Average daylight / Average sunshine - Union City, CA

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days
Union City, CA

Average sunshine days - Union City, CA

Months with the most sunshine days are July and August (30.4 days).
The month with the least sunshine days is February (22.2 days).

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Average UV index
Union City, CA

Average UV index - Union City, CA

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average visibility
Union City, CA

Average visibility - Union City, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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