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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is a moderate winter month in Union City, California, with an average temperature fluctuating between 57.6°F (14.2°C) and 44.2°F (6.8°C). The average high-temperature in January, at a still refreshing 57.6°F (14.2°C), reveals a modest deviation from December's 56.3°F (13.5°C). Weather in January »
Weather in February
February, the last month of the winter in Union City, is another refreshing month, with an average temperature varying between 44.2°F (6.8°C) and 59.7°F (15.4°C). With February's advent, Union City sees an average high-temperature of a still moderate 59.7°F (15.4°C), subtly shifted from January's 57.6°F (14.2°C). Weather in February »
Weather in March
The first month of the spring, March, is a refreshing month in Union City, California, with an average temperature ranging between min 45°F (7.2°C) and max 62.2°F (16.8°C). The average high-temperature is a comfortable 62.2°F (16.8°C) in March, hardly different from the 59.7°F (15.4°C) recorded in February. Weather in March »
Weather in April
April, the same as March, is another comfortable spring month in Union City, California, with an average temperature varying between 46.6°F (8.1°C) and 65.8°F (18.8°C). Union City experiences an average high-temperature of a still comfortable 65.8°F (18.8°C) with the onset of April, subtly varied from March's 62.2°F (16.8°C). Weather in April »
Weather in May
May, the last month of the spring in Union City, is an agreeable month, with an average temperature fluctuating between 69.8°F (21°C) and 49.5°F (9.7°C). The advent of May brings an average high-temperature of a pleasant 69.8°F (21°C), exhibiting minor difference from the previous month. Weather in May »
Weather in June
June, the first month of the summer in Union City, is a warm month, with an average temperature ranging between max 76.8°F (24.9°C) and min 53.8°F (12.1°C). A subtle rise in the average high-temperature is observed during June, adjusting from an agreeable 69.8°F (21°C) in May to a warm 76.8°F (24.9°C). Weather in June »
Weather in July
July, like June, in Union City, California, is another warm summer month, 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). The warmest period falls in July and August, when the average high-temperature reaches 80.1°F (26.7°C). Weather in July »
Weather in August
August, the last month of the summer in Union City, is another warm month, with an average temperature ranging between max 80.1°F (26.7°C) and min 56.7°F (13.7°C). July and August, when the average high-temperature reaches 80.1°F (26.7°C), are the warmest months. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Union City, California, with an average temperature ranging between max 78.6°F (25.9°C) and min 56.7°F (13.7°C). The introduction of September sees an average high-temperature of a still moderately hot 78.6°F (25.9°C), hardly deviating from August. Weather in September »
Weather in October
October, like September, is an agreeable autumn month in Union City, California, with an average temperature fluctuating between 53.8°F (12.1°C) and 72.1°F (22.3°C). The beginning of October brings a slight decrease in the average high-temperature, transitioning from a warm 78.6°F (25.9°C) in September to an agreeable 72.1°F (22.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Union City, is another comfortable month, with temperature in the range of an average high of 63.5°F (17.5°C) and an average low of 48.2°F (9°C). The arrival of November is marked by a minor reduction in average high-temperature, sliding from a pleasant 72.1°F (22.3°C) in October to an enjoyable 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 an average temperature fluctuating between 43.7°F (6.5°C) and 56.3°F (13.5°C). Union City's temperature records reveal December as the coldest month, marked by average highs of 56.3°F (13.5°C) and lows of 43.7°F (6.5°C). Weather in December »
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How many days does it rain?
Throughout the year, there are 38 rainfall days, and 2.13" (54mm) of precipitation is accumulated.
What is the month with the lowest UV index?
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?
The month with the most rainfall is February, when the rain falls for 4.4 days and typically aggregates up to 0.47" (12mm) of precipitation.
What is the most humid month?
With an average relative humidity of 73%, March is the most humid month.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
What is the driest month?
In Union City, rain does not fall in June through August.
When are the longest days?
June has the longest days of the year, with an average of 14h and 42min of daylight.
What is the month with the highest UV index?
The months with the highest UV index in Union City are June and July, with an average maximum UV index of 6.
What are the warmest months?
The yearly peak temperatures occur in July and August, averaging a high-temperature of 80.1°F (26.7°C).
What month has the most sunshine?
With an average of 12.2h of sunshine, July has the most sunshine of the year.
What is the least humid month?
September and October, with an average relative humidity of 62%, are the least humid months.
When does it rain?
January through May, September through December are months with rainfall.
What time of the year is the coldest?
December is the coldest month, with the temperature often reaching an average high of 56.3°F (13.5°C) and an average low of 43.7°F (6.5°C).
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 36min of daylight.
What is the month with the least sunshine in Union City?
The month with the least sunshine is December, with an average of 6h of sunshine.
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).
The 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).
Average pressure
Union City, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed
Union City, CA
- Average wind speed in January:
4.8mph - Average wind speed in February:
5.7mph - Average wind speed in March:
6mph - Average wind speed in April:
6.2mph - Average wind speed in May:
6.4mph - Average wind speed in June:
6.1mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.1mph - Average wind speed in September:
4.8mph - Average wind speed in October:
4.7mph - Average wind speed in November:
4.7mph - Average wind speed in December:
5.3mph
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).
Average humidity
Union City, CA
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are September and October (62%).
Average rainfall
Union City, CA
- Average rainfall in January:
0.31" - Average rainfall in February:
0.47" - Average rainfall in March:
0.43" - Average rainfall in April:
0.12" - Average rainfall in May:
0.12" - Average rainfall in June:
0"
The wettest month (with the highest rainfall) is February (0.47").
The driest months (with the least rainfall) are June, July and August (0").
Average rainfall days
Union City, CA
- Average rainfall days in January:
5.4 days - Average rainfall days in February:
4.4 days - Average rainfall days in March:
7.3 days - Average rainfall days in April:
4.7 days - Average rainfall days in May:
2.8 days - Average rainfall days in June:
0.6 days
- Average rainfall days in July:
0.3 days - Average rainfall days in August:
0.4 days - Average rainfall days in September:
1.2 days - Average rainfall days in October:
1.5 days - Average rainfall days in November:
3.1 days - Average rainfall days in December:
6.3 days
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).
Average daylight / Average sunshine
Union City, CA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
6h and 2min - Average sunshine in February:
6h and 2min - Average sunshine in March:
8h and 0min - Average sunshine in April:
10h and 3min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 5min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
12h and 0min - Average sunshine in September:
11h and 1min - Average sunshine in October:
7h and 1min - Average sunshine in November:
6h and 4min - Average sunshine in December:
6h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days
Union City, CA
- Average sunshine days in January:
24.8 days - Average sunshine days in February:
22.2 days - Average sunshine days in March:
22.3 days - Average sunshine days in April:
24.8 days - Average sunshine days in May:
27.8 days - Average sunshine days in June:
29 days
- Average sunshine days in July:
30.4 days - Average sunshine days in August:
30.4 days - Average sunshine days in September:
28.5 days - Average sunshine days in October:
28.4 days - Average sunshine days in November:
25.5 days - Average sunshine days in December:
24 days
The 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).
Average UV index
Union City, CA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Union City, CA
The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility
Union City, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Union City, California, USA
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