May weather forecast
Union City, CA

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Weather in May

The last month of the spring, May, is a pleasant month in Union City, California, with an average temperature ranging between min 49.5°F (9.7°C) and max 69.8°F (21°C).

Temperature

Union City experiences an average high-temperature of an agreeable 69.8°F (21°C) with the onset of May, subtly varied from April's 65.8°F (18.8°C). Union City, during May, witnesses an average low-temperature of 49.5°F (9.7°C).

Humidity

The average relative humidity in May in Union City is 67%.

Rainfall

May is the last month it rains in Union City. During 2.8 rainfall days, in May, Union City aggregates 0.12" (3mm) of precipitation. In Union City, during the entire year, the rain falls for 38 days and collects up to 2.13" (54mm) of precipitation.

Daylight

In May, the average length of the day is 14h and 13min.
On the first day of the month, sunrise is at 6:11 am and sunset at 7:58 pm. On the last day of May, sunrise is at 5:48 am and sunset at 8:23 pm PDT.

Sunshine

In May, the average sunshine in Union City is 11h.

UV index

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 5 translates into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
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Frequently asked questions

What is the average May temperature in Union City?

The high-temperature during May is 69.8°F (21°C) and the low-temperature is 49.5°F (9.7°C).

What is the average humidity in May in Union City?

The average relative humidity in May is 67%.

What is the last month it rains in Union City?

May is the last month it rains in Union City. During 2.8 rainfall days, in May, Union City aggregates 0.12" (3mm) of precipitation.

How many hours of daylight does Union City have in May?

In Union City, California, the average day length in May is 14h and 13min.

When are sunrise and sunset in May in Union City?

On the first day of May in Union City, California, sunrise is at 6:11 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:23 pm PDT.

How long on average sun shines in May in Union City?

In Union City, the average sunshine duration in May is 11h.

What is the UV index reading in May in Union City?

In Union City, California, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Union City, CA

Average temperature in May - Union City, CA
  • Average high temperature in May: 69.8°F

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).

  • Average low temperature in May: 49.5°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).

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Average pressure in May
Union City, CA

Average pressure in May - Union City, CA
  • Average pressure in May: 29.98"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).

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Average wind speed in May
Union City, CA

Average wind speed in May - Union City, CA
  • Average wind speed in May: 6.4mph

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 in May
Union City, CA

Average humidity in May - Union City, CA
  • Average humidity in May: 67%

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

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Average rainfall in May
Union City, CA

Average rainfall in May - Union City, CA
  • Average rainfall in May: 0.12"

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 in May
Union City, CA

Average rainfall days in May - Union City, CA
  • Average rainfall days in May: 2.8 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).

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Average daylight in May /
Average sunshine in May
Union City, CA

Average daylight in May / Average sunshine in May - Union City, CA
  • Average daylight in May: 14h and 1min

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 May: 11h 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).

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Average sunshine days in May
Union City, CA

Average sunshine days in May - Union City, CA
  • Average sunshine days in May: 27.8 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).

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Average UV index in May
Union City, CA

Average UV index in May - Union City, CA
  • Average UV index in May: 5

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).

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Average cloud cover in May
Union City, CA

Average cloud cover in May - Union City, CA
  • Average cloud cover in May: 22

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 6).

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Average visibility in May
Union City, CA

Average visibility in May - Union City, CA
  • Average visibility in May: 6mi

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).

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Union City, California, USA

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