May weather forecast and climate
Union City, CA

Weather in May

May, the last month of the spring, in Union City, is an agreeable month, with average temperature varying between 69.8°F (21°C) and 49.5°F (9.7°C).

Temperature

In Union City, the average high-temperature is practically the same as in April - a pleasant 69.8°F (21°C). In Union City, the average low-temperature is 49.5°F (9.7°C).

Humidity

In Union City, the average relative humidity is 67%.

Rainfall

May is the last month it rains. During 2.8 rainfall days, 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 Union City, the average length of the day in May is 14.2h.

Sunshine

The average sunshine in May is 11h.

UV index

In Union City, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in May in Union City?

In May, the average relative humidity in Union City, California, 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 length of the day in May is 14.2h.

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

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

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

The average daily maximum UV index in May in Union City is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

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

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"

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 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%).
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: 14.2h

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

  • Average sunshine in May: 11h

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 in May
Union City, CA

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

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

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 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

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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