May weather forecast and climate
O'Brien, CA

Weather in May

The last month of the spring, May, is a pleasant month in O'Brien, California, with average temperature ranging between min 46°F (7.8°C) and max 71.2°F (21.8°C).

Temperature

In O'Brien, the average high-temperature in May slightly increases, from a comfortable 62.4°F (16.9°C) in April, to a pleasant 71.2°F (21.8°C). In May, the average low-temperature is 46°F (7.8°C).

Humidity

The average relative humidity in May is 58%.

Rainfall

In O'Brien, California, during May, the rain falls for 10.3 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, in O'Brien, there are 102.3 rainfall days, and 24.21" (615mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In May, the average length of the day is 14.5h.

Sunshine

In O'Brien, California, the average sunshine is 11h.

UV index

In O'Brien, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 in May interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in May in O'Brien?

The average high-temperature, in May, in O'Brien, California, is 71.2°F (21.8°C), while the average low-temperature is 46°F (7.8°C).

What is the average humidity in May in O'Brien?

In O'Brien, California, the average relative humidity in May is 58%.

How many days does it rain in May in O'Brien?

In May, in O'Brien, the rain falls for 10.3 days. Throughout May, 1.89" (48mm) of precipitation is accumulated.

When it does not snow in O'Brien?

In O'Brien, California, snow does not fall in April through October.

How many hours of daylight does O'Brien have in May?

The average length of the day in May in O'Brien is 14.5h.

How many hours of sunshine does O'Brien have in May?

In O'Brien, California, the average sunshine in May is 11h.

How high is the UV index in May in O'Brien?

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in May
O'Brien, CA

Average temperature in May - O
  • Average high temperature in May: 71.2°F

The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is December (47.8°F).

  • Average low temperature in May: 46°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).

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Average pressure in May
O'Brien, CA

Average pressure in May - O
  • Average pressure in May: 29.96"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is August (29.92").

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Average wind speed in May
O'Brien, CA

Average wind speed in May - O
  • Average wind speed in May: 5.1mph

The windiest months (with the highest average wind speed) are March and October (5.3mph).
The calmest months (with the lowest average wind speed) are August and November (4.5mph).

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Average humidity in May
O'Brien, CA

Average humidity in May - O
  • Average humidity in May: 58%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is August (37%).

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Average rainfall in May
O'Brien, CA

Average rainfall in May - O
  • Average rainfall in May: 1.89"

The wettest month (with the highest rainfall) is March (4.8").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days in May
O'Brien, CA

Average rainfall days in May - O
  • Average rainfall days in May: 10.3 days

The month with the highest number of rainy days is March (16.8 days).
The month with the least rainy days is August (1.7 days).

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Average snowfall in May
O'Brien, CA

Average snowfall in May - O
  • Average snowfall in May: 0"

The month with the highest snowfall is November (1.3").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
O'Brien, CA

Average snowfall days in May - O
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (1.9 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
O'Brien, CA

Average daylight in May / Average sunshine in May - O
  • Average daylight in May: 14.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • 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: 5.3h).

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Average sunshine days in May
O'Brien, CA

Average sunshine days in May - O
  • Average sunshine days in May: 18.3 days

The month with the most sunshine days is August (27.1 days).
The month with the least sunshine days is March (11.8 days).

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Average UV index in May
O'Brien, CA

Average UV index in May - O
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are February, November and December (UV index 2).

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Average cloud cover in May
O'Brien, CA

Average cloud cover in May - O
  • Average cloud cover in May: 23

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in May
O'Brien, CA

Average visibility in May - O
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).

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