May weather forecast and climate
Opal Cliffs, CA

Weather in May

The last month of the spring, May, is also an enjoyable month in Opal Cliffs, California, with average temperature varying between 64.9°F (18.3°C) and 49.1°F (9.5°C).

Temperature

In Opal Cliffs, California, the average high-temperature is practically the same as in April - a still enjoyable 64.9°F (18.3°C). The average low-temperature, in May, is 49.1°F (9.5°C).

Humidity

In May, the average relative humidity in Opal Cliffs is 74%.

Rainfall

In Opal Cliffs, in May, it is raining for 6.5 days, with typically 0.67" (17mm) of accumulated precipitation. In Opal Cliffs, during the entire year, the rain falls for 77.9 days and collects up to 14.45" (367mm) of precipitation.

Ocean temperature

In Opal Cliffs, in May, the average water temperature is 54.1°F (12.3°C).
Note: Swimming in 54.1°F (12.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In May, the average length of the day in Opal Cliffs is 14.2h.

Sunshine

The average sunshine in May is 10.3h.

UV index

The average daily maximum UV index in Opal Cliffs is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 in May transform into the following instructions:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in May in Opal Cliffs?

In Opal Cliffs, in May, the average high-temperature is 64.9°F (18.3°C), and the average low-temperature is 49.1°F (9.5°C).

What is the average humidity in May in Opal Cliffs?

In Opal Cliffs, California, the average relative humidity in May is 74%.

How much does it rain in Opal Cliffs in May?

In May, in Opal Cliffs, the rain falls for 6.5 days. Throughout May, 0.67" (17mm) of precipitation is accumulated.

What is the ocean temperature in May in Opal Cliffs?

In May, the average ocean temperature in Opal Cliffs is 54.1°F (12.3°C). Swimming in 54.1°F (12.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in May in Opal Cliffs?

The average length of the day in May is 14.2h.

How long on average sun shines in May in Opal Cliffs?

The average sunshine in May in Opal Cliffs is 10.3h.

How high is the UV index in May in Opal Cliffs?

In Opal Cliffs, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in May
Opal Cliffs, CA

Average temperature in May - Opal Cliffs, CA
  • Average high temperature in May: 64.9°F

The warmest months (with the highest average high temperature) are August and September (73°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in May: 49.1°F

The month with the highest average low temperature is September (55.2°F).
The coldest month (with the lowest average low temperature) is February (45.5°F).

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Average pressure in May
Opal Cliffs, CA

Average pressure in May - Opal Cliffs, CA
  • Average pressure in May: 29.99"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in May
Opal Cliffs, CA

Average wind speed in May - Opal Cliffs, CA
  • Average wind speed in May: 7.2mph

The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in May
Opal Cliffs, CA

Average humidity in May - Opal Cliffs, CA
  • Average humidity in May: 74%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in May
Opal Cliffs, CA

Average rainfall in May - Opal Cliffs, CA
  • Average rainfall in May: 0.67"

The wettest month (with the highest rainfall) is December (2.8").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in May
Opal Cliffs, CA

Average rainfall days in May - Opal Cliffs, CA
  • Average rainfall days in May: 6.5 days

The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is August (1.2 days).

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Average sea temperature in May
Opal Cliffs, CA

Average sea temperature in May - Opal Cliffs, CA
  • Average sea temperature in May: 54.2°F

The best months for swimming (with the highest average sea temperature) are August and September (58.1°F).
The coldest month (with the lowest average sea temperature) is April (53.8°F).

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Average daylight in May /
Average sunshine in May
Opal Cliffs, CA

Average daylight in May / Average sunshine in May - Opal Cliffs, 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: 9.7h).

  • Average sunshine in May: 10.3h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in May
Opal Cliffs, CA

Average sunshine days in May - Opal Cliffs, CA
  • Average sunshine days in May: 22.1 days

The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (16.4 days).

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Average UV index in May
Opal Cliffs, CA

Average UV index in May - Opal Cliffs, CA
  • Average UV index in May: 4

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February and November (UV index 3).

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Average cloud cover in May
Opal Cliffs, CA

Average cloud cover in May - Opal Cliffs, CA
  • Average cloud cover in May: 30

The month with the most cloud cover is March (Cloud cover 38).
Months with the least cloud cover are July and September (Cloud cover 15).

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Average visibility in May
Opal Cliffs, CA

Average visibility in May - Opal Cliffs, 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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