San Clemente
California, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
San Clemente, CA

May, the last month of the spring, in San Clemente, is also an enjoyable month, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 67.6°F (19.8°C).

Temperature

In May, the average high-temperature is essentially the same as in April - a still comfortable 67.6°F (19.8°C). In May, the average low-temperature is 55°F (12.8°C).

Humidity

In May, the average relative humidity is 74%.

Rainfall

In San Clemente, during 4.6 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, there are 51.1 rainfall days, and 3.66" (93mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature in San Clemente is 63.1°F (17.3°C).
Note: Swimming in 63.1°F (17.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In San Clemente, California, the average length of the day in May is 13.9h.

Sunshine

The average sunshine in May is 10.6h.

UV index

In San Clemente, California, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 5 in May transform into the following instructions:
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. 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.

What is the temperature in May in San Clemente?

In May, in San Clemente, California, the average high-temperature is 67.6°F (19.8°C), and the average low-temperature is 55°F (12.8°C).

What is the average humidity in May in San Clemente?

In San Clemente, California, the average relative humidity in May is 74%.

How much does it rain in San Clemente in May?

In San Clemente, in May, during 4.6 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

What is the ocean temperature in May in San Clemente?

In San Clemente, in May, the average water temperature is 63.1°F (17.3°C). For swimming, a surface water temperature of 63.1°F (17.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

What is the average length of the day in May in San Clemente?

In San Clemente, the average length of the day in May is 13.9h.

How long on average sun shines in May in San Clemente?

The average sunshine in May in San Clemente, California, is 10.6h.

How high is the UV index in May in San Clemente?

The average daily maximum UV index in May in San Clemente, California, is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in May - San Clemente, CA
  • Average high temperature in May: 67.6°F

The warmest month (with the highest average high temperature) is September (77.4°F).
The month with the lowest average high temperature is December (62.6°F).

  • Average low temperature in May: 55°F

Months with the highest average low temperature are August and September (63.5°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).

Average humidity in May - San Clemente, CA
  • Average humidity in May: 74%

The month with the highest relative humidity is June (75%).
The month with the lowest relative humidity is November (60%).

Average rainfall in May - San Clemente, CA
  • Average rainfall in May: 0.24"

The wettest month (with the highest rainfall) is December (0.71").
The driest month (with the lowest rainfall) is June (0.08").

Average rainfall days in May - San Clemente, CA
  • Average rainfall days in May: 4.6 days

The month with the highest number of rainy days is March (7.3 days).
The month with the lowest number of rainy days is June (1.4 days).

Average sea temperature in May - San Clemente, CA
  • Average sea temperature in May: 63°F

The best month for swimming (with the highest average sea temperature) is August (68.3°F).
Coldest months (with the lowest average sea temperature) are January and February (58.9°F).

Average daylight in May / Average sunshine in May - San Clemente, CA
  • Average daylight in May: 13.9h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in May: 10.6h

Months with most sunshine are July and August (Average sunshine: 11.8h).
The month with least sunshine is December (Average sunshine: 6.5h).

Average UV index in May - San Clemente, CA
  • Average UV index in May: 5

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).