May weather forecastSan Clemente, CA
May
Weather in May
The last month of the spring, May, is another comfortable month in San Clemente, California, with an average temperature fluctuating between 67.6°F (19.8°C) and 55°F (12.8°C).Temperature
The transition into May marks the average high-temperature at a still refreshing 67.6°F (19.8°C), differing minimally from April's 66.6°F (19.2°C). San Clemente witnesses a consistent average low-temperature of 55°F (12.8°C) throughout May.Humidity
In May, the average relative humidity is 74%.Rainfall
In San Clemente, California, during May, the rain falls for 4.6 days and regularly aggregates up to 0.24" (6mm) of precipitation. In San Clemente, during the entire year, the rain falls for 51.1 days and collects up to 3.66" (93mm) of precipitation.Ocean temperature
In San Clemente, the average seawater temperature in May is 63.1°F (17.3°C).Note: Swimming is not a pleasant activity for most when the water temperature is 63.1°F (17.3°C). As the water temperature drops from 69.8°F (21°C) to 59°F (15°C), breathing becomes more difficult to control.
Daylight
In May, the average length of the day is 13h and 54min.On the first day of the month, sunrise is at 6:01 am and sunset at 7:33 pm. On the last day of May, sunrise is at 5:41 am and sunset at 7:54 pm PDT.
Sunshine
The average sunshine in May is 10.6h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The UV index of 5 in May translates into these instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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
The 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 pressure in May
San Clemente, CA
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
San Clemente, CA
- Average wind speed in May: 6mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (4.9mph).
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 least 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 least 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).
The 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: 13h and 54min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in May: 10h and 36min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in May
San Clemente, CA
- Average sunshine days in May: 23 days
The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (21.6 days).
Average UV index in May
San Clemente, CA
- Average UV index in May: 5
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in May
San Clemente, CA
- Average cloud cover in May: 27
The months with the most cloud cover are March and May (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 11).
Average visibility in May
San Clemente, 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).
