May weather forecastSan Diego, CA
May
Weather in May
San Diego embarks upon its summer season in May. There is a noticeable decline in rainfall, dropping to 0.39" (10mm), indicating the beginning of a drier season. With the increase in temperature, there is a considerable augmentation in humidity to 72%, adding a hint of heaviness to the air. People start flocking to the beaches, taking advantage of the increased daylight and sea temperature. The city embraces the warmth of the upcoming summer and outdoor activities are joyfully celebrated.Temperature
A minimal variation is noted in San Diego's average high-temperature at the onset of May, reaching a still comfortable 67.6°F (19.8°C) from April's 66.2°F (19°C). In May, San Diego's temperature tends to fall to an average low of 56.3°F (13.5°C) during the night.Humidity
In San Diego, the average relative humidity in May is 72%.Rainfall
In May, the rain falls for 5.7 days. Throughout May, 0.39" (10mm) of precipitation is accumulated. In San Diego, during the entire year, the rain falls for 61.8 days and collects up to 8.7" (221mm) of precipitation.Ocean temperature
In May, the average ocean temperature in San Diego is 62.6°F (17°C).Note: In 62.6°F (17°C), swimming is not an enjoyable activity for most. As the temperature decreases from 69.8°F (21°C) to 59°F (15°C), it becomes harder to control breathing.
Daylight
The average length of the day in May in San Diego is 13h and 52min.On the first day of May in San Diego, sunrise is at 6:00 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 7:51 pm PDT.
Sunshine
In May, the average sunshine in San Diego, California, is 10.9h.UV index
In San Diego, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 5 in May translates into these instructions:
Act with care - The suggestion to avoid sunburn is emphasized. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
San Diego, CA
- Average high temperature in May: 67.6°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is February (63.1°F).
- Average low temperature in May: 56.3°F
The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).
Average pressure in May
San Diego, CA
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in May
San Diego, CA
- Average wind speed in May: 6.3mph
The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).
Average humidity in May
San Diego, CA
- Average humidity in May: 72%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (59%).
Average rainfall in May
San Diego, CA
- Average rainfall in May: 0.39"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in May
San Diego, CA
- Average rainfall days in May: 5.7 days
The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.7 days).
Average sea temperature in May
San Diego, CA
- Average sea temperature in May: 62.7°F
The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).
Average daylight in May /
Average sunshine in May
San Diego, 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 54min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in May
San Diego, CA
- Average sunshine days in May: 21.1 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (20.3 days).
Average UV index in May
San Diego, 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 Diego, CA
- Average cloud cover in May: 22
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in May
San Diego, 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).
