Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
San Ysidro starts May with an average high-temperature of a still pleasant 69.8°F (21°C), a minor shift from April's 68.5°F (20.3°C). Throughout May, San Ysidro encounters an average temperature drop to a mild 55.9°F (13.3°C).Humidity
With an average relative humidity of 68%, May is the most humid month.Rainfall
In San Ysidro, during May, the rain falls for 5.4 days and regularly aggregates up to 0.39" (10mm) of precipitation. In San Ysidro, during the entire year, the rain falls for 57.8 days and collects up to 7.28" (185mm) of precipitation.Daylight
In May, the average length of the day is 13h and 50min.On the first day of the month, sunrise is at 6:00 am and sunset at 7:29 pm. On the last day of May, sunrise is at 5:41 am and sunset at 7:50 pm PDT.
Sunshine
The average sunshine in May is 10.6h.UV index
In May, the average daily maximum UV index in San Ysidro is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 5 during May translates into these guidelines:
Prioritize safety - Suggestions to prevent sun damage are offered. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the most humid month?
What is the average humidity in May?
How much does it rain in May?
What is the average length of the day in May in San Ysidro?
When are sunrise and sunset in May?
How many hours of sunshine does San Ysidro have in May?
What is the UV index intensity in May?
Average temperature in May
San Ysidro, CA
- Average high temperature in May: 69.8°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (64°F).
- Average low temperature in May: 55.9°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).
Average pressure in May
San Ysidro, CA
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.88"Hg).
Average wind speed in May
San Ysidro, CA
- Average wind speed in May: 6mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in May
San Ysidro, CA
- Average humidity in May: 68%
The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is November (55%).
Average rainfall in May
San Ysidro, CA
- Average rainfall in May: 0.39"
The wettest month (with the highest rainfall) is February (1.5").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in May
San Ysidro, CA
- Average rainfall days in May: 5.4 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.8 days).
Average daylight in May /
Average sunshine in May
San Ysidro, CA
- Average daylight in May: 13h and 5min
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 6min).
- Average sunshine in May: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in May
San Ysidro, CA
- Average sunshine days in May: 23.8 days
The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (20.8 days).
Average UV index in May
San Ysidro, CA
- Average UV index in May: 5
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in May
San Ysidro, CA
- Average cloud cover in May: 24
The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in May
San Ysidro, 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).
San Ysidro, California, USA
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