May weather forecastSan Marcos, CA
May
Weather in May
May, the last month of the spring in San Marcos, is also an agreeable month, with an average temperature varying between 70.3°F (21.3°C) and 53.6°F (12°C).Temperature
The advent of May presents an average high-temperature of a still agreeable 70.3°F (21.3°C), maintaining a close correlation with the preceding month. San Marcos sees an average low-temperature of 53.6°F (12°C) during May.Humidity
The most humid month in San Marcos, California, is May, with an average relative humidity of 70%.Rainfall
In May, the rain falls for 4.8 days. Throughout May, 0.35" (9mm) of precipitation is accumulated. In San Marcos, during the entire year, the rain falls for 52.1 days and collects up to 6.1" (155mm) of precipitation.Daylight
In May, the average length of the day in San Marcos is 13h and 53min.On the first day of the month, sunrise is at 5:59 am and sunset at 7:31 pm. On the last day of May, in San Marcos, sunrise is at 5:40 am and sunset at 7:52 pm PDT.
Sunshine
In May, the average sunshine is 11.2h.UV index
In May, the average daily maximum UV index in San Marcos, California, is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 5 in May translates into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
San Marcos, CA
- Average high temperature in May: 70.3°F
The warmest month (with the highest average high temperature) is August (81.9°F).
The months with the lowest average high temperature are February and December (63.3°F).
- Average low temperature in May: 53.6°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (48°F).
Average pressure in May
San Marcos, CA
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in May
San Marcos, CA
- Average wind speed in May: 5.5mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is October (4.4mph).
Average humidity in May
San Marcos, CA
- Average humidity in May: 70%
The month with the highest relative humidity is May (70%).
The month with the lowest relative humidity is November (56%).
Average rainfall in May
San Marcos, CA
- Average rainfall in May: 0.35"
The wettest month (with the highest rainfall) is December (1.22").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in May
San Marcos, CA
- Average rainfall days in May: 4.8 days
The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.2 days).
Average daylight in May /
Average sunshine in May
San Marcos, 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: 11h and 12min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in May
San Marcos, CA
- Average sunshine days in May: 21.3 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20 days).
Average UV index in May
San Marcos, 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, March, November and December (UV index 4).
Average cloud cover in May
San Marcos, CA
- Average cloud cover in May: 19
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in May
San Marcos, 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).
