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
The advent of May sees the average high-temperature at a still refreshing 63°F (17.2°C), subtly shifted from April's 61.3°F (16.3°C). Throughout May nights, South San Francisco registers an average low-temperature of 51.1°F (10.6°C).Humidity
In May, the average relative humidity in South San Francisco is 76%.Rainfall
In South San Francisco, in May, during 3.6 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. Throughout the year, in South San Francisco, California, there are 53.6 rainfall days, and 3.9" (99mm) of precipitation is accumulated.Daylight
In South San Francisco, the average length of the day in May is 14h and 13min.On the first day of the month, sunrise is at 6:12 am and sunset at 8:00 pm. On the last day of May, in South San Francisco, sunrise is at 5:49 am and sunset at 8:25 pm PDT.
Sunshine
In South San Francisco, the average sunshine in May is 10.4h.UV index
The average daily maximum UV index in May in South San Francisco is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In May, a regular UV index of 4 translates into these guidelines:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Frequently asked questions
What are May temperatures in South San Francisco?
What is the average humidity in May in South San Francisco?
How much does it rain in South San Francisco in May?
What is the average length of the day in May in South San Francisco?
What time are sunrise and sunset in May in South San Francisco?
How long on average sun shines in May in South San Francisco?
How high is the UV index in May in South San Francisco?
Average temperature in May
South San Francisco, CA
- Average high temperature in May: 63°F
The warmest month (with the highest average high temperature) is September (70°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in May: 51.1°F
The months with the highest average low temperature are August and September (56.5°F).
The coldest months (with the lowest average low temperature) are January, February and December (47.8°F).
Average pressure in May
South San Francisco, CA
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in May
South San Francisco, CA
- Average wind speed in May: 8.3mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).
Average humidity in May
South San Francisco, CA
- Average humidity in May: 76%
The month with the highest relative humidity is August (78%).
The months with the lowest relative humidity are October and November (71%).
Average rainfall in May
South San Francisco, CA
- Average rainfall in May: 0.24"
The wettest month (with the highest rainfall) is February (0.79").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days in May
South San Francisco, CA
- Average rainfall days in May: 3.6 days
The month with the highest number of rainy days is March (9.4 days).
The month with the least rainy days is June (1.1 days).
Average daylight in May /
Average sunshine in May
South San Francisco, CA
- Average daylight in May: 14h and 1min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in May: 10h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in May
South San Francisco, CA
- Average sunshine days in May: 23.3 days
The months with the most sunshine days are June, July and September (26.3 days).
The month with the least sunshine days is March (19.4 days).
Average UV index in May
South San Francisco, CA
- Average UV index in May: 4
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).
Average cloud cover in May
South San Francisco, CA
- Average cloud cover in May: 28
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in May
South San Francisco, 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).
South San Francisco, California, USA
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