May weather forecast and climate
South San Francisco, CA

A sign in large font of the South San Francisco City, California, on the hills over the scenic home setting below
A sign in large font of the South San Francisco City, California, on the hills over the scenic home setting below

Weather in May

May, the last month of the spring, in South San Francisco, is another comfortable month, with average temperature ranging between max 63°F (17.2°C) and min 51.1°F (10.6°C).

Temperature

In South San Francisco, California, the average high-temperature in May is essentially the same as in April - a still enjoyable 63°F (17.2°C). The average low-temperature, in South San Francisco, is 51.1°F (10.6°C).

Humidity

In South San Francisco, the average relative humidity in May is 76%.

Rainfall

In South San Francisco, during 3.6 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In South San Francisco, California, during the entire year, the rain falls for 53.6 days and collects up to 3.9" (99mm) of precipitation.

Daylight

In May, the average length of the day in South San Francisco is 14.2h.

Sunshine

In South San Francisco, the average sunshine is 10.4h.

UV index

In May, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in South San Francisco?

The average high-temperature, in May, is 63°F (17.2°C), while the average low-temperature is 51.1°F (10.6°C).

What is the average humidity in May in South San Francisco?

In South San Francisco, the average relative humidity in May is 76%.

How many days does it rain in May in South San Francisco?

In South San Francisco, in May, it is raining for 3.6 days, with typically 0.24" (6mm) of accumulated precipitation.

How many hours of daylight does South San Francisco have in May?

In May, the average length of the day in South San Francisco is 14.2h.

How many hours of sunshine does South San Francisco have in May?

In May, the average sunshine in South San Francisco, California, is 10.4h.

What is the UV index intensity in May in South San Francisco?

The average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in May
South San Francisco, CA

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

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).

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Average pressure in May
South San Francisco, CA

Average pressure in May - South San Francisco, CA
  • Average pressure in May: 29.98"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in May
South San Francisco, CA

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).

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Average humidity in May
South San Francisco, CA

Average humidity in May - South San Francisco, CA
  • Average humidity in May: 76%

The month with the highest relative humidity is August (78%).
Months with the lowest relative humidity are October and November (71%).

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Average rainfall in May
South San Francisco, CA

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").

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Average rainfall days in May
South San Francisco, CA

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).

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Average daylight in May /
Average sunshine in May
South San Francisco, CA

Average daylight in May / Average sunshine in May - South San Francisco, CA
  • Average daylight in May: 14.2h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in May: 10.4h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in May
South San Francisco, CA

Average sunshine days in May - South San Francisco, CA
  • Average sunshine days in May: 23.3 days

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).

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Average UV index in May
South San Francisco, CA

Average UV index in May - South San Francisco, CA
  • Average UV index in May: 4

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February and December (UV index 3).

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Average cloud cover in May
South San Francisco, CA

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).

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Average visibility in May
South San Francisco, CA

Average visibility in May - South San Francisco, CA
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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