May weather forecast and climate
San Bruno, CA

Weather in May

May, the last month of the spring, in San Bruno, is another comfortable month, with average temperature fluctuating between 62.8°F (17.1°C) and 51.3°F (10.7°C).

Temperature

In May, the average high-temperature is almost the same as in April - a still comfortable 62.8°F (17.1°C). In San Bruno, California, the average low-temperature is 51.3°F (10.7°C).

Humidity

In San Bruno, the average relative humidity is 77%.

Rainfall

In May, the rain falls for 6 days. Throughout May, 0.67" (17mm) of precipitation is accumulated. In San Bruno, during the entire year, the rain falls for 81.8 days and collects up to 13.46" (342mm) of precipitation.

Daylight

In May, the average length of the day is 14.2h.

Sunshine

In May, the average sunshine is 10.4h.

UV index

The average daily maximum UV index in San Bruno is 4. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.
[Resources]

FAQ

What is the temperature in May in San Bruno?

The average high-temperature, in May, in San Bruno, California, is 62.8°F (17.1°C), while the average low-temperature is 51.3°F (10.7°C).

What is the average humidity in May in San Bruno?

The average relative humidity in May is 77%.

How many days does it rain in May in San Bruno?

In San Bruno, during May, the rain falls for 6 days and regularly aggregates up to 0.67" (17mm) of precipitation.

What is the average length of the day in May in San Bruno?

The average length of the day in May in San Bruno is 14.2h.

How long on average sun shines in May in San Bruno?

In San Bruno, the average sunshine in May is 10.4h.

What is the UV index intensity in May in San Bruno?

In San Bruno, California, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in May
San Bruno, CA

Average temperature in May - San Bruno, CA
  • Average high temperature in May: 62.8°F

The warmest month (with the highest average high temperature) is September (69.8°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in May: 51.3°F

The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is December (47.7°F).

[Resources]

Average pressure in May
San Bruno, CA

Average pressure in May - San Bruno, 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").

[Resources]

Average wind speed in May
San Bruno, CA

Average wind speed in May - San Bruno, CA
  • Average wind speed in May: 8.4mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest months (with the lowest average wind speed) are August and September (6.3mph).

[Resources]

Average humidity in May
San Bruno, CA

Average humidity in May - San Bruno, CA
  • Average humidity in May: 77%

The month with the highest relative humidity is August (79%).
Months with the lowest relative humidity are October and November (71%).

[Resources]

Average rainfall in May
San Bruno, CA

Average rainfall in May - San Bruno, CA
  • Average rainfall in May: 0.67"

The wettest month (with the highest rainfall) is February (2.72").
The driest months (with the least rainfall) are July and August (0.04").

[Resources]

Average rainfall days in May
San Bruno, CA

Average rainfall days in May - San Bruno, CA
  • Average rainfall days in May: 6 days

The month with the highest number of rainy days is March (13.3 days).
Months with the least rainy days are July and August (2.2 days).

[Resources]

Average daylight in May /
Average sunshine in May
San Bruno, CA

Average daylight in May / Average sunshine in May - San Bruno, 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: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.8h).

[Resources]

Average sunshine days in May
San Bruno, CA

Average sunshine days in May - San Bruno, CA
  • Average sunshine days in May: 22.2 days

The month with the most sunshine days is July (27.3 days).
The month with the least sunshine days is March (16.3 days).

[Resources]

Average UV index in May
San Bruno, CA

Average UV index in May - San Bruno, 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, November and December (UV index 3).

[Resources]

Average cloud cover in May
San Bruno, CA

Average cloud cover in May - San Bruno, CA
  • Average cloud cover in May: 29

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).

[Resources]

Average visibility in May
San Bruno, CA

Average visibility in May - San Bruno, 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).

[Resources]