May weather forecast
San Bruno, CA

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Weather in May

The last month of the spring, May, is also an enjoyable month in San Bruno, California, with temperature in the range of an average high of 62.8°F (17.1°C) and an average low of 51.3°F (10.7°C).

Temperature

On the advent of May, San Bruno's average high-temperature exhibits a minor adjustment to a still refreshing 62.8°F (17.1°C) from April's 60.8°F (16°C). In San Bruno, an average nighttime temperature of 51.3°F (10.7°C) is expected during May.

Humidity

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

Rainfall

In May, in San Bruno, the rain falls for 6 days. Throughout May, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 81.8 rainfall days, and 13.46" (342mm) of precipitation is accumulated.

Daylight

In San Bruno, the average length of the day in May is 14h and 13min.
On the first day of May, sunrise is at 6:13 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:25 pm PDT.

Sunshine

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

UV index

The average daily maximum UV index in May in San Bruno is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 4 during May leads to these instructions:
Exercise prevention - Precautions against solar damage are endorsed. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
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Frequently asked questions

What are the temperatures in San Bruno in May?

May temperatures vary between a high-temperature of 62.8°F (17.1°C) and a low-temperature of 51.3°F (10.7°C).

What is the average humidity in May in San Bruno?

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

How much does it rain in San Bruno in May?

In San Bruno, California, 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 day length in May is 14h and 13min.

When are sunrise and sunset in May in San Bruno?

In May, on the first day of the month, sunrise is at 6:13 am and sunset at 8:00 pm. On the last day of the month, in San Bruno, sunrise is at 5:49 am and sunset at 8:25 pm PDT.

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

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

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

The average daily maximum UV index in May in San Bruno, California, is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

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Average pressure in May
San Bruno, CA

Average pressure in May - San Bruno, 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).

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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).

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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%).
The months with the lowest relative humidity are October and November (71%).

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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").

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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).
The months with the least rainy days are July and August (2.2 days).

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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: 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 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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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).

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Average UV index in May
San Bruno, CA

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

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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).

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Average visibility in May
San Bruno, CA

Average visibility in May - San Bruno, 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).

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San Bruno, California, USA

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