August weather forecast
San Mateo, CA

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A breathtaking view of the scenic spot of the Devil
A breathtaking view of the scenic spot of the Devil's Slide Sheer Cliff over the pacific Coast in San Mateo, California

Weather in August

August weather in San Mateo stays in line with the warm and dry pattern established in July. Despite minimal changes in temperature from the previous month, the peak temperature this month records 71.2°F (21.8°C). As one of the driest months of the year, August is sterling for residents and tourists enthusiastic for open-air activities. With its balmy temperature, relatively low humidity, and maximum hours of sunshine, August embodies the perfect summer experience.

Temperature

August and September, with an average high-temperature of 71.2°F (21.8°C), are the warmest months in San Mateo.

Humidity

The months with the highest humidity are March and August, with an average relative humidity of 76%.

Rainfall

June through August are months without rainfall.

Daylight

In San Mateo, California, the average length of the day in August is 13h and 34min.
On the first day of the month, sunrise is at 6:14 am and sunset at 8:17 pm. On the last day of August, sunrise is at 6:39 am and sunset at 7:39 pm PDT.

Sunshine

In San Mateo, the average sunshine in August is 11.8h.

UV index

June through September, with an average maximum UV index of 5, are months with the highest UV index in San Mateo, California. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: A typical high UV index of 5 in August suggests the following recommendations:
Make use of precautions - It is urged to ward off sun damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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Frequently asked questions

What is the warmest month in San Mateo?

August and September, with an average high-temperature of 71.2°F (21.8°C), are warmest months.

What are the temperatures in San Mateo in August?

The average high-temperature, in August, in San Mateo, is 71.2°F (21.8°C), while the average low-temperature is 56.3°F (13.5°C).

What are the most humid months in San Mateo?

The months with the highest humidity in San Mateo, California, are March and August, with an average relative humidity of 76%.

What is the average humidity in August in San Mateo?

The average relative humidity in August in San Mateo is 76%.

What is the driest month in San Mateo?

In San Mateo, rain does not fall in June through August.

Does it rain in San Mateo in August?

In San Mateo, California, in August, it doesn't rain. In September, it rains.

How many hours of daylight does San Mateo have in August?

In August, the average day length in San Mateo is 13h and 34min.

What time are sunrise and sunset in August in San Mateo?

In August, on the first day of the month, sunrise is at 6:14 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:39 pm PDT.

How long on average sun shines in August in San Mateo?

In August, the average sunshine duration in San Mateo is 11.8h.

What is the month with the highest UV index in San Mateo?

The months with the highest UV index are June through September, with an average maximum UV index of 5.

How high is the UV index in August in San Mateo?

In San Mateo, California, the average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
San Mateo, CA

Average temperature in August - San Mateo, CA
  • Average high temperature in August: 71.2°F

The warmest months (with the highest average high temperature) are August and September (71.2°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in August: 56.3°F

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).

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Average pressure in August
San Mateo, CA

Average pressure in August - San Mateo, CA
  • Average pressure in August: 29.93"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 August
San Mateo, CA

Average wind speed in August - San Mateo, CA
  • Average wind speed in August: 5.9mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.9mph).

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Average humidity in August
San Mateo, CA

Average humidity in August - San Mateo, CA
  • Average humidity in August: 76%

The months with the highest relative humidity are March and August (76%).
The months with the lowest relative humidity are October and November (70%).

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Average rainfall in August
San Mateo, CA

Average rainfall in August - San Mateo, CA
  • Average rainfall in August: 0"

The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and August (0").

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Average rainfall days in August
San Mateo, CA

Average rainfall days in August - San Mateo, CA
  • Average rainfall days in August: 0.7 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is July (0.3 days).

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Average daylight in August /
Average sunshine in August
San Mateo, CA

Average daylight in August / Average sunshine in August - San Mateo, CA
  • Average daylight in August: 13h and 4min

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 August: 11h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in August
San Mateo, CA

Average sunshine days in August - San Mateo, CA
  • Average sunshine days in August: 30.2 days

The month with the most sunshine days is July (30.4 days).
The month with the least sunshine days is February (23.3 days).

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Average UV index in August
San Mateo, CA

Average UV index in August - San Mateo, CA
  • Average UV index in August: 5

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).

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Average cloud cover in August
San Mateo, CA

Average cloud cover in August - San Mateo, CA
  • Average cloud cover in August: 13

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in August
San Mateo, CA

Average visibility in August - San Mateo, CA
  • Average visibility in August: 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 Mateo, California, USA

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