August weather forecast
San Marino, CA

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Weather in August

August, the last month of the summer in San Marino, is a hot month, with an average temperature fluctuating between 87.1°F (30.6°C) and 64.8°F (18.2°C).

Temperature

With average temperatures fluctuating between a high of 87.1°F (30.6°C) and a low of 64.8°F (18.2°C), August stands out as the warmest month.

Heat index

During August, the heat index is evaluated at a hot 89.6°F (32°C). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.

Humidity

The average relative humidity in August in San Marino is 51%.

Rainfall

In San Marino, California, in August, during 2.3 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. In San Marino, during the entire year, the rain falls for 45 days and collects up to 6.61" (168mm) of precipitation.

Daylight

The average length of the day in August in San Marino is 13h and 23min.
On the first day of August, sunrise is at 6:04 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:19 pm PDT.

Sunshine

In August, the average sunshine in San Marino is 12h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 6 during August translates into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Updated: Feb 9, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What part of the year is the hottest in San Marino?

August, recognised by an average high temperature of 87.1°F (30.6°C) and a low of 64.8°F (18.2°C), is San Marino's warmest month.

How hot is it in San Marino in August?

In San Marino, in August, the average high-temperature is 87.1°F (30.6°C), and the average low-temperature is 64.8°F (18.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 89.6°F (32°C).

What is the average humidity in August in San Marino?

The average relative humidity in August in San Marino is 51%.

How much does it rain in San Marino in August?

In August, in San Marino, the rain falls for 2.3 days. Throughout August, 0.12" (3mm) of precipitation is accumulated.

What is the average length of the day in August in San Marino?

The average day length in August in San Marino, California, is 13h and 23min.

When are sunrise and sunset in August in San Marino?

In August, on the first day of the month, sunrise is at 6:04 am and sunset at 7:53 pm. On the last day of the month, in San Marino, sunrise is at 6:25 am and sunset at 7:19 pm PDT.

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

In August, the average sunshine duration in San Marino, California, is 12h.

What are the months with the highest UV index in San Marino?

The months with the highest UV index in San Marino, California, are June through September, with an average maximum UV index of 6.

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

In San Marino, California, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
San Marino, CA

Average temperature in August - San Marino, CA
  • Average high temperature in August: 87.1°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (63.1°F).

  • Average low temperature in August: 64.8°F

The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is February (47.1°F).

Average pressure in August
San Marino, CA

Average pressure in August - San Marino, CA
  • Average pressure in August: 29.89"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in August
San Marino, CA

Average wind speed in August - San Marino, CA
  • Average wind speed in August: 4.5mph

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

Average humidity in August
San Marino, CA

Average humidity in August - San Marino, CA
  • Average humidity in August: 51%

The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).

Average rainfall in August
San Marino, CA

Average rainfall in August - San Marino, CA
  • Average rainfall in August: 0.12"

The wettest month (with the highest rainfall) is December (1.34").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in August
San Marino, CA

Average rainfall days in August - San Marino, CA
  • Average rainfall days in August: 2.3 days

The month with the highest number of rainy days is March (5.8 days).
The month with the least rainy days is June (1.2 days).

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

Average daylight in August / Average sunshine in August - San Marino, CA
  • Average daylight in August: 13h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in August: 12h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).

Average sunshine days in August
San Marino, CA

Average sunshine days in August - San Marino, CA
  • Average sunshine days in August: 26.3 days

The month with the most sunshine days is June (27.1 days).
The month with the least sunshine days is February (22.3 days).

Average UV index in August
San Marino, CA

Average UV index in August - San Marino, CA
  • Average UV index in August: 6

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).

Average cloud cover in August
San Marino, CA

Average cloud cover in August - San Marino, CA
  • Average cloud cover in August: 5

The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in August
San Marino, CA

Average visibility in August - San Marino, 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).

San Marino, California, USA

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