August weather forecast
San Luis Obispo, CA

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Beautiful blue water surrounded by scenic mountain ranges at the San Luis Obispo, California
Beautiful blue water surrounded by scenic mountain ranges at the San Luis Obispo, California

Weather in August

The last month of the summer, August, is also a moderately hot month in San Luis Obispo, California, with an average temperature varying between 80.2°F (26.8°C) and 59.5°F (15.3°C).

Temperature

San Luis Obispo experiences its highest temperatures in August, with an average peak of 80.2°F (26.8°C) and a low of 59.5°F (15.3°C).

Humidity

In August, the average relative humidity in San Luis Obispo is 61%.

Rainfall

The months with the least rainfall in San Luis Obispo are June and August Rain falls for 0.6 days and accumulates 0.04" (1mm) of rain.

Daylight

In August, the average length of the day in San Luis Obispo, California, is 13h and 26min.
On the first day of the month, sunrise is at 6:12 am and sunset at 8:05 pm. On the last day of August, in San Luis Obispo, sunrise is at 6:34 am and sunset at 7:30 pm PDT.

Sunshine

The months with the most sunshine are June through August, with an average of 12h of sunshine.

UV index

The months with the highest UV index are June and August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 6 during August leads to these advisories:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

What is the hottest time of year in San Luis Obispo?

August, having an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 59.5°F (15.3°C), is the warmest month in San Luis Obispo.

What are the temperatures in San Luis Obispo in August?

The average high-temperature and low-temperature during August are 80.2°F (26.8°C) and 59.5°F (15.3°C) respectively.

What is the average humidity in August in San Luis Obispo?

The average relative humidity in August is 61%.

What is the driest month in San Luis Obispo?

The months with the least rainfall are June and August Rain falls for 0.6 days and accumulates 0.04" (1mm) of rain.

How much does it rain in San Luis Obispo in August?

In San Luis Obispo, in August, during 0.6 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the average length of the day in August in San Luis Obispo?

In August, the average day length is 13h and 26min.

What time are sunrise and sunset in August in San Luis Obispo?

On the first day of August in San Luis Obispo, sunrise is at 6:12 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 7:30 pm PDT.

What are the months with the most sunshine in San Luis Obispo?

The months with the most sunshine in San Luis Obispo are June through August, with an average of 12h of sunshine.

How long on average sun shines in August in San Luis Obispo?

In San Luis Obispo, the average sunshine duration in August is 12h.

What is the month with the highest UV index in San Luis Obispo?

The months with the highest UV index in San Luis Obispo, California, are June and August, with an average maximum UV index of 6.

How high is the UV index in August in San Luis Obispo?

The average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high hazard to health 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 Luis Obispo, CA

Average temperature in August - San Luis Obispo, CA
  • Average high temperature in August: 80.2°F

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (60.3°F).

  • Average low temperature in August: 59.5°F

The month with the highest average low temperature is September (60.3°F).
The coldest month (with the lowest average low temperature) is February (45.7°F).

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Average pressure in August
San Luis Obispo, CA

Average pressure in August - San Luis Obispo, CA
  • Average pressure in August: 29.91"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

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Average wind speed in August
San Luis Obispo, CA

Average wind speed in August - San Luis Obispo, CA
  • Average wind speed in August: 5.3mph

The windiest months (with the highest average wind speed) are April and May (6.8mph).
The calmest months (with the lowest average wind speed) are August and September (5.3mph).

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Average humidity in August
San Luis Obispo, CA

Average humidity in August - San Luis Obispo, CA
  • Average humidity in August: 61%

The month with the highest relative humidity is March (69%).
The months with the lowest relative humidity are September and October (57%).

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Average rainfall in August
San Luis Obispo, CA

Average rainfall in August - San Luis Obispo, CA
  • Average rainfall in August: 0.04"

The wettest month (with the highest rainfall) is March (2.01").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in August
San Luis Obispo, CA

Average rainfall days in August - San Luis Obispo, CA
  • Average rainfall days in August: 0.6 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.6 days).

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Average daylight in August /
Average sunshine in August
San Luis Obispo, CA

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

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in August: 12h and 0min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are February and December (Average sunshine: 6h and 30min).

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Average sunshine days in August
San Luis Obispo, CA

Average sunshine days in August - San Luis Obispo, CA
  • Average sunshine days in August: 29.2 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is February (19.1 days).

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Average UV index in August
San Luis Obispo, CA

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

The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is February (UV index 3).

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Average cloud cover in August
San Luis Obispo, CA

Average cloud cover in August - San Luis Obispo, CA
  • Average cloud cover in August: 6

The month with the most cloud cover is March (Cloud cover 28).
The months with the least cloud cover are August and September (Cloud cover 6).

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Average visibility in August
San Luis Obispo, CA

Average visibility in August - San Luis Obispo, 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 Luis Obispo, California, USA

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