August weather forecast
Sunnyvale, CA

The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California
The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California

Weather in August

The last month of the summer, August, is another warm month in Sunnyvale, California, with temperature in the range of an average high of 79.3°F (26.3°C) and an average low of 56.8°F (13.8°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still warm 79.3°F (26.3°C). In August, in Sunnyvale, the average low-temperature is 56.8°F (13.8°C).

Humidity

In August, the average relative humidity in Sunnyvale is 66%.

Rainfall

January through June, August through December are months with rainfall. August is the first month it rains. Throughout August, in the average 0.4 rainfall days, it receives 0.04" (1mm) of precipitation. In Sunnyvale, during the entire year, the rain falls for 50 days and collects up to 3.9" (99mm) of precipitation.

Daylight

In Sunnyvale, the average length of the day in August is 13h and 33min.
On the first day of August, sunrise is at 6:12 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 7:38 pm PDT.

Sunshine

In Sunnyvale, California, the average sunshine in August is 12h.

UV index

The average daily maximum UV index in August in Sunnyvale is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in August interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in August in Sunnyvale?

The average relative humidity in August in Sunnyvale is 66%.

When does it start to rain in Sunnyvale?

August is the first month it rains in Sunnyvale, California. Throughout August, in the average 0.4 rainfall days, it receives 0.04" (1mm) of precipitation.

What is the average length of the day in August in Sunnyvale?

In August, the average day length is 13h and 33min.

When is the sunrise / sunset in August in Sunnyvale?

In August, on the first day of the month, sunrise is at 6:12 am and sunset at 8:16 pm. On the last day of the month, in Sunnyvale, sunrise is at 6:38 am and sunset at 7:38 pm PDT.

How long on average sun shines in August in Sunnyvale?

In August, the average sunshine duration is 12h.

What is the UV index reading in August in Sunnyvale?

In August, the average daily maximum UV index in Sunnyvale, California, is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in August
Sunnyvale, CA

Average temperature in August - Sunnyvale, CA
  • Average high temperature in August: 79.3°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is December (56.8°F).

  • Average low temperature in August: 56.8°F

The month with the highest average low temperature is August (56.8°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure in August
Sunnyvale, CA

Average pressure in August - Sunnyvale, CA
  • Average pressure in August: 29.93"

The month with the highest atmospheric pressure is January (30.13").
The months with the lowest atmospheric pressure are June and September (29.92").

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Average wind speed in August
Sunnyvale, CA

Average wind speed in August - Sunnyvale, CA
  • Average wind speed in August: 4.7mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.6mph).

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Average humidity in August
Sunnyvale, CA

Average humidity in August - Sunnyvale, CA
  • Average humidity in August: 66%

The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are September and October (63%).

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Average rainfall in August
Sunnyvale, CA

Average rainfall in August - Sunnyvale, CA
  • Average rainfall in August: 0.04"

The wettest months (with the highest rainfall) are February and March (0.75").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in August
Sunnyvale, CA

Average rainfall days in August - Sunnyvale, CA
  • Average rainfall days in August: 0.4 days

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.4 days).

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Average daylight in August /
Average sunshine in August
Sunnyvale, CA

Average daylight in August / Average sunshine in August - Sunnyvale, CA
  • Average daylight in August: 13h and 33min

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 38min).

  • Average sunshine in August: 12h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in August
Sunnyvale, CA

Average sunshine days in August - Sunnyvale, CA
  • Average sunshine days in August: 30.1 days

The month with the most sunshine days is August (30.1 days).
The month with the least sunshine days is March (19.9 days).

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Average UV index in August
Sunnyvale, CA

Average UV index in August - Sunnyvale, CA
  • Average UV index in August: 5

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

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Average cloud cover in August
Sunnyvale, CA

Average cloud cover in August - Sunnyvale, CA
  • Average cloud cover in August: 8

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in August
Sunnyvale, CA

Average visibility in August - Sunnyvale, 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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