August weather forecast and climate
Hercules, CA

Weather in August

August, the last month of the summer, in Hercules, is another warm month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 56.8°F (13.8°C).

Temperature

In August, the average high-temperature remains the same as in July - a still moderately hot 76.6°F (24.8°C). In August, in Hercules, the average low-temperature is 56.8°F (13.8°C).

Humidity

In Hercules, California, the average relative humidity in August is 69%.

Rainfall

July and August are months with the least rain in Hercules, California, when the rain falls for 1.1 days and typically aggregates up to 0.04" (1mm) of rain.

Ocean temperature

In Hercules, in August, the average water temperature is 56.8°F (13.8°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in Hercules is 13.6h.

Sunshine

In Hercules, the average sunshine is 11.7h.

UV index

April through September, with an average maximum UV index of 5, are months with the highest UV index in Hercules. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: In August, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for 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 temperature in August in Hercules?

The average high-temperature, in August, in Hercules, California, is 76.6°F (24.8°C), while the average low-temperature is 56.8°F (13.8°C).

What is the average humidity in August in Hercules?

In August, the average relative humidity in Hercules, California, is 69%.

How much does it rain in Hercules in August?

In Hercules, California, in August, during 1.1 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the driest month in Hercules?

July and August are months with the least rain in Hercules, California, when the rain falls for 1.1 days and typically aggregates up to 0.04" (1mm) of rain.

How cold is the water in August in Hercules?

In August, the average ocean temperature is 56.8°F (13.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does Hercules have in August?

The average length of the day in August in Hercules is 13.6h.

How long on average sun shines in August in Hercules?

In Hercules, the average sunshine in August is 11.7h.

What is the month with the highest UV index in Hercules?

April through September, with an average maximum UV index of 5, are months with the highest UV index in Hercules.

What is the UV index reading in August in Hercules?

In Hercules, California, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in August
Hercules, CA

Average temperature in August - Hercules, CA
  • Average high temperature in August: 76.6°F

The warmest month (with the highest average high temperature) is September (77.5°F).
The month with the lowest average high temperature is December (55.4°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 January and December (43.9°F).

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Average pressure in August
Hercules, CA

Average pressure in August - Hercules, CA
  • Average pressure in August: 29.92"

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

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Average wind speed in August
Hercules, CA

Average wind speed in August - Hercules, CA
  • Average wind speed in August: 6.4mph

The windiest month (with the highest average wind speed) is May (7.5mph).
The calmest month (with the lowest average wind speed) is November (4.8mph).

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Average humidity in August
Hercules, CA

Average humidity in August - Hercules, CA
  • Average humidity in August: 69%

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are September and October (63%).

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Average rainfall in August
Hercules, CA

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

The wettest month (with the highest rainfall) is February (2.76").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in August
Hercules, CA

Average rainfall days in August - Hercules, CA
  • Average rainfall days in August: 1.1 days

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (1.1 days).

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Average sea temperature in August
Hercules, CA

Average sea temperature in August - Hercules, CA
  • Average sea temperature in August: 56.8°F

The best month for swimming (with the highest average sea temperature) is September (57°F).
The coldest month (with the lowest average sea temperature) is April (52.6°F).

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

Average daylight in August / Average sunshine in August - Hercules, CA
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in August: 11.7h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in August
Hercules, CA

Average sunshine days in August - Hercules, CA
  • Average sunshine days in August: 27.3 days

The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is March (16.4 days).

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Average UV index in August
Hercules, CA

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

Months with the highest UV index are April, May, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in August
Hercules, CA

Average cloud cover in August - Hercules, CA
  • Average cloud cover in August: 15

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 12).

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Average visibility in August
Hercules, CA

Average visibility in August - Hercules, CA
  • Average visibility in August: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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