October weather forecast and climate
Hercules, CA

Weather in October

October, the same as September, in Hercules, California, is another pleasant autumn month, with average temperature fluctuating between 71.4°F (21.9°C) and 54.7°F (12.6°C).

Temperature

In Hercules, the average high-temperature in October slightly decreases, from a warm 77.5°F (25.3°C) in September, to a pleasant 71.4°F (21.9°C). In Hercules, the average low-temperature is 54.7°F (12.6°C).

Humidity

Months with the lowest humidity in Hercules are September and October, with an average relative humidity of 63%.

Rainfall

In Hercules, during October, the rain falls for 5.1 days and regularly aggregates up to 0.59" (15mm) of precipitation. In Hercules, during the entire year, the rain falls for 72.2 days and collects up to 12.83" (326mm) of precipitation.

Ocean temperature

In October, the average ocean temperature is 56.8°F (13.8°C).
Note: Swimming in 56.8°F (13.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in Hercules, California, is 11.2h.

Sunshine

In October, the average sunshine in Hercules, California, is 7h.

UV index

In October, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 4 in October transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in October in Hercules?

The average high-temperature, in October, in Hercules, is 71.4°F (21.9°C), while the average low-temperature is 54.7°F (12.6°C).

What are the least humid months in Hercules?

Months with the lowest humidity in Hercules are September and October, with an average relative humidity of 63%.

What is the average humidity in October in Hercules?

In Hercules, California, the average relative humidity in October is 63%.

How many days does it rain in October in Hercules?

In Hercules, in October, during 5.1 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.

How cold is the water in October in Hercules?

In Hercules, California, the average seawater temperature in October is 56.8°F (13.8°C). Swimming in 56.8°F (13.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in October in Hercules?

In October, the average length of the day in Hercules is 11.2h.

How many hours of sunshine does Hercules have in October?

In Hercules, California, the average sunshine in October is 7h.

How high is the UV index in October in Hercules?

In October, the average daily maximum UV index in Hercules is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in October
Hercules, CA

Average temperature in October - Hercules, CA
  • Average high temperature in October: 71.4°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 October: 54.7°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 October
Hercules, CA

Average pressure in October - Hercules, CA
  • Average pressure in October: 29.98"

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 October
Hercules, CA

Average wind speed in October - Hercules, CA
  • Average wind speed in October: 5.2mph

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 October
Hercules, CA

Average humidity in October - Hercules, CA
  • Average humidity in October: 63%

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 October
Hercules, CA

Average rainfall in October - Hercules, CA
  • Average rainfall in October: 0.59"

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 October
Hercules, CA

Average rainfall days in October - Hercules, CA
  • Average rainfall days in October: 5.1 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 October
Hercules, CA

Average sea temperature in October - Hercules, CA
  • Average sea temperature in October: 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 October /
Average sunshine in October
Hercules, CA

Average daylight in October / Average sunshine in October - Hercules, CA
  • Average daylight in October: 11.2h

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 October: 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 October
Hercules, CA

Average sunshine days in October - Hercules, CA
  • Average sunshine days in October: 24.4 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 October
Hercules, CA

Average UV index in October - Hercules, CA
  • Average UV index in October: 4

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 October
Hercules, CA

Average cloud cover in October - Hercules, CA
  • Average cloud cover in October: 18

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 October
Hercules, CA

Average visibility in October - Hercules, CA
  • Average visibility in October: 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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