June weather forecast and climate
Hercules, CA

Weather in June

The first month of the summer, June, is a warm month in Hercules, California, with average temperature fluctuating between 74.8°F (23.8°C) and 54.3°F (12.4°C).

Temperature

In Hercules, the average high-temperature in June marginally rises, from a pleasant 69.3°F (20.7°C) in May, to a moderately hot 74.8°F (23.8°C). In June, in Hercules, California, the average low-temperature is 54.3°F (12.4°C).

Humidity

The average relative humidity is 65%.

Rainfall

In Hercules, during June, the rain falls for 2 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, there are 72.2 rainfall days, and 12.83" (326mm) of precipitation is accumulated.

Ocean temperature

In Hercules, California, the average seawater temperature is 52.9°F (11.6°C).
Note: Swimming in 52.9°F (11.6°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

June has the longest days of the year in Hercules, California, with an average of 14.8h of daylight.

Sunshine

In June, the average sunshine is 11.6h.

UV index

April through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the 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. 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 June in Hercules?

The average high-temperature, in June, in Hercules, is 74.8°F (23.8°C), while the average low-temperature is 54.3°F (12.4°C).

What is the average humidity in June in Hercules?

In Hercules, the average relative humidity in June is 65%.

How many days does it rain in June in Hercules?

In Hercules, California, in June, during 2 rainfall days, 0.16" (4mm) of precipitation is typically accumulated.

What is the water temperature in June in Hercules?

In Hercules, in June, the average water temperature is 52.9°F (11.6°C). Swimming in 52.9°F (11.6°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

When are the longest days in Hercules?

The month with the longest days in Hercules, California, is June, with an average of 14.8h of daylight.

How many hours of daylight does Hercules have in June?

The average length of the day in June is 14.8h.

How long on average sun shines in June in Hercules?

The average sunshine in June in Hercules, California, is 11.6h.

What are the months with the highest UV index in Hercules?

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

What is the UV index intensity in June in Hercules?

In Hercules, California, the average daily maximum UV index in June is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in June
Hercules, CA

Average temperature in June - Hercules, CA
  • Average high temperature in June: 74.8°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 June: 54.3°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 June
Hercules, CA

Average pressure in June - Hercules, CA
  • Average pressure in June: 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 June
Hercules, CA

Average wind speed in June - Hercules, CA
  • Average wind speed in June: 7.2mph

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 June
Hercules, CA

Average humidity in June - Hercules, CA
  • Average humidity in June: 65%

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 June
Hercules, CA

Average rainfall in June - Hercules, CA
  • Average rainfall in June: 0.16"

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 June
Hercules, CA

Average rainfall days in June - Hercules, CA
  • Average rainfall days in June: 2 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 June
Hercules, CA

Average sea temperature in June - Hercules, CA
  • Average sea temperature in June: 52.9°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 June /
Average sunshine in June
Hercules, CA

Average daylight in June / Average sunshine in June - Hercules, CA
  • Average daylight in June: 14.8h

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 June: 11.6h

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 June
Hercules, CA

Average sunshine days in June - Hercules, CA
  • Average sunshine days in June: 25.8 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 June
Hercules, CA

Average UV index in June - Hercules, CA
  • Average UV index in June: 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 June
Hercules, CA

Average cloud cover in June - Hercules, CA
  • Average cloud cover in June: 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 June
Hercules, CA

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