June weather forecast
Port Costa, CA

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Weather in June

The first month of the summer, June, is a warm month in Port Costa, California, with an average temperature fluctuating between 54.1°F (12.3°C) and 77.7°F (25.4°C).

Temperature

The onset of June introduces a subtle rise in the average high-temperature, nudging from a pleasant 71.1°F (21.7°C) in May to a moderately hot 77.7°F (25.4°C). During June nights, Port Costa documents a marked contrast from daily highs, with an average temperature of 54.1°F (12.3°C).

Humidity

The average relative humidity in June in Port Costa is 62%.

Rainfall

In Port Costa, during June, the rain falls for 1.1 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Port Costa, during the entire year, the rain falls for 56.9 days and collects up to 4.88" (124mm) of precipitation.

Daylight

With an average of 14h and 48min of daylight, June has the longest days of the year in Port Costa, California.
On the first day of the month, sunrise is at 5:47 am and sunset at 8:26 pm. On the last day of June, in Port Costa, California, sunrise is at 5:49 am and sunset at 8:35 pm PDT.

Sunshine

The average sunshine in June is 11.7h.

UV index

The month with the highest UV index in Port Costa is June, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: A maximum high UV index of 6 in June translates into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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Frequently asked questions

What is the average June temperature in Port Costa?

In June, the average high-temperature and low-temperature are 77.7°F (25.4°C) and 54.1°F (12.3°C) respectively.

What is the average humidity in June in Port Costa?

The average relative humidity in June in Port Costa is 62%.

How many days does it rain in June in Port Costa?

In June, in Port Costa, California, the rain falls for 1.1 days. Throughout June, 0.08" (2mm) of precipitation is accumulated.

When are the longest days in Port Costa?

June has the longest days of the year in Port Costa, California, with an average of 14h and 48min of daylight.

What is the average length of the day in June in Port Costa?

In Port Costa, the average day length in June is 14h and 46min.

What time are sunrise and sunset in June in Port Costa?

On the first day of June in Port Costa, California, sunrise is at 5:47 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:35 pm PDT.

How many hours of sunshine does Port Costa have in June?

The average sunshine duration in June in Port Costa, California, is 11.7h.

What is the month with the highest UV index in Port Costa?

The month with the highest UV index in Port Costa, California, is June, with an average maximum UV index of 6.

How high is the UV index in June in Port Costa?

In June, the average daily maximum UV index in Port Costa, California, is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in June
Port Costa, CA

Average temperature in June - Port Costa, CA
  • Average high temperature in June: 77.7°F

The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in June: 54.1°F

The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).

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Average pressure in June
Port Costa, CA

Average pressure in June - Port Costa, CA
  • Average pressure in June: 29.91"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in June
Port Costa, CA

Average wind speed in June - Port Costa, CA
  • Average wind speed in June: 6.9mph

The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).

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Average humidity in June
Port Costa, CA

Average humidity in June - Port Costa, CA
  • Average humidity in June: 62%

The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (60%).

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Average rainfall in June
Port Costa, CA

Average rainfall in June - Port Costa, CA
  • Average rainfall in June: 0.08"

The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in June
Port Costa, CA

Average rainfall days in June - Port Costa, CA
  • Average rainfall days in June: 1.1 days

The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).

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Average daylight in June /
Average sunshine in June
Port Costa, CA

Average daylight in June / Average sunshine in June - Port Costa, CA
  • Average daylight in June: 14h and 5min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in June: 11h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in June
Port Costa, CA

Average sunshine days in June - Port Costa, CA
  • Average sunshine days in June: 26.7 days

The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).

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Average UV index in June
Port Costa, CA

Average UV index in June - Port Costa, CA
  • Average UV index in June: 6

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

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Average cloud cover in June
Port Costa, CA

Average cloud cover in June - Port Costa, CA
  • Average cloud cover in June: 14

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in June
Port Costa, CA

Average visibility in June - Port Costa, CA
  • Average visibility in June: 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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Port Costa, California, USA

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