July weather forecastPort Costa, CA

July

Weather in July

July, the same as June, is another warm summer month in Port Costa, California, with an average temperature ranging between min 55.4°F (13°C) and max 80.1°F (26.7°C).

Temperature

In Port Costa, the months of July and September register the highest average temperatures, peaking at 80.1°F (26.7°C).

Humidity

In Port Costa, the average relative humidity in July is 63%.

Rainfall

The months with the least rainfall are July and August Rain falls for 1.5 days and accumulates 0.04" (1mm) of rain.

Daylight

In July, the average length of the day is 14h and 30min.
On the first day of the month, sunrise is at 5:50 am and sunset at 8:35 pm. On the last day of July, sunrise is at 6:11 am and sunset at 8:18 pm PDT.

Sunshine

With an average of 12h of sunshine, July has the most sunshine of the year.

UV index

The average daily maximum UV index in July is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 5 in July translates into this advice:
Take necessary precautions - Suggestions to elude sunburn are provided. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

July and September, with an average high-temperature of 80.1°F (26.7°C), are warmest months in Port Costa.

During July, Port Costa experiences an average high-temperature of 80.1°F (26.7°C) and a low-temperature of 55.4°F (13°C).

The average relative humidity in July is 63%.

July and August are months with the least rain when the rain falls for 1.5 days and typically aggregates up to 0.04" (1mm) of rain.

In Port Costa, California, in July, during 1.5 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

In July, the average day length is 14h and 30min.

On the first day of July, sunrise is at 5:50 am and sunset at 8:35 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 8:18 pm PDT.

July has the most sunshine of the year, with an average of 12h of sunshine.

In Port Costa, California, the average sunshine duration in July is 12h.

The average daily maximum UV index in July is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J July A S O N D

Jun

July

Aug

Average high temperature

77.7°F

80.1°F

79.7°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.6mph

7.1mph

6.8mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

26.7

27.2

25.8

Average UV index

Average cloud cover

14%

11%

Average visibility

6mi

Average temperature in July
Port Costa, CA

Average high temperature in July: 80.1°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 July: 55.4°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).

Average pressure in July
Port Costa, CA

Average pressure in July: 29.93"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).

Average wind speed in July
Port Costa, CA

Average wind speed in July: 6.6mph

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).

Average humidity in July
Port Costa, CA

Average humidity in July: 63%

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

Average rainfall in July
Port Costa, CA

Average rainfall in July: 0.04"

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

Average rainfall days in July
Port Costa, CA

Average rainfall days in July: 1.5 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).

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

Average daylight in July: 14h and 30min

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 July: 12h and 0min

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).

Average sunshine days in July
Port Costa, CA

Average sunshine days in July: 27.2 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).

Average UV index in July
Port Costa, CA

Average UV index in July: 5

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).

Average cloud cover in July
Port Costa, CA

Average cloud cover in July: 9

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

Average visibility in July
Port Costa, CA

Average visibility in July: 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).