Newport Beach
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Newport Beach, CA

A bird
A bird's eye view of the stunning coastal village of Corona Del Mar, in Newport Beach, California, with cruise boats on the clear blue waters and beaches around the village
The first month of the autumn, September, is still a pleasant month in Newport Beach, California, with temperature in the range of an average high of 72°F (22.2°C) and an average low of 63.7°F (17.6°C).

Temperature

In Newport Beach, the average high-temperature in September is almost the same as in August - a still pleasant 72°F (22.2°C). The average low-temperature, in Newport Beach, is 63.7°F (17.6°C).

Rainfall

In Newport Beach, during 1 rainfall days, 0.2" (4.3mm) of precipitation is typically accumulated. In Newport Beach, during the entire year, the rain falls for 32 days and collects up to 10.6" (269.8mm) of precipitation.

Ocean temperature

In September, the average ocean temperature is 66.7°F (19.3°C). For most, swimming in 66.7°F (19.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

In September, the average length of the day in Newport Beach is 12.4h.

Sunshine

In September, the average sunshine in Newport Beach is 9h.

UV index

The average daily maximum UV index in Newport Beach, California, is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
In September, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Newport Beach?

The average high-temperature, in September, in Newport Beach, is 72°F (22.2°C), while the average low-temperature is 63.7°F (17.6°C).

How many days does it rain in September in Newport Beach?

In Newport Beach, in September, during 1 rainfall days, 0.2" (4.3mm) of precipitation is typically accumulated.

How cold is the water in September in Newport Beach?

In September, the average ocean temperature is 66.7°F (19.3°C). Swimming in 66.7°F (19.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Newport Beach have in September?

The average length of the day in September in Newport Beach is 12.4h.

How many hours of sunshine does Newport Beach have in September?

In September, the average sunshine is 9h.

What is the UV index reading in September in Newport Beach?

In Newport Beach, California, the average daily maximum UV index in September is 8. A UV Index value of 8 to 10 symbolizes a very high health threat from the exposure to the Sun's UV rays.
Average temperature in September - Newport Beach, CA
  • Average high temperature in September: 72°F

The warmest month (with the highest average high temperature) is August (72.2°F).
The month with the lowest average high temperature is March (62.7°F).

  • Average low temperature in September: 63.6°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (49.3°F).

Average rainfall in September - Newport Beach, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is February (2.6").
Driest months (with the lowest rainfall) are July and August (0").

Average rainfall days in September - Newport Beach, CA
  • Average rainfall days in September: 1 days

The month with the highest number of rainy days is March (6 days).
Months with the lowest number of rainy days are June, July and August (0 days).

Average sea temperature in September - Newport Beach, CA
  • Average sea temperature in September: 66.8°F

Best months for swimming (with the highest average sea temperature) are July and August (67.7°F).
The coldest month (with the lowest average sea temperature) is January (58.5°F).

Average daylight in September / Average sunshine in September - Newport Beach, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9h

Months with most sunshine are July and August (Average sunshine: 11h).
Months with least sunshine are January, November and December (Average sunshine: 7).

Average UV index in September - Newport Beach, CA
  • Average UV index in September: 8

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).