September weather forecast and climate
Newport Beach, CA

The stunning coastal village of Corona Del Mar, in Newport Beach, California
The stunning coastal village of Corona Del Mar, in Newport Beach, California

Weather in September

September, the first month of the autumn, in Newport Beach, is still a warm month, with average temperature ranging between max 76.1°F (24.5°C) and min 64.2°F (17.9°C).

Temperature

In Newport Beach, the average high-temperature is essentially the same as in August - a still warm 76.1°F (24.5°C). The average low-temperature, in Newport Beach, California, is 64.2°F (17.9°C).

Humidity

In Newport Beach, the average relative humidity in September is 68%.

Rainfall

In September, the rain falls for 3.3 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. In Newport Beach, during the entire year, the rain falls for 50.7 days and collects up to 3.74" (95mm) of precipitation.

Ocean temperature

In Newport Beach, in September, the average water temperature is 66.7°F (19.3°C).
Note: 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).

Daylight

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

Sunshine

In Newport Beach, California, the average sunshine in September is 10.5h.

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index in Newport Beach. A UV Index of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Newport Beach?

The average high-temperature, in September, in Newport Beach, California, is 76.1°F (24.5°C), while the average low-temperature is 64.2°F (17.9°C).

What is the average humidity in September in Newport Beach?

In September, the average relative humidity is 68%.

How much does it rain in Newport Beach in September?

In September, in Newport Beach, California, the rain falls for 3.3 days. Throughout September, 0.16" (4mm) of precipitation is accumulated.

What is the ocean temperature in September in Newport Beach?

In Newport Beach, the average seawater temperature in September 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).

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

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

How long on average sun shines in September in Newport Beach?

In Newport Beach, California, the average sunshine in September is 10.5h.

When is the highest UV index in Newport Beach?

Months with the highest UV index are July through September, with an average maximum UV index of 6.

How high is the UV index in September in Newport Beach?

In September, the average daily maximum UV index in Newport Beach is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Newport Beach, CA

Average temperature in September - Newport Beach, CA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 64.2°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (52.3°F).

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Average pressure in September
Newport Beach, CA

Average pressure in September - Newport Beach, CA
  • Average pressure in September: 29.89"

The month with the highest atmospheric pressure is January (30.1").
Months with the lowest atmospheric pressure are June and September (29.89").

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Average wind speed in September
Newport Beach, CA

Average wind speed in September - Newport Beach, CA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).

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Average humidity in September
Newport Beach, CA

Average humidity in September - Newport Beach, CA
  • Average humidity in September: 68%

The month with the highest relative humidity is June (74%).
The month with the lowest relative humidity is November (59%).

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Average rainfall in September
Newport Beach, CA

Average rainfall in September - Newport Beach, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is December (0.79").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Newport Beach, CA

Average rainfall days in September - Newport Beach, CA
  • Average rainfall days in September: 3.3 days

The month with the highest number of rainy days is March (6.6 days).
The month with the least rainy days is June (1.6 days).

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Average sea temperature in September
Newport Beach, CA

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

The 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).

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Average daylight in September /
Average sunshine in September
Newport Beach, CA

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 the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 10.5h

The month with the most sunshine is August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.6h).

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Average sunshine days in September
Newport Beach, CA

Average sunshine days in September - Newport Beach, CA
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is June (26.5 days).
The month with the least sunshine days is February (20.5 days).

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Average UV index in September
Newport Beach, CA

Average UV index in September - Newport Beach, CA
  • Average UV index in September: 6

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in September
Newport Beach, CA

Average cloud cover in September - Newport Beach, CA
  • Average cloud cover in September: 11

Months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in September
Newport Beach, CA

Average visibility in September - Newport Beach, CA
  • Average visibility in September: 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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