September weather forecast
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

The first month of the autumn, September, is still a warm month in Newport Beach, California, with temperature in the range of an average low of 64.2°F (17.9°C) and an average high of 76.1°F (24.5°C).

Temperature

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

Humidity

In September, the average relative humidity is 68%.

Rainfall

In Newport Beach, it is raining for 3.3 days, with typically 0.16" (4mm) of accumulated precipitation. 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, the average water temperature is 66.7°F (19.3°C).
Note: For swimming, a surface water temperature of 66.7°F (19.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in September in Newport Beach, California, is 12h and 22min.
On the first day of September in Newport Beach, sunrise is at 6:25 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:37 pm PDT.

Sunshine

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

UV index

The months with the highest UV index are July through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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 average humidity in September in Newport Beach?

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

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

In Newport Beach, in September, it is raining for 3.3 days, with typically 0.16" (4mm) of accumulated precipitation.

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 swimming, a surface water temperature of 66.7°F (19.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

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

In September, the average day length is 12h and 22min.

What time are sunrise and sunset in September in Newport Beach?

In September, on the first day of the month, sunrise is at 6:25 am and sunset at 7:17 pm. On the last day of the month, in Newport Beach, California, sunrise is at 6:45 am and sunset at 6:37 pm PDT.

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

The average sunshine duration in September is 10.5h.

When is the highest UV index in Newport Beach?

The months with the highest UV index in Newport Beach are July through September, with an average maximum UV index of 6.

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

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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: 12h and 22min

The month with the longest days is June (Average daylight: 14h and 21min).
The month with the shortest days is December (Average daylight: 9h and 58min).

  • Average sunshine in September: 10h and 30min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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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

The months with the highest UV index are July, August and September (UV index 6).
The 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

The 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

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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