September weather forecast
Seal Beach, CA

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Weather in September

September, the first month of the autumn in Seal Beach, is still a warm month, with an average temperature ranging between max 77°F (25°C) and min 64.6°F (18.1°C).

Temperature

The commencement of September records an average high-temperature of a still moderately hot 77°F (25°C), barely varying from August's 77.4°F (25.2°C). The average temperature in Seal Beach, California, drops to a refreshing 64.6°F (18.1°C) during the night in the month of September.

Humidity

In Seal Beach, the average relative humidity in September is 67%.

Rainfall

In Seal Beach, in September, during 3 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. In Seal Beach, during the entire year, the rain falls for 57.8 days and collects up to 8.82" (224mm) of precipitation.

Ocean temperature

In September, the average ocean temperature is 66.7°F (19.3°C).
Note: Swimming in water of 66.7°F (19.3°C) is not enjoyable for the majority of individuals. Breathing control becomes increasingly challenging as the temperature dips from 69.8°F (21°C) to 59°F (15°C).

Daylight

In September, the average length of the day in Seal Beach is 12h and 22min.
On the first day of September in Seal Beach, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.

Sunshine

In Seal Beach, the average sunshine in September is 10.6h.

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index in Seal Beach. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: An average UV index of 6 in September transforms into this advice:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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Frequently asked questions

What are September temperatures in Seal Beach?

Seal Beach in September has an average high-temperature of 77°F (25°C) and an average low-temperature of 64.6°F (18.1°C).

What is the average humidity in September in Seal Beach?

In September, the average relative humidity in Seal Beach is 67%.

How much does it rain in Seal Beach in September?

In Seal Beach, California, in September, it is raining for 3 days, with typically 0.2" (5mm) of accumulated precipitation.

What is the ocean temperature in September in Seal Beach?

In Seal Beach, the average seawater temperature in September 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 Seal Beach have in September?

In Seal Beach, California, the average day length in September is 12h and 22min.

When are sunrise and sunset in September in Seal Beach?

In September, on the first day of the month, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, in Seal Beach, sunrise is at 6:46 am and sunset at 6:37 pm PDT.

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

The average sunshine duration in September in Seal Beach is 10.6h.

What is the month with the highest UV index in Seal Beach?

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

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

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe 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 September
Seal Beach, CA

Average temperature in September - Seal Beach, CA
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (62.8°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is August (65.3°F).
The coldest month (with the lowest average low temperature) is February (52.7°F).

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Average pressure in September
Seal Beach, CA

Average pressure in September - Seal 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
Seal Beach, CA

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

The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.3mph).

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Average humidity in September
Seal Beach, CA

Average humidity in September - Seal Beach, CA
  • Average humidity in September: 67%

The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (57%).

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Average rainfall in September
Seal Beach, CA

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

The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Seal Beach, CA

Average rainfall days in September - Seal Beach, CA
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is March (8.1 days).
The months with the least rainy days are June and August (2.3 days).

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Average sea temperature in September
Seal Beach, CA

Average sea temperature in September - Seal Beach, CA
  • Average sea temperature in September: 66.7°F

The best months for swimming (with the highest average sea temperature) are July and August (67.9°F).
The coldest month (with the lowest average sea temperature) is January (58.3°F).

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

Average daylight in September / Average sunshine in September - Seal Beach, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 4min

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 42min).

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Average sunshine days in September
Seal Beach, CA

Average sunshine days in September - Seal Beach, CA
  • Average sunshine days in September: 25.5 days

The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is February (19.3 days).

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Average UV index in September
Seal Beach, CA

Average UV index in September - Seal 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
Seal Beach, CA

Average cloud cover in September - Seal Beach, CA
  • Average cloud cover in September: 10

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in September
Seal Beach, CA

Average visibility in September - Seal 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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Seal Beach, California, USA

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