September weather forecast
Los Angeles, CA

A beautiful view of the detailed layout of Los Angeles in California, USA
A beautiful view of the detailed layout of Los Angeles in California, USA

Weather in September

The first month of the autumn, September, is still a warm month in Los Angeles, California, with an average temperature ranging between max 82.2°F (27.9°C) and min 64.4°F (18°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still moderately hot 82.2°F (27.9°C). In Los Angeles, in September, the average low-temperature is 64.4°F (18°C).

Heat index

In September, the average heat index is computed to be 84.2°F (29°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, metabolic differences, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in September in Los Angeles, California, is 57%.

Rainfall

In Los Angeles, during 2.1 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, in Los Angeles, California, there are 44.6 rainfall days, and 8.11" (206mm) of precipitation is accumulated.

Daylight

In Los Angeles, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:26 am and sunset at 7:18 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:38 pm PDT.

Sunshine

In Los Angeles, the average sunshine in September is 10.7h.

UV index

The months with the highest UV index in Los Angeles are June through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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.
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FAQ

What is the temperature in September in Los Angeles?

The average high-temperature, in September, is 82.2°F (27.9°C), while the average low-temperature is 64.4°F (18°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is computed to be 84.2°F (29°C).

What is the average humidity in September in Los Angeles?

In Los Angeles, California, the average relative humidity in September is 57%.

How many days does it rain in September in Los Angeles?

In Los Angeles, California, during September, the rain falls for 2.1 days and regularly aggregates up to 0.12" (3mm) of precipitation.

What is the average length of the day in September in Los Angeles?

The average day length in September in Los Angeles is 12h and 22min.

What time are sunrise and sunset in September in Los Angeles?

On the first day of September in Los Angeles, sunrise is at 6:26 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:38 pm PDT.

How many hours of sunshine does Los Angeles have in September?

In September, the average sunshine duration in Los Angeles, California, is 10.7h.

What are the months with the highest UV index in Los Angeles?

The months with the highest UV index are June through September, with an average maximum UV index of 6.

How high is the UV index in September in Los Angeles?

The average daily maximum UV index in September in Los Angeles is 6. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.

Average temperature in September
Los Angeles, CA

Average temperature in September - Los Angeles, CA
  • Average high temperature in September: 82.2°F

The warmest month (with the highest average high temperature) is August (83.3°F).
The month with the lowest average high temperature is December (64°F).

  • Average low temperature in September: 64.4°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 (49.8°F).

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Average pressure in September
Los Angeles, CA

Average pressure in September - Los Angeles, CA
  • Average pressure in September: 29.89"

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

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Average wind speed in September
Los Angeles, CA

Average wind speed in September - Los Angeles, CA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is April (6.1mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).

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Average humidity in September
Los Angeles, CA

Average humidity in September - Los Angeles, CA
  • Average humidity in September: 57%

The month with the highest relative humidity is June (65%).
The month with the lowest relative humidity is November (50%).

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Average rainfall in September
Los Angeles, CA

Average rainfall in September - Los Angeles, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Los Angeles, CA

Average rainfall days in September - Los Angeles, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (6.9 days).
The month with the least rainy days is June (1 days).

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Average daylight in September /
Average sunshine in September
Los Angeles, CA

Average daylight in September / Average sunshine in September - Los Angeles, CA
  • Average daylight in September: 12h and 22min

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in September: 10.7h

The months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Los Angeles, CA

Average sunshine days in September - Los Angeles, CA
  • Average sunshine days in September: 26.8 days

The month with the most sunshine days is August (28.1 days).
The month with the least sunshine days is February (21.7 days).

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Average UV index in September
Los Angeles, CA

Average UV index in September - Los Angeles, CA
  • Average UV index in September: 6

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

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Average cloud cover in September
Los Angeles, CA

Average cloud cover in September - Los Angeles, CA
  • Average cloud cover in September: 9

The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in September
Los Angeles, CA

Average visibility in September - Los Angeles, 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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