September weather forecast and climate
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
September, the first month of the autumn, in Los Angeles, is also a moderately hot month, with average temperature varying between 64.4°F (18°C) and 82.2°F (27.9°C).

Temperature

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

Heat index

In September, the average heat index is calculated to 84.2°F (29°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, wind), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

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

Rainfall

In Los Angeles, during September, the rain falls for 2.1 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Los Angeles, during the entire year, the rain falls for 44.6 days and collects up to 8.11" (206mm) of precipitation.

Daylight

In Los Angeles, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 10.7h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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.

What is the temperature in September in Los Angeles?

In Los Angeles, California, in September, the average high-temperature is 82.2°F (27.9°C), and the average low-temperature is 64.4°F (18°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that takes the relative humidity and factores it into the air temperature reading, in September is calculated to 84.2°F (29°C).

What is the average humidity in September in Los Angeles?

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

How much does it rain in Los Angeles in September?

In Los Angeles, California, in September, it is raining for 2.1 days, with typically 0.12" (3mm) of accumulated precipitation.

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

In Los Angeles, California, the average length of the day in September is 12.4h.

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

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

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

Months with the highest UV index in Los Angeles, California, are June through September, with an average maximum UV index of 6.

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

In September, the average daily maximum UV index in Los Angeles is 6. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV rays.
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).

Average pressure in September - Los Angeles, 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").

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).

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%).

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").

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).

Average daylight in September / Average sunshine in September - Los Angeles, 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: 9.9h).

  • Average sunshine in September: 10.7h

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

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).

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

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

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

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).

Average visibility in September - Los Angeles, 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).