Los Angeles weather in September
In September, Los Angeles has an average high of 31 °C88 °F and an average low of 19 °C66 °F, with about 3 mm0.1 in of precipitation. It is the 3rd warmest month of the year and ranks 9th for precipitation.
How September compares with other months
Compared with August, September is 0.8 °C1.5 °F cooler on average. Compared with October, September is 3.6 °C6.4 °F warmer on average and drier by 13 mm0.5 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 50% and the average cloud amount 17%.
Is September a good time to visit Los Angeles?
September is not among the most comfortable months by our comfort score: it is hot (average high 31 °C88 °F). The most comfortable months in Los Angeles are October–June.
What to wear in September
For Los Angeles in September, pack very light, breathable clothing, a sun hat and plenty of water.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Los Angeles | 3188 | 1966 | 30.1 |
| West Covina | 3188 | 1966 | 30.1 |
| Long Beach | 3289 | 1967 | 30.1 |
| Anaheim | 3189 | 1966 | 30.1 |
| Santa Clarita | 3494 | 1864 | 30.1 |
| Santa Ana | 2373 | 1966 | 30.1 |
| Thousand Oaks | 2678 | 1763 | 30.1 |
| Lancaster | 3391 | 1660 | 30.1 |
| Riverside | 3494 | 1966 | 40.2 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Santa Clarita and Riverside; cooler: Santa Ana and Thousand Oaks.
Other months in Los Angeles
- January19 °C67 °F / 9 °C48 °F
- February19 °C67 °F / 9 °C48 °F
- March21 °C70 °F / 10 °C50 °F
- April23 °C73 °F / 11 °C52 °F
- May25 °C78 °F / 14 °C57 °F
- June29 °C83 °F / 16 °C61 °F
- July31 °C89 °F / 19 °C67 °F
- August32 °C90 °F / 20 °C67 °F
- September31 °C88 °F / 19 °C66 °F
- October27 °C81 °F / 16 °C60 °F
- November23 °C73 °F / 12 °C54 °F
- December19 °C66 °F / 9 °C48 °F
Frequently asked questions
How warm is Los Angeles in September?
In September the average high in Los Angeles is 31 °C (88 °F) and the average low is 19 °C (66 °F).
Does it rain a lot in Los Angeles in September?
On average about 3 mm (0.1 in) of precipitation falls in September; it ranks 9th of the 12 months.
Is September the warmest month in Los Angeles?
No. The warmest month in Los Angeles is August, with an average high of 32 °C (90 °F). The coldest month is December, with an average low of 9 °C (48 °F).
How long is the day in Los Angeles in September?
In the middle of September the day in Los Angeles lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Los Angeles in September?
The average relative humidity in September is about 50%. This is a long-term average for the whole day.
How cloudy is Los Angeles in September?
On average about 17% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 395 m, while Los Angeles lies at about 89 m. Temperatures on this page were therefore adjusted by +2 °C3.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.