Weather in Los Angeles in September 2025
Average weather
Average temperature in Los Angeles in September
Going from a maximum of +33°C during the day to a minimum of +15°C during the night, the temperature in September averages around +26°C.
The average maximum temperature goes down 39% by the end of the month, compared with the beginning of the month, from +29°C to +22°C.
Is Los Angeles warm or cold in September?
Los Angeles is typically hot in September.
Maximum temperatures go down compared to the previous month from +33°C to +31°C. The minimum temperature also goes down from +20°C to +19°C.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
September is one of the warmest months in Los Angeles, here is the comparison with other months:
Water temperature in Los Angeles in September
Water in Los Angeles in September is Fresh. It varies from +17°C to +21°C, with an average of +19°C. The air temperature averaging +31°C is higher than the water temperature.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Los Angeles in September?
Climate in Los Angeles in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +33°C | +31°C | +28°C | ||||
| Min. temperature | ||||||
| +15°C | +12°C | +8°C | ||||
| Max. temperature | ||||||
| +43°C | +44°C | +42°C | ||||
| Rainfall | ||||||
| 4 mm | 5 mm | 15 mm | ||||
| Wind | ||||||
| 0 m/s | 0 m/s | 0 m/s | ||||
| Avg. water temperature | ||||||
| +20°C | +19°C | +18°C | ||||
| Humidity | ||||||
| 65% | 65% | 63% | ||||
| Air pressure | ||||||
| 1011 HPa | 1011 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 22 | 19 | 17 | ||||
| Cloudy days | ||||||
| 8 | 8 | 10 | ||||
| Rainy days | ||||||
| 1 | 2 | 4 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as great as in August. It’s getting colder in September. From +33°C in the day, the average maximum temperature lowers to +31°C. Prepare for more rain. Average rainfall goes from 4 mm to 5 mm. Humidity levels don’t change as the month goes on, averaging around 65%. The average wind speed doesn’t change much during September, staying around 0 m/s. The days becoming less sunny, going from 22 sunny days in August to 19 in September.
October brings much the same weather, it remains great.
Wind
The average wind speed is 1 m/s getting up to 1 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Los Angeles is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Los Angeles?
Climate Change over Years
The climate in Los Angeles in September has not changed much over the last 43 years.
The average temperature was the lowest in 2023 (+23°C) and the highest in 2015 (+27°C). The driest year was 2007 with only 120 mm of rainfall, and the wettest year was 2023 with 998 mm.
FAQ
Is September a good time to visit Los Angeles?
Can you sunbathe in Los Angeles in September?
Can you swim in Los Angeles in September?
Is Los Angeles rainy in September?
Is it sunny in Los Angeles in September?
Other cities in USA
Monthly weather in Los Angeles
Source of the data
For this page, we’ve looked at the typical weather in Los Angeles, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.