United States Los Angeles Weather in September — Climate Guide
September in Los Angeles is Excellent
September is Excellent for Los Angeles.
September is the value transition month. School-out crowds end Labor Day weekend (first Monday September), and hotel prices start declining 15-25% from August peak by mid-September. Weather remains dry-season peak — 30°C days, sea at 20°C.
LA Marathon (alternating March + September with location/season swap) draws 25,000+ runners through the city. The Stadium-to-Sea route (Dodger Stadium → Santa Monica Pier) is the canonical course.
Travel score
Los Angeles September Weather Stats
Avg High
30°C
Avg Low
17°C
Rainy Days
1
6mm total
Sunshine
10.5h
Daily avg
Humidity
65%
Comfortable
UV Index
10
Very high
Wind
13 km/h
Gusts 26
Sea Temp
20°C
Avg water temp
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
38 μg/m³
PM10
76 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
32°C
Nighttime
17°C
Humidity and wind affect how the actual temperature feels.
Wind
13 km/h
Max gust 26 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Hotel prices declining 15-25% from peak
- School-out crowds gone
- Continued dry-season weather
Cons
- Late September first marine layer drift
- Still warm + smog season
- Hot inland (Valley + Downtown)
September Events & Festivals
- LA Marathon — late September Sunday (or March, biennial)
- School-out crowds end Labor Day weekend (early September)
- Hotel prices start declining mid-September
Los Angeles in September — Full Picture
September is the value transition month. School-out crowds end Labor Day weekend (first Monday September), and hotel prices start declining 15-25% from August peak by mid-September. Weather remains dry-season peak — 30°C days, sea at 20°C.
LA Marathon (alternating March + September with location/season swap) draws 25,000+ runners through the city. The Stadium-to-Sea route (Dodger Stadium → Santa Monica Pier) is the canonical course.
The smart value play — late September captures summer weather + early shoulder-season prices.
What to Wear & What to Pack
T-shirts + shorts during day. Light layer for cooler evenings. Marginal cooling from August peak.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
24°C
12.7°C
3.3/mo
Summer (Jun·Jul·Aug)
29.7°C
17.3°C
0.3/mo
Autumn (Sep·Oct·Nov)
Current26.7°C
14.7°C
2.3/mo
Winter (Dec·Jan·Feb)
20.3°C
9.7°C
6/mo
Los Angeles Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 20° | 9° | 6d·73mm | 7.5h | 55% | 4 | Moderate | Shoulder | |
| 21° | 10° | 6d·80mm | 8h | 56% | 5 | Moderate | Shoulder | |
| March (Best) | 22° | 11° | 5d·50mm | 9h | 56% | 7 | Moderate | Shoulder |
| April (Best) | 24° | 12° | 3d·18mm | 10h | 55% | 9 | Busy | Peak |
| May (Best) | 26° | 15° | 2d·5mm | 10.5h | 60% | 10 | Busy | Peak |
| June (Best) | 28° | 16° | 1d·3mm | 11h | 65% | 10 | Busy | Peak |
| July (Best) | 30° | 18° | 0d·1mm | 11.5h | 65% | 11 | Very busy | Peak |
| 31° | 18° | 0d·1mm | 11h | 65% | 11 | Very busy | Peak | |
| September (Best) | 30° | 17° | 1d·6mm | 10.5h | 65% | 10 | Busy | Peak |
| October (Best) | 27° | 15° | 2d·16mm | 9.5h | 60% | 7 | Moderate | Shoulder |
| 23° | 12° | 4d·30mm | 8.5h | 55% | 5 | Moderate | Shoulder | |
| 20° | 10° | 6d·60mm | 7h | 55% | 4 | Very busy | Peak |
View Other Months
Los Angeles September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Los Angeles?
Los Angeles in September is Excellent. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Los Angeles in September?
Los Angeles September averages a high of 30°C and a low of 17°C.
Does it rain much in Los Angeles in September?
Los Angeles September averages 6mm of rainfall over about 1 rainy days.
What should I wear in Los Angeles in September?
T-shirts + shorts during day. Light layer for cooler evenings. Marginal cooling from August peak.
What time are sunrise and sunset in Los Angeles in September?
Los Angeles September sunrise is 06:32 and sunset is 18:55, with 12h 23m of daylight.
What's the air quality like in Los Angeles in September?
Los Angeles September air quality (AQI) averages 85, rated Moderate. PM2.5 averages 38μg/m³.
What activities are recommended in Los Angeles in September?
In September, Los Angeles is great for Beach + last warm sea, All outdoor sights, Hollywood + sights (post-Labor Day crowds gone).
Is September peak season in Los Angeles?
Los Angeles September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Los Angeles
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.