Long Beach weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: January – December
What is the weather like in Long Beach in September?
In September, Long Beach is hot: daytime highs average 28 °C, and nights cool down to about 18 °C. The sea averages 20.5 °C – refreshing for a swim. With around 10 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 8 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Long Beach.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 91 | 96 | 98 |
| Day | 28° | 28° | 25° |
| Night | 18° | 18° | 15° |
| Sea | 21° | 21° | 19° |
| Sun | 11 h | 10 h | 8 h |
| Rain days | 0 | 1 | 2 |
More details for September
- Daylight
- 12 h 26 min06:35 – 19:01
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 28 %on averageAll months
- Hot days
- 8 days30 °C or moreAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %92 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
Long Beach in September: quick answers
Is Long Beach hot in September?
Yes. In September, Long Beach is hot: daytime highs average 28 °C and nights stay around 18 °C. On about 8 days the thermometer climbs to 30 °C or more.
Can you swim in Long Beach in September?
Yes. In September the sea averages 20.5 °C – refreshing for a swim.
Does it rain much in Long Beach in September?
It hardly ever rains.
Long Beach month by month
The whole year in Long BeachAll destinations: USAWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences