September weather forecastLong Beach, CA
September
Weather in September
September marks the advent of fall in Long Beach, California. The weather takes a comfortable turn, becoming significantly less hot and paving the way for a lovely autumn. The month showcases a blend of warm and cool temperatures, varying from 64.8°F (18.2°C) to 78.8°F (26°C). As October surfaces, it continues the occasional rainfall brought by September, making it a colorful month filled with fall foliage. September's perfectly balanced weather makes it a favorite among those who appreciate light breezes and mild temperatures.Temperature
Long Beach experiences a subtle adjustment in high-temperatures to a still moderately hot 78.8°F (26°C) with the onset of September, maintaining near parity with August's 79.5°F (26.4°C). An average low-temperature of 64.8°F (18.2°C) is recorded in the month of September in Long Beach.Humidity
In September, the average relative humidity is 63%.Rainfall
In September, the rain falls for 3.3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In Long Beach, during the entire year, the rain falls for 47.2 days and collects up to 5.59" (142mm) of precipitation.Ocean temperature
In September, the average ocean temperature is 66.7°F (19.3°C).Note: Swimming is not an enjoyable activity for the majority when the water is at 66.7°F (19.3°C). The difficulty of controlling breathing increases as the temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
In Long Beach, the average length of the day in September is 12h and 22min.On the first day of September in Long Beach, sunrise is at 6:27 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:37 pm PDT.
Sunshine
The average sunshine in September is 10.6h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index in Long Beach, California. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 6 translates into these guidelines:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Long Beach, CA
- Average high temperature in September: 78.8°F
The warmest month (with the highest average high temperature) is August (79.5°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in September: 64.8°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 (52°F).
Average pressure in September
Long Beach, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).
Average wind speed in September
Long Beach, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (5mph).
Average humidity in September
Long Beach, CA
- Average humidity in September: 63%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (55%).
Average rainfall in September
Long Beach, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is December (1.14").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Long Beach, CA
- Average rainfall days in September: 3.3 days
The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is June (1.8 days).
Average sea temperature in September
Long Beach, CA
- Average sea temperature in September: 66.7°F
The best months for swimming (with the highest average sea temperature) are July and August (67.9°F).
The coldest month (with the lowest average sea temperature) is January (58.3°F).
Average daylight in September /
Average sunshine in September
Long Beach, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 36min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in September
Long Beach, CA
- Average sunshine days in September: 22.7 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is June (20.8 days).
Average UV index in September
Long Beach, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
Long Beach, CA
- Average cloud cover in September: 9
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Long Beach, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
