September weather forecastRedondo Beach, CA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Redondo Beach, California, with an average temperature fluctuating between 76.5°F (24.7°C) and 64.2°F (17.9°C).Temperature
September's advent notes a subtle adjustment in average high-temperature to a still moderately hot 76.5°F (24.7°C) from August. Redondo Beach registers a consistent average low-temperature of 64.2°F (17.9°C) during September.Humidity
In Redondo Beach, the average relative humidity in September is 67%.Rainfall
In Redondo Beach, in September, during 3.5 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. Throughout the year, there are 54.5 rainfall days, and 7.91" (201mm) of precipitation is accumulated.Ocean temperature
In Redondo Beach, in September, the average water temperature is 66.7°F (19.3°C).Note: In 66.7°F (19.3°C), swimming is not an enjoyable activity for most. As the temperature decreases from 69.8°F (21°C) to 59°F (15°C), it becomes harder to control breathing.
Daylight
The average length of the day in September in Redondo Beach is 12h and 22min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:18 pm. On the last day of September, in Redondo Beach, sunrise is at 6:47 am and sunset at 6:38 pm PDT.
Sunshine
The average sunshine in September is 10.4h.UV index
The months with the highest UV index are July through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. 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
Redondo Beach, CA
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (62.8°F).
- Average low temperature in September: 64.2°F
The months with the highest average low temperature are August and September (64.2°F).
The coldest month (with the lowest average low temperature) is February (52.2°F).
Average pressure in September
Redondo Beach, CA
- Average pressure in September: 29.9"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).
Average wind speed in September
Redondo Beach, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest months (with the lowest average wind speed) are August and September (5.2mph).
Average humidity in September
Redondo Beach, CA
- Average humidity in September: 67%
The month with the highest relative humidity is June (74%).
The month with the lowest relative humidity is November (57%).
Average rainfall in September
Redondo Beach, CA
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is January (1.5").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in September
Redondo Beach, CA
- Average rainfall days in September: 3.5 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (3 days).
Average sea temperature in September
Redondo 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
Redondo 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: 9h and 54min).
- Average sunshine in September: 10h and 24min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in September
Redondo Beach, CA
- Average sunshine days in September: 22.3 days
The months with the most sunshine days are January and October (24.9 days).
The month with the least sunshine days is June (19.6 days).
Average UV index in September
Redondo Beach, CA
- Average UV index in September: 6
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in September
Redondo Beach, CA
- Average cloud cover in September: 12
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in September
Redondo 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).
