Redondo Beach
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Redondo Beach, CA

The first month of the autumn, September, is still a warm month in Redondo Beach, California, with average temperature ranging between min 64.2°F (17.9°C) and max 76.5°F (24.7°C).

Temperature

In Redondo Beach, the average high-temperature is relatively the same as in August - a still moderately hot 76.5°F (24.7°C). In September, in Redondo Beach, the average low-temperature is 64.2°F (17.9°C).

Humidity

The average relative humidity in Redondo Beach is 67%.

Rainfall

In Redondo Beach, during September, the rain falls for 3.5 days and regularly aggregates up to 0.28" (7mm) of precipitation. 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: Swimming in 66.7°F (19.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In Redondo Beach, the average length of the day in September is 12.4h.

Sunshine

The average sunshine in Redondo Beach is 10.4h.

UV index

Months with the highest UV index in Redondo Beach are July through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Redondo Beach?

In Redondo Beach, California, in September, the average high-temperature is 76.5°F (24.7°C), and the average low-temperature is 64.2°F (17.9°C).

What is the average humidity in September in Redondo Beach?

In Redondo Beach, California, the average relative humidity in September is 67%.

How many days does it rain in September in Redondo Beach?

In Redondo Beach, in September, during 3.5 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

What is the ocean temperature in September in Redondo Beach?

In Redondo Beach, in September, the average water temperature is 66.7°F (19.3°C). Swimming in 66.7°F (19.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the average length of the day in September in Redondo Beach?

The average length of the day in September is 12.4h.

How many hours of sunshine does Redondo Beach have in September?

In September, the average sunshine is 10.4h.

What is the month with the highest UV index in Redondo Beach?

Months with the highest UV index are July through September, with an average maximum UV index of 6.

What is the UV index reading in September in Redondo Beach?

In September, the average daily maximum UV index in Redondo Beach is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation.
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

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 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: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 10.4h

The month with the most sunshine is August (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 6.6h).

Average UV index in September - Redondo Beach, CA
  • Average UV index in September: 6

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).