Santa Cruz
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Santa Cruz, CA

A high aerial view of the bay area in Santa Cruz, California, view of the beach sand, numerous parked cars, scenic trees, and residential homes
A high aerial view of the bay area in Santa Cruz, California, view of the beach sand, numerous parked cars, scenic trees, and residential homes
The first month of the autumn, September, is still a warm month in Santa Cruz, California, with temperature in the range of an average low of 52.5°F (11.4°C) and an average high of 74.5°F (23.6°C).

Temperature

September is the warmest month, with an average high-temperature of 74.5°F (23.6°C) and an average low-temperature of 52.5°F (11.4°C).

Rainfall

In Santa Cruz, in September, it is raining for 1.5 days, with typically 0.3" (6.9mm) of accumulated precipitation. Throughout the year, there are 66.2 rainfall days, and 31.5" (801mm) of precipitation is accumulated.

Ocean temperature

With an average ocean temperature of 58.1°F (14.5°C), September is the month with the warmest seawater. At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

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

Sunshine

In Santa Cruz, the average sunshine is 9h.

UV index

In September, the average daily maximum UV index in Santa Cruz is 7. A UV Index estimate of 6 to 7 represents a high threat to health from the exposure to the Sun's UV radiation for the average person.
The average daily UV index of 7 transform into the following instructions:
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 warmest month in Santa Cruz?

The warmest month in Santa Cruz, California, is September, with an average high-temperature of 74.5°F (23.6°C) and an average low-temperature of 52.5°F (11.4°C).

What is the temperature in September in Santa Cruz?

In Santa Cruz, California, in September, the average high-temperature is 74.5°F (23.6°C), and the average low-temperature is 52.5°F (11.4°C).

How much does it rain in Santa Cruz in September?

In Santa Cruz, California, during September, the rain falls for 1.5 days and regularly aggregates up to 0.3" (6.9mm) of precipitation.

What month is the ocean warmest in Santa Cruz?

September is the month with the warmest seawater in Santa Cruz, with an average ocean temperature of 58.1°F (14.5°C). Swimming in 58.1°F (14.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How cold is the water in September in Santa Cruz?

In Santa Cruz, in September, the average water temperature is 58.1°F (14.5°C). Swimming in 58.1°F (14.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Santa Cruz have in September?

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

How many hours of sunshine does Santa Cruz have in September?

The average sunshine in September in Santa Cruz is 9h.

What is the UV index intensity in September in Santa Cruz?

In Santa Cruz, California, the average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - Santa Cruz, CA
  • Average high temperature in September: 74.5°F

The warmest month (with the highest average high temperature) is September (74.5°F).
The month with the lowest average high temperature is December (60°F).

  • Average low temperature in September: 52.6°F

The month with the highest average low temperature is August (53.9°F).
Coldest months (with the lowest average low temperature) are January and December (40.8°F).

Average rainfall in September - Santa Cruz, CA
  • Average rainfall in September: 0.3"

The wettest month (with the highest rainfall) is January (6.4").
Driest months (with the lowest rainfall) are July and August (0").

Average rainfall days in September - Santa Cruz, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is February (10.9 days).
The month with the lowest number of rainy days is July (0.3 days).

Average sea temperature in September - Santa Cruz, CA
  • Average sea temperature in September: 58.2°F

The best month for swimming (with the highest average sea temperature) is September (58.2°F).
The coldest month (with the lowest average sea temperature) is April (53.9°F).

Average daylight in September / Average sunshine in September - Santa Cruz, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 9h

Months with most sunshine are May, June and July (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 5h).

Average UV index in September - Santa Cruz, CA
  • Average UV index in September: 7

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).