Crescent City
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Crescent City, CA

The magnificent red and white stone Battery Point Lighthouse in Crescent City, California
The magnificent red and white stone Battery Point Lighthouse in Crescent City, California
The first month of the autumn, September, is also an enjoyable month in Crescent City, California, with average temperature varying between 48.7°F (9.3°C) and 66°F (18.9°C).

Temperature

August and September, with an average high-temperature of 66°F (18.9°C), are the warmest months.

Rainfall

In Crescent City, in September, it is raining for 3.7 days, with typically 1.9" (47mm) of accumulated precipitation. Throughout the year, there are 97.7 rainfall days, and 70.3" (1785mm) of precipitation is accumulated.

Ocean temperature

In Crescent City, the average seawater temperature in September is 52.3°F (11.3°C).
Note: Swimming in 52.3°F (11.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Crescent City, the average length of the day in September is 12.5h.

Sunshine

In Crescent City, California, the average sunshine is 8h.

UV index

In Crescent City, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the warmest month in Crescent City?

Warmest months in Crescent City, California, are August and September, with an average high-temperature of 66°F (18.9°C).

What is the temperature in September in Crescent City?

In Crescent City, California, in September, the average high-temperature is 66°F (18.9°C), and the average low-temperature is 48.7°F (9.3°C).

How much does it rain in Crescent City in September?

In Crescent City, California, in September, during 3.7 rainfall days, 1.9" (47mm) of precipitation is typically accumulated.

How cold is the water in September in Crescent City?

In Crescent City, California, in September, the average water temperature is 52.3°F (11.3°C). Swimming in 52.3°F (11.3°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 Crescent City have in September?

In Crescent City, California, the average length of the day in September is 12.5h.

How many hours of sunshine does Crescent City have in September?

In September, the average sunshine is 8h.

What is the UV index intensity in September in Crescent City?

The average daily maximum UV index in September in Crescent City, California, is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Crescent City, CA
  • Average high temperature in September: 66°F

Warmest months (with the highest average high temperature) are August and September (66°F).
The month with the lowest average high temperature is January (53.6°F).

  • Average low temperature in September: 48.7°F

The month with the highest average low temperature is August (50.8°F).
The coldest month (with the lowest average low temperature) is December (38.9°F).

Average rainfall in September - Crescent City, CA
  • Average rainfall in September: 1.9"

The wettest month (with the highest rainfall) is December (11.9").
The driest month (with the lowest rainfall) is July (0.4").

Average rainfall days in September - Crescent City, CA
  • Average rainfall days in September: 3.7 days

The month with the highest number of rainy days is March (13.4 days).
The month with the lowest number of rainy days is July (1.6 days).

Average sea temperature in September - Crescent City, CA
  • Average sea temperature in September: 52.3°F

The best month for swimming (with the highest average sea temperature) is October (52.6°F).
The coldest month (with the lowest average sea temperature) is April (50.7°F).

Average daylight in September / Average sunshine in September - Crescent City, CA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8h

Months with most sunshine are June and July (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 3h).

Average UV index in September - Crescent City, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 1).