September weather forecast
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

Weather in September

The first month of the autumn, September, is also an enjoyable month in Crescent City, California, with average temperature varying between 53.4°F (11.9°C) and 66.7°F (19.3°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a comfortable 66.7°F (19.3°C). In September, in Crescent City, the average low-temperature is 53.4°F (11.9°C).

Humidity

The least humid month is September, with an average relative humidity of 76%.

Rainfall

In Crescent City, California, in September, during 5.5 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, there are 131.4 rainfall days, and 45.67" (1160mm) of precipitation is accumulated.

Snowfall

Months with snowfall are February and September. September is the first month it typically snows in Crescent City. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 0.4 snowfall days, and 0.47" (12mm) of snow is accumulated.

Ocean temperature

In September, the average ocean temperature 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 September, the average length of the day in Crescent City is 12.4h.

Sunshine

In Crescent City, the average sunshine in September is 10.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the least humid month in Crescent City?

September is the least humid month, with an average relative humidity of 76%.

What is the average humidity in September in Crescent City?

The average relative humidity in September in Crescent City is 76%.

How much does it rain in Crescent City in September?

In Crescent City, in September, it is raining for 5.5 days, with typically 1.02" (26mm) of accumulated precipitation.

When does it start to snow in Crescent City?

September is the first month it typically snows in Crescent City. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How cold is the water in September in Crescent City?

In September, the average ocean temperature is 52.3°F (11.3°C). 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.

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

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

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

In September, the average sunshine in Crescent City, California, is 10.2h.

How high is the UV index in September in Crescent City?

In September, the average daily maximum UV index in Crescent City is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Crescent City, CA

Average temperature in September - Crescent City, CA
  • Average high temperature in September: 66.7°F

The warmest month (with the highest average high temperature) is August (68°F).
The month with the lowest average high temperature is December (51.3°F).

  • Average low temperature in September: 53.4°F

Months with the highest average low temperature are July and August (54.1°F).
The coldest month (with the lowest average low temperature) is February (43.2°F).

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Average pressure in September
Crescent City, CA

Average pressure in September - Crescent City, CA
  • Average pressure in September: 30"

The month with the highest atmospheric pressure is January (30.12").
The month with the lowest atmospheric pressure is August (29.99").

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Average wind speed in September
Crescent City, CA

Average wind speed in September - Crescent City, CA
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is June (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).

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Average humidity in September
Crescent City, CA

Average humidity in September - Crescent City, CA
  • Average humidity in September: 76%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is September (76%).

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Average rainfall in September
Crescent City, CA

Average rainfall in September - Crescent City, CA
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is December (8.15").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days in September
Crescent City, CA

Average rainfall days in September - Crescent City, CA
  • Average rainfall days in September: 5.5 days

The month with the highest number of rainy days is March (18.7 days).
The month with the least rainy days is July (2.4 days).

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Average snowfall in September
Crescent City, CA

Average snowfall in September - Crescent City, CA
  • Average snowfall in September: 0.04"

The month with the highest snowfall is February (0.43").
Months with the least snowfall are January, March, April, May, June, July, August, October, November and December (0").

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Average snowfall days in September
Crescent City, CA

Average snowfall days in September - Crescent City, CA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (0.2 days).
Months with the least snowfall days are January, March, April, May, June, July, August, October and November (0 days).

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Average sea temperature in September
Crescent City, CA

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).

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Average daylight in September /
Average sunshine in September
Crescent City, CA

Average daylight in September / Average sunshine in September - Crescent City, CA
  • Average daylight in September: 12.4h

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

  • Average sunshine in September: 10.2h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 5h).

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Average sunshine days in September
Crescent City, CA

Average sunshine days in September - Crescent City, CA
  • Average sunshine days in September: 24 days

The month with the most sunshine days is July (27.8 days).
The month with the least sunshine days is March (10.8 days).

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Average UV index in September
Crescent City, CA

Average UV index in September - Crescent City, CA
  • Average UV index in September: 4

Months with the highest UV index are July and August (UV index 5).
The month with the lowest UV index is February (UV index 2).

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Average cloud cover in September
Crescent City, CA

Average cloud cover in September - Crescent City, CA
  • Average cloud cover in September: 17

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in September
Crescent City, CA

Average visibility in September - Crescent City, CA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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