September weather forecast
Sea Ranch, CA

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Weather in September

September, the first month of the autumn in Sea Ranch, is also a moderately hot month, with an average temperature varying between 80.1°F (26.7°C) and 53.2°F (11.8°C).

Temperature

September brings an average high-temperature of a still moderately hot 80.1°F (26.7°C), nearly identical to the preceding month. Throughout the month of September, Sea Ranch observes a dramatic downturn from the daytime peak temperatures, expecting an average low of 53.2°F (11.8°C).

Humidity

The months with the lowest humidity are July and September, with an average relative humidity of 60%.

Rainfall

In September, the rain falls for 2.1 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. In Sea Ranch, during the entire year, the rain falls for 83.1 days and collects up to 21.38" (543mm) of precipitation.

Snowfall

In Sea Ranch, snow does not fall in January, March through December.

Ocean temperature

In Sea Ranch, the average seawater temperature in September is 55.2°F (12.9°C).
Note: In 55.2°F (12.9°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:57 pm PDT.

Sunshine

The average sunshine in September in Sea Ranch is 10.9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In Sea Ranch, in September, the average high-temperature is 80.1°F (26.7°C), and the average low-temperature is 53.2°F (11.8°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is computed to be 87.8°F (31°C).

What are the least humid months?

July and September, with an average relative humidity of 60%, are the least humid months.

What is the average humidity in September?

In September, the average relative humidity is 60%.

How much does it rain in September?

In Sea Ranch, in September, it is raining for 2.1 days, with typically 0.16" (4mm) of accumulated precipitation.

When it does not snow?

In Sea Ranch, snow does not fall in January, March through December.

What is the water temperature in September?

In September, the average ocean temperature is 55.2°F (12.9°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.

What is the average length of the day in September in Sea Ranch?

In September, the average day length is 12h and 25min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:57 pm PDT.

How long on average sun shines in September?

The average sunshine duration in September is 10.9h.

How high is the UV index in September?

In Sea Ranch, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sea Ranch, CA

Average temperature in September - Sea Ranch, CA
  • Average high temperature in September: 80.1°F

The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (54.7°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (39.9°F).

Average pressure in September
Sea Ranch, CA

Average pressure in September - Sea Ranch, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

Average wind speed in September
Sea Ranch, CA

Average wind speed in September - Sea Ranch, CA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

Average humidity in September
Sea Ranch, CA

Average humidity in September - Sea Ranch, CA
  • Average humidity in September: 60%

The month with the highest relative humidity is March (78%).
The months with the lowest relative humidity are July and September (60%).

Average rainfall in September
Sea Ranch, CA

Average rainfall in September - Sea Ranch, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is February (4.49").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in September
Sea Ranch, CA

Average rainfall days in September - Sea Ranch, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (15 days).
The month with the least rainy days is August (0.9 days).

Average snowfall in September
Sea Ranch, CA

Average snowfall in September - Sea Ranch, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.2").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in September
Sea Ranch, CA

Average snowfall days in September - Sea Ranch, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in September
Sea Ranch, CA

Average sea temperature in September - Sea Ranch, CA
  • Average sea temperature in September: 55.3°F

The best month for swimming (with the highest average sea temperature) is October (56°F).
The coldest month (with the lowest average sea temperature) is June (51.9°F).

Average daylight in September /
Average sunshine in September
Sea Ranch, CA

Average daylight in September / Average sunshine in September - Sea Ranch, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

Average sunshine days in September
Sea Ranch, CA

Average sunshine days in September - Sea Ranch, CA
  • Average sunshine days in September: 27.1 days

The months with the most sunshine days are July and August (29.6 days).
The month with the least sunshine days is March (14.6 days).

Average UV index in September
Sea Ranch, CA

Average UV index in September - Sea Ranch, CA
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).

Average cloud cover in September
Sea Ranch, CA

Average cloud cover in September - Sea Ranch, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 6).

Average visibility in September
Sea Ranch, CA

Average visibility in September - Sea Ranch, 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).

Sea Ranch, California, USA

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