September weather forecast
Big Sur, CA

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Weather in September

September's arrival marks the onset of autumn in Big Sur while maintaining the vestiges of the summer's warmth. From August’s minimal rainfall, September witnesses a minor rise as the precipitation climbs to 0.08" (2mm), rationed over 2.4 days. The month serves up a delightful blend of summer's residual warmth and the emerging flourish of the fall season, creating a spectacle of atmospheric allure that only September in Big Sur can offer.

Temperature

In Big Sur, California, the average temperatures in September are the highest, with a peak at 69.6°F (20.9°C) and a low of 55.4°F (13°C).

Humidity

In September, the average relative humidity in Big Sur is 75%.

Rainfall

In Big Sur, in September, it is raining for 2.4 days, with typically 0.08" (2mm) of accumulated precipitation. In Big Sur, during the entire year, the rain falls for 70 days and collects up to 11.93" (303mm) of precipitation.

Ocean temperature

The months with the warmest seawater are August through October, with an average ocean temperature of 59°F (15°C).
Note: Most people do not enjoy swimming in water that is 59°F (15°C). Breathing becomes increasingly challenging as the water temperature dips under 69.8°F (21°C).

Daylight

In Big Sur, California, the average length of the day in September is 12h and 23min.
On the first day of the month, sunrise is at 6:39 am and sunset at 7:34 pm. On the last day of September, in Big Sur, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

Sunshine

The average sunshine in September is 11h.

UV index

June through September, with an average maximum UV index of 5, are months with the highest UV index in Big Sur. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the UV index of 5 transforms into the following advice:
Take necessary precautions - Defending against sun damage is advocated. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
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Frequently asked questions

What month is the hottest in Big Sur?

In Big Sur, September is identified by the average highest temperatures, reaching a peak of 69.6°F (20.9°C) and a low of 55.4°F (13°C).

What are the temperatures in Big Sur in September?

The high-temperature in Big Sur during September is 69.6°F (20.9°C) and the low-temperature is 55.4°F (13°C).

What is the average humidity in September in Big Sur?

The average relative humidity in September in Big Sur is 75%.

How many days does it rain in September in Big Sur?

In Big Sur, California, in September, during 2.4 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

What months are the ocean warmest in Big Sur?

August through October, with an average ocean temperature of 59°F (15°C), are months with the warmest seawater in Big Sur, California.

How cold is the water in September in Big Sur?

In September, the average ocean temperature in Big Sur, California, is 59°F (15°C). For most, swimming in 59°F (15°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in September in Big Sur?

In September, the average day length in Big Sur, California, is 12h and 23min.

When are sunrise and sunset in September in Big Sur?

On the first day of September in Big Sur, sunrise is at 6:39 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

How many hours of sunshine does Big Sur have in September?

The average sunshine duration in September in Big Sur, California, is 11h.

What is the month with the highest UV index in Big Sur?

The months with the highest UV index in Big Sur are June through September, with an average maximum UV index of 5.

What is the UV index intensity in September in Big Sur?

In September, the average daily maximum UV index in Big Sur is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Big Sur, CA

Average temperature in September - Big Sur, CA
  • Average high temperature in September: 69.6°F

The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).

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Average pressure in September
Big Sur, CA

Average pressure in September - Big Sur, CA
  • Average pressure in September: 29.93"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 (29.93"Hg).

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Average wind speed in September
Big Sur, CA

Average wind speed in September - Big Sur, CA
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in September
Big Sur, CA

Average humidity in September - Big Sur, CA
  • Average humidity in September: 75%

The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is November (70%).

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Average rainfall in September
Big Sur, CA

Average rainfall in September - Big Sur, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in September
Big Sur, CA

Average rainfall days in September - Big Sur, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (1.3 days).

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Average sea temperature in September
Big Sur, CA

Average sea temperature in September - Big Sur, CA
  • Average sea temperature in September: 59°F

The best months for swimming (with the highest average sea temperature) are August, September and October (59°F).
The coldest months (with the lowest average sea temperature) are March, April and May (54°F).

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Average daylight in September /
Average sunshine in September
Big Sur, CA

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

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 11h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in September
Big Sur, CA

Average sunshine days in September - Big Sur, CA
  • Average sunshine days in September: 26.8 days

The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in September
Big Sur, CA

Average UV index in September - Big Sur, CA
  • Average UV index in September: 5

The months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Big Sur, CA

Average cloud cover in September - Big Sur, CA
  • Average cloud cover in September: 15

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in September
Big Sur, CA

Average visibility in September - Big Sur, 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).

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Big Sur, California, USA

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