Big Sur
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Big Sur, CA

September, the first month of the autumn, in Big Sur, is still a warm month, with average temperature varying between 50.4°F (10.2°C) and 77.2°F (25.1°C).

Temperature

In Big Sur, California, the average high-temperature is relatively the same as in August - a still warm 77.2°F (25.1°C). The average low-temperature, in Big Sur, is 50.4°F (10.2°C).

Rainfall

In September, in Big Sur, the rain falls for 1.3 days. Throughout September, 0.4" (10.7mm) of precipitation is accumulated. Throughout the year, there are 66.4 rainfall days, and 43.7" (1109.5mm) of precipitation is accumulated.

Ocean temperature

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

Daylight

The average length of the day in Big Sur is 12.4h.

Sunshine

In September, the average sunshine in Big Sur is 9h.

UV index

The average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV rays for the average person.
The average daily UV index of 7 transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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.

What is the temperature in September in Big Sur?

In September, in Big Sur, California, the average high-temperature is 77.2°F (25.1°C), and the average low-temperature is 50.4°F (10.2°C).

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

In Big Sur, California, in September, during 1.3 rainfall days, 0.4" (10.7mm) of precipitation is typically accumulated.

When is 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. Swimming in 59°F (15°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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). Swimming in 59°F (15°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

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

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

The average sunshine in September in Big Sur is 9h.

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

In September, the average daily maximum UV index in Big Sur is 7. 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 - Big Sur, CA
  • Average high temperature in September: 77.1°F

The warmest month (with the highest average high temperature) is August (77.3°F).
The month with the lowest average high temperature is January (59.7°F).

  • Average low temperature in September: 50.3°F

The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

Average rainfall in September - Big Sur, CA
  • Average rainfall in September: 0.4"

The wettest month (with the highest rainfall) is January (9.1").
The driest month (with the lowest rainfall) is July (0").

Average rainfall days in September - Big Sur, CA
  • Average rainfall days in September: 1.3 days

The month with the highest number of rainy days is February (11.2 days).
The month with the lowest number of rainy days is July (0.3 days).

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

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

Average daylight in September / Average sunshine in September - Big Sur, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
The month with shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 9h

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

Average UV index in September - Big Sur, CA
  • Average UV index in September: 7

Months with the highest UV index are June and July (UV index 10).
The month with the lowest UV index is December (UV index 2).