September weather forecast and climate
Santa Barbara, CA

Orange rooftops of the courthouse buildings of Santa Barbara in California, Pacific Ocean
Orange rooftops of the courthouse buildings of Santa Barbara in California, Pacific Ocean

Weather in September

September, the first month of the autumn, in Santa Barbara, is also a moderately hot month, with average temperature varying between 61.7°F (16.5°C) and 77.4°F (25.2°C).

Temperature

In Santa Barbara, the average high-temperature in September is relatively the same as in August - a still moderately hot 77.4°F (25.2°C). In September, in Santa Barbara, California, the average low-temperature is 61.7°F (16.5°C).

Humidity

September through November, with an average relative humidity of 56%, are the least humid months in Santa Barbara.

Rainfall

In Santa Barbara, it is raining for 1.9 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, in Santa Barbara, there are 43.7 rainfall days, and 7.68" (195mm) of precipitation is accumulated.

Ocean temperature

In Santa Barbara, the average water temperature is 61.3°F (16.3°C).
Note: For most, swimming in 61.3°F (16.3°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

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

Sunshine

The average sunshine in September is 11.2h.

UV index

Months with the highest UV index in Santa Barbara are June through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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.
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FAQ

What are the least humid months in Santa Barbara?

September through November, with an average relative humidity of 56%, are the least humid months in Santa Barbara, California.

What is the average humidity in September in Santa Barbara?

In Santa Barbara, California, the average relative humidity in September is 56%.

How much does it rain in Santa Barbara in September?

In September, in Santa Barbara, California, the rain falls for 1.9 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

How cold is the water in September in Santa Barbara?

In September, the average ocean temperature in Santa Barbara, California, is 61.3°F (16.3°C). Swimming in 61.3°F (16.3°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 Santa Barbara have in September?

In September, the average length of the day in Santa Barbara, California, is 12.4h.

How long on average sun shines in September in Santa Barbara?

In Santa Barbara, the average sunshine in September is 11.2h.

When is the highest UV index in Santa Barbara?

Months with the highest UV index in Santa Barbara are June through September, with an average maximum UV index of 6.

How high is the UV index in September in Santa Barbara?

In September, the average daily maximum UV index in Santa Barbara is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Santa Barbara, CA

Average temperature in September - Santa Barbara, CA
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (60.6°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is August (62.1°F).
The coldest month (with the lowest average low temperature) is February (47.7°F).

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Average pressure in September
Santa Barbara, CA

Average pressure in September - Santa Barbara, CA
  • Average pressure in September: 29.91"

The month with the highest atmospheric pressure is January (30.11").
Months with the lowest atmospheric pressure are June, August and September (29.91").

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Average wind speed in September
Santa Barbara, CA

Average wind speed in September - Santa Barbara, CA
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).

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Average humidity in September
Santa Barbara, CA

Average humidity in September - Santa Barbara, CA
  • Average humidity in September: 56%

The month with the highest relative humidity is March (64%).
Months with the lowest relative humidity are September, October and November (56%).

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Average rainfall in September
Santa Barbara, CA

Average rainfall in September - Santa Barbara, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is January (1.57").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in September
Santa Barbara, CA

Average rainfall days in September - Santa Barbara, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.2 days).

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Average sea temperature in September
Santa Barbara, CA

Average sea temperature in September - Santa Barbara, CA
  • Average sea temperature in September: 61.3°F

The best month for swimming (with the highest average sea temperature) is August (62.2°F).
The coldest month (with the lowest average sea temperature) is April (55.7°F).

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Average daylight in September /
Average sunshine in September
Santa Barbara, CA

Average daylight in September / Average sunshine in September - Santa Barbara, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 11.2h

Months with the most sunshine are June and July (Average sunshine: 12h).
The month with the least sunshine is February (Average sunshine: 6.6h).

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Average sunshine days in September
Santa Barbara, CA

Average sunshine days in September - Santa Barbara, CA
  • Average sunshine days in September: 26.2 days

The month with the most sunshine days is August (28 days).
The month with the least sunshine days is February (21.6 days).

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Average UV index in September
Santa Barbara, CA

Average UV index in September - Santa Barbara, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in September
Santa Barbara, CA

Average cloud cover in September - Santa Barbara, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Santa Barbara, CA

Average visibility in September - Santa Barbara, 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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