September weather forecast
Santa Barbara, CA

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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

With the arrival of September, Santa Barbara witnesses a slight dip in temperature to an average high of 77.4°F (25.2°C) and low of 61.7°F (16.5°C). Humidity slightly dips down to 56%, and the city sees around 0.12" (3mm) of rain - a similar picture to the preceding summer months. As autumnal hues start adorning the city, locals and visitors soak in the last remaining bits of summer warmth. Yet, as September gives way to October, a further drop in temperature is expected.

Temperature

Santa Barbara, California, notes an average high-temperature of a still warm 77.4°F (25.2°C) in September, displaying minor variation from August. During September, the nighttime temperature in Santa Barbara, California, averages of 61.7°F (16.5°C).

Humidity

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

Rainfall

In Santa Barbara, in September, it is raining for 1.9 days, with typically 0.12" (3mm) of accumulated precipitation. In Santa Barbara, California, during the entire year, the rain falls for 43.7 days and collects up to 7.68" (195mm) of precipitation.

Ocean temperature

In Santa Barbara, California, the average seawater temperature in September is 61.3°F (16.3°C).
Note: Most people do not find swimming enjoyable in water of 61.3°F (16.3°C). The task of controlling breathing becomes tougher as the temperature drops from 69.8°F (21°C) to 59°F (15°C).

Daylight

The average length of the day in September in Santa Barbara is 12h and 22min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:24 pm. On the last day of September, in Santa Barbara, sunrise is at 6:53 am and sunset at 6:43 pm PDT.

Sunshine

The average sunshine in September in Santa Barbara is 11.2h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Santa Barbara. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 6 in September transforms into the following instructions:
Inhibit overexposure. Warding off sun damage is of utmost importance. 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. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
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Frequently asked questions

What are September temperatures in Santa Barbara?

The high-temperature in Santa Barbara during September is 77.4°F (25.2°C) and the low-temperature is 61.7°F (16.5°C).

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 Santa Barbara, in September, it is raining for 1.9 days, with typically 0.12" (3mm) of accumulated precipitation.

How cold is the water in September in Santa Barbara?

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

What is the average length of the day in September in Santa Barbara?

In September, the average day length in Santa Barbara, California, is 12h and 22min.

When is the sunrise / sunset in September in Santa Barbara?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:43 pm PDT.

How many hours of sunshine does Santa Barbara have in September?

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

What are the months with the highest UV index in Santa Barbara?

June through September, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index reading in September in Santa Barbara?

The average daily maximum UV index in September in Santa Barbara is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%).
The 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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 11h and 1min

The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).

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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

The months with the highest UV index are June, July, August and September (UV index 6).
The 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

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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Santa Barbara, California, USA

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