September weather forecast and climate
Isla Vista, CA

Weather in September

September, the first month of the autumn, in Isla Vista, is still a warm month, with average temperature varying between 61.7°F (16.5°C) and 77.4°F (25.2°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still warm 77.4°F (25.2°C). In September, 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 Isla Vista.

Rainfall

In September, in Isla Vista, the rain falls for 1.9 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. Throughout the year, there are 43.7 rainfall days, and 7.68" (195mm) of precipitation is accumulated.

Ocean temperature

In September, the average ocean temperature is 61.3°F (16.3°C).
Note: 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).

Daylight

The average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine in Isla Vista is 11.2h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Isla Vista, California. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Isla Vista?

In Isla Vista, in September, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 61.7°F (16.5°C).

What is the least humid month in Isla Vista?

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

What is the average humidity in September in Isla Vista?

The average relative humidity in September in Isla Vista is 56%.

How much does it rain in Isla Vista in September?

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

What is the ocean temperature in September in Isla Vista?

In Isla Vista, California, the average seawater temperature in September 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).

What is the average length of the day in September in Isla Vista?

In September, the average length of the day in Isla Vista, California, is 12.4h.

How many hours of sunshine does Isla Vista have in September?

In Isla Vista, California, the average sunshine in September is 11.2h.

When is the highest UV index in Isla Vista?

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

What is the UV index intensity in September in Isla Vista?

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

Average temperature in September
Isla Vista, CA

Average temperature in September - Isla Vista, 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
Isla Vista, CA

Average pressure in September - Isla Vista, 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
Isla Vista, CA

Average wind speed in September - Isla Vista, 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
Isla Vista, CA

Average humidity in September - Isla Vista, 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
Isla Vista, CA

Average rainfall in September - Isla Vista, 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
Isla Vista, CA

Average rainfall days in September - Isla Vista, 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
Isla Vista, CA

Average sea temperature in September - Isla Vista, 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
Isla Vista, CA

Average daylight in September / Average sunshine in September - Isla Vista, 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
Isla Vista, CA

Average sunshine days in September - Isla Vista, 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
Isla Vista, CA

Average UV index in September - Isla Vista, 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
Isla Vista, CA

Average cloud cover in September - Isla Vista, 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
Isla Vista, CA

Average visibility in September - Isla Vista, 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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