Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Stepping into September, Isla Vista records an average high-temperature of a still warm 77.4°F (25.2°C), almost consistent with August. Nighttime temperature experiences an average drop to an enjoyable 61.7°F (16.5°C) in September.Humidity
September through November, with an average relative humidity of 56%, are the least humid months.Rainfall
In Isla Vista, in September, during 1.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. In Isla Vista, during the entire year, the rain falls for 43.7 days and collects up to 7.68" (195mm) of precipitation.Ocean temperature
In Isla Vista, the average seawater temperature in September is 61.3°F (16.3°C).Note: Swimming in 61.3°F (16.3°C) is not pleasurable for most people. Breathing control grows increasingly challenging as the water temperature falls under 69.8°F (21°C).
Daylight
In Isla Vista, the average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:33 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:44 pm PDT.
Sunshine
In September, the average sunshine is 11.2h.UV index
The months with the highest UV index in Isla Vista are June through September, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 6 during September leads to these advisories:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What are the least humid months?
What is the average humidity in September?
How much does it rain in September?
How cold is the water in September?
What is the average length of the day in September?
What time are sunrise and sunset in September in Isla Vista?
How long on average sun shines in September?
What is the month with the highest UV index?
How high is the UV index in September?
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).
Average pressure in September
Isla Vista, 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).
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).
Average humidity in September
Isla Vista, 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%).
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").
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).
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).
Average daylight in September /
Average sunshine in September
Isla Vista, 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).
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).
Average UV index in September
Isla Vista, 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).
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).
Average visibility in September
Isla Vista, 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).
Isla Vista, California, USA
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