September weather forecastSanta Barbara, CA
September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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).
Average daylight in September /
Average sunshine in September
Santa Barbara, CA
- Average daylight in September: 12h and 24min
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 12min
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
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).
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).
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).
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).
