Average Weather in September in Santa Barbara California, United States
In Santa Barbara, the month of September is characterized by essentially constant daily high temperatures, with daily highs around 76°F throughout the month, rarely exceeding 84°F or dropping below 69°F.
Daily low temperatures decrease by 3°F, from 59°F to 56°F, rarely falling below 50°F or exceeding 64°F.
For reference, on August 25, the hottest day of the year, temperatures in Santa Barbara typically range from 59°F to 77°F, while on December 27, the coldest day of the year, they range from 42°F to 63°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in September
The month of September in Santa Barbara experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 9% to 13%.
The clearest day of the month is September 5, with clear, mostly clear, or partly cloudy conditions 91% of the time.
For reference, on February 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santa Barbara, the chance of a wet day over the course of September is gradually increasing, starting the month at 1% and ending it at 3%.
For reference, the year's highest daily chance of a wet day is 22% on February 20, and its lowest chance is 0% on July 29.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Santa Barbara is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Santa Barbara, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 1 minute, implying an average daily decrease of 2 minutes, 7 seconds, and weekly decrease of 14 minutes, 48 seconds.
The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 52 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Santa Barbara is 6:32 AM on September 1 and the latest sunrise is 21 minutes later at 6:52 AM on September 30.
The latest sunset is 7:24 PM on September 1 and the earliest sunset is 41 minutes earlier at 6:43 PM on September 30.
Daylight saving time is observed in Santa Barbara during 2017, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:46 AM and sets 14 hours, 28 minutes later, at 8:14 PM, while on December 21, the shortest day of the year, it rises at 7:01 AM and sets 9 hours, 51 minutes later, at 4:52 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Santa Barbara is essentially constant during September, remaining around 1% throughout.
For reference, on September 16, the muggiest day of the year, there are muggy conditions 1% of the time, while on November 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Santa Barbara is essentially constant during September, remaining within 0.2 miles per hour of 6.4 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 8.5 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.
Average Wind Speed in September
Wind Direction in September
Santa Barbara is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Santa Barbara is essentially constant during September, remaining around 64°F throughout.
The highest average surface water temperature during September is 64°F on September 15.
Average Water Temperature in September
The average daily incident shortwave solar energy in Santa Barbara is decreasing during September, falling by 1.3 kWh, from 7.1 kWh to 5.8 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Santa Barbara are 34.421 deg latitude, -119.698 deg longitude, and 128 ft elevation.
The topography within 2 miles of Santa Barbara contains very significant variations in elevation, with a maximum elevation change of 850 feet and an average elevation above sea level of 172 feet. Within 10 miles contains very significant variations in elevation (3,937 feet). Within 50 miles also contains extreme variations in elevation (8,819 feet).
The area within 2 miles of Santa Barbara is covered by artificial surfaces (79%) and water (13%), within 10 miles by water (44%) and shrubs (27%), and within 50 miles by water (41%) and shrubs (30%).
This report illustrates the typical weather in Santa Barbara year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Santa Barbara.
For each station, the records are corrected for the elevation difference between that station and Santa Barbara according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Santa Barbara is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santa Barbara and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .