Average Weather in September in Rosedale California, United States
Daily high temperatures decrease by 8°F, from 95°F to 87°F, rarely falling below 77°F or exceeding 102°F.
Daily low temperatures decrease by 7°F, from 68°F to 62°F, rarely falling below 55°F or exceeding 75°F.
For reference, on July 27, the hottest day of the year, temperatures in Rosedale typically range from 72°F to 99°F, while on December 30, the coldest day of the year, they range from 40°F to 58°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
Tocina, Spain (5,841 miles away); Oued el Abtal, Algeria (6,203 miles); and Sidi Bouzid, Tunisia (6,560 miles) are the far-away foreign places with temperatures most similar to Rosedale (view comparison).
The month of September in Rosedale 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 7, with clear, mostly clear, or partly cloudy conditions 91% of the time.
For reference, on February 21, 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
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Rosedale, 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 2.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Rosedale is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.7 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Rosedale, 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, 3 minutes, implying an average daily decrease of 2 minutes, 11 seconds, and weekly decrease of 15 minutes, 20 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, 55 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Rosedale is 6:28 AM on September 1 and the latest sunrise is 22 minutes later at 6:50 AM on September 30.
The latest sunset is 7:23 PM on September 1 and the earliest sunset is 42 minutes earlier at 6:41 PM on September 30.
Daylight saving time is observed in Rosedale during 2019, 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 5:41 AM and sets 14 hours, 33 minutes later, at 8:14 PM, while on December 22, the shortest day of the year, it rises at 7:02 AM and sets 9 hours, 46 minutes later, at 4:48 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Rosedale is essentially constant during September, remaining around 1% throughout.
For reference, on August 29, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Rosedale is essentially constant during September, remaining around 4.8 miles per hour throughout.
For reference, on May 31, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on October 24, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.
Average Wind Speed in September
Wind Direction in September
While it does not do so every year, freezing temperatures are seen in Rosedale over some winters. The day least likely to be in the growing season is December 29, with a 52% chance.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Rosedale are rapidly increasing during September, increasing by 752°F, from 4,201°F to 4,954°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Rosedale is decreasing during September, falling by 1.3 kWh, from 7.1 kWh to 5.7 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 Rosedale are 35.384 deg latitude, -119.145 deg longitude, and 364 ft elevation.
The topography within 2 miles of Rosedale is essentially flat, with a maximum elevation change of 36 feet and an average elevation above sea level of 364 feet. Within 10 miles is essentially flat (669 feet). Within 50 miles contains significant variations in elevation (8,629 feet).
The area within 2 miles of Rosedale is covered by artificial surfaces (35%), shrubs (32%), and cropland (31%), within 10 miles by cropland (53%) and artificial surfaces (19%), and within 50 miles by grassland (37%) and cropland (29%).
This report illustrates the typical weather in Rosedale 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Rosedale.
For each station, the records are corrected for the elevation difference between that station and Rosedale 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 Rosedale is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rosedale and a given station.
The stations contributing to this reconstruction are: Meadows Field (92%, 10 kilometers, northeast); Sandberg (1.7%, 81 kilometers, southeast); Santa Ynez Airport (2.4%, 121 kilometers, southwest); Santa Barbara Municipal Airport (2.3%, 124 kilometers, southwest); and Paso Robles Municipal Airport (2.0%, 138 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .