Average Weather in October in Sacramento California, United States
In Sacramento, the month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 12°F, from 84°F to 72°F over the course of the month, and rarely exceeding 94°F or dropping below 63°F.
Daily low temperatures decrease by 7°F, from 55°F to 49°F, rarely falling below 42°F or exceeding 61°F.
For reference, on July 19, the hottest day of the year, temperatures in Sacramento typically range from 61°F to 94°F, while on December 31, the coldest day of the year, they range from 39°F to 53°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
The month of October in Sacramento experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 20% to 37%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 80% of the time.
For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover Categories in October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sacramento, the chance of a wet day over the course of October is very rapidly increasing, starting the month at 5% and ending it at 15%.
For reference, the year's highest daily chance of a wet day is 31% on February 20, and its lowest chance is 0% on July 21.
Probability of Precipitation in October
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during October in Sacramento is rapidly increasing, starting the month at 0.6 inches, when it rarely exceeds 1.6 inches, and ending the month at 1.8 inches, when it rarely exceeds 4.1 inches or falls below 0.2 inches.
Average Monthly Rainfall in October
Over the course of October in Sacramento, 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, 11 minutes, implying an average daily decrease of 2 minutes, 23 seconds, and weekly decrease of 16 minutes, 39 seconds.
The shortest day of the month is October 31, with 10 hours, 35 minutes of daylight and the longest day is October 1, with 11 hours, 46 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Sacramento is 7:02 AM on October 1 and the latest sunrise is 30 minutes later at 7:31 AM on October 31.
The latest sunset is 6:48 PM on October 1 and the earliest sunset is 42 minutes earlier at 6:06 PM on October 31.
Daylight saving time is observed in Sacramento during 2017, but it neither starts nor ends during October, 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, 52 minutes later, at 8:33 PM, while on December 21, the shortest day of the year, it rises at 7:20 AM and sets 9 hours, 28 minutes later, at 4:48 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Sacramento is essentially constant during October, remaining around 0% throughout.
For reference, on July 30, the muggiest day of the year, there are muggy conditions 0% 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 October
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Sacramento is essentially constant during October, remaining around 2.9 miles per hour throughout.
For reference, on July 20, the windiest day of the year, the daily average wind speed is 3.9 miles per hour, while on October 21, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
The lowest daily average wind speed during October is 2.8 miles per hour on October 21.
Average Wind Speed in October
Wind Direction in October
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Sacramento is rapidly decreasing during October, falling by 1.7 kWh, from 5.2 kWh to 3.5 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Sacramento are 38.582 deg latitude, -121.494 deg longitude, and 20 ft elevation.
The topography within 2 miles of Sacramento is essentially flat, with a maximum elevation change of 33 feet and an average elevation above sea level of 24 feet. Within 10 miles is essentially flat (135 feet). Within 50 miles contains only modest variations in elevation (4,760 feet).
The area within 2 miles of Sacramento is covered by artificial surfaces (86%) and herbaceous vegetation (10%), within 10 miles by artificial surfaces (48%) and cropland (42%), and within 50 miles by cropland (37%) and grassland (29%).
This report illustrates the typical weather in Sacramento 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 Sacramento.
For each station, the records are corrected for the elevation difference between that station and Sacramento 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 Sacramento is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sacramento and a given station.
The stations contributing to this reconstruction are: Sacramento Executive Airport (41%, 8 kilometers, south); Mc Clellan Airfield (22%, 13 kilometers, northeast); Sacramento International Airport (16%, 15 kilometers, northwest); Sacramento Mather Airport (14%, 17 kilometers, east); and University Airport (7%, 26 kilometers, west).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.