Average Weather in September in Calexico California, United States
Daily high temperatures decrease by 8°F, from 105°F to 97°F, rarely falling below 88°F or exceeding 111°F.
Daily low temperatures decrease by 10°F, from 78°F to 69°F, rarely falling below 61°F or exceeding 84°F.
For reference, on July 23, the hottest day of the year, temperatures in Calexico typically range from 80°F to 107°F, while on December 28, the coldest day of the year, they range from 43°F to 68°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 Calexico experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 11% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 10% on September 18.
The clearest day of the month is September 18, with clear, mostly clear, or partly cloudy conditions 90% of the time.
For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 35%, while on September 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
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 Calexico, the chance of a wet day over the course of September is essentially constant, remaining around 4% throughout.
For reference, the year's highest daily chance of a wet day is 11% on February 18, and its lowest chance is 0% on June 26.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Calexico is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Calexico, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 57 minutes, implying an average daily decrease of 1 minute, 59 seconds, and weekly decrease of 13 minutes, 51 seconds.
The shortest day of the month is September 30, with 11 hours, 52 minutes of daylight and the longest day is September 1, with 12 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Calexico is 6:16 AM on September 1 and the latest sunrise is 19 minutes later at 6:35 AM on September 30.
The latest sunset is 7:06 PM on September 1 and the earliest sunset is 39 minutes earlier at 6:27 PM on September 30.
Daylight saving time is observed in Calexico during 2018, 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 5:34 AM and sets 14 hours, 18 minutes later, at 7:53 PM, while on December 21, the shortest day of the year, it rises at 6:40 AM and sets 10 hours, 0 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Calexico is very rapidly decreasing during September, falling from 31% to 7% over the course of the month.
For reference, on August 12, the muggiest day of the year, there are muggy conditions 39% 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 Calexico is essentially constant during September, remaining within 0.2 miles per hour of 6.9 miles per hour throughout.
For reference, on May 7, the windiest day of the year, the daily average wind speed is 9.0 miles per hour, while on January 11, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.
The highest daily average wind speed during September is 7.1 miles per hour on September 23.
Average Wind Speed in September
Wind Direction in September
While it does not do so every year, freezing temperatures are seen in Calexico over some winters. The day least likely to be in the growing season is January 11, with a 78% chance.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Calexico are very rapidly increasing during September, increasing by 925°F, from 5,562°F to 6,487°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Calexico is gradually decreasing during September, falling by 0.9 kWh, from 6.8 kWh to 5.9 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 Calexico are 32.679 deg latitude, -115.499 deg longitude, and 0 ft elevation.
The topography within 2 miles of Calexico is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 1 foot. Within 10 miles is essentially flat (151 feet). Within 50 miles contains only modest variations in elevation (6,302 feet).
The area within 2 miles of Calexico is covered by shrubs (36%), cropland (33%), and artificial surfaces (31%), within 10 miles by cropland (58%) and shrubs (22%), and within 50 miles by shrubs (47%) and cropland (22%).
This report illustrates the typical weather in Calexico 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 Calexico.
For each station, the records are corrected for the elevation difference between that station and Calexico 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 Calexico is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Calexico and a given station.
The stations contributing to this reconstruction are: Imperial County Airport (60%, 19 kilometers, northwest) and General Rodolfo Sánchez Taboada International Airport (40%, 25 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .