Average Weather in September in Wapato Washington, United States
Daily high temperatures decrease by 11°F, from 85°F to 74°F, rarely falling below 64°F or exceeding 94°F.
Daily low temperatures decrease by 8°F, from 53°F to 44°F, rarely falling below 36°F or exceeding 61°F.
For reference, on July 30, the hottest day of the year, temperatures in Wapato typically range from 59°F to 92°F, while on December 23, the coldest day of the year, they range from 25°F to 36°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 Wapato experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 27% to 37%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 73% of the time.
For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.
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 Wapato, the chance of a wet day over the course of September is gradually increasing, starting the month at 6% and ending it at 9%.
For reference, the year's highest daily chance of a wet day is 33% on December 1, and its lowest chance is 3% on August 16.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Wapato is gradually increasing, starting the month at 0.3 inches, when it rarely exceeds 0.8 inches or falls below -0.0 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.3 inches or falls below 0.1 inches.
Average Monthly Rainfall in September
Over the course of September in Wapato, 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, 34 minutes, implying an average daily decrease of 3 minutes, 15 seconds, and weekly decrease of 22 minutes, 44 seconds.
The shortest day of the month is September 30, with 11 hours, 44 minutes of daylight and the longest day is September 1, with 13 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Wapato is 6:21 AM on September 1 and the latest sunrise is 37 minutes later at 6:59 AM on September 30.
The latest sunset is 7:40 PM on September 1 and the earliest sunset is 57 minutes earlier at 6:43 PM on September 30.
Daylight saving time is observed in Wapato 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 5:08 AM and sets 15 hours, 49 minutes later, at 8:58 PM, while on December 21, the shortest day of the year, it rises at 7:42 AM and sets 8 hours, 35 minutes later, at 4:17 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Wapato is essentially constant during September, remaining around 0% throughout.
For reference, on July 16, 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 September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Wapato is essentially constant during September, remaining around 6.6 miles per hour throughout.
For reference, on March 31, the windiest day of the year, the daily average wind speed is 7.7 miles per hour, while on December 20, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Wapato typically lasts for 5.7 months (173 days), from around April 24 to around October 15, rarely starting before April 2 or after May 15, and rarely ending before September 27 or after November 1.
The month of September in Wapato is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 86% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Wapato are increasing during September, increasing by 403°F, from 2,506°F to 2,909°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Wapato is rapidly decreasing during September, falling by 1.7 kWh, from 5.9 kWh to 4.2 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 Wapato are 46.448 deg latitude, -120.420 deg longitude, and 856 ft elevation.
The topography within 2 miles of Wapato is essentially flat, with a maximum elevation change of 82 feet and an average elevation above sea level of 854 feet. Within 10 miles is essentially flat (1,804 feet). Within 50 miles contains very significant variations in elevation (7,871 feet).
The area within 2 miles of Wapato is covered by shrubs (42%), artificial surfaces (28%), cropland (17%), and grassland (14%), within 10 miles by cropland (65%) and shrubs (20%), and within 50 miles by shrubs (61%) and cropland (17%).
This report illustrates the typical weather in Wapato 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Wapato.
For each station, the records are corrected for the elevation difference between that station and Wapato 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 Wapato is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Wapato and a given station.
The stations contributing to this reconstruction are: Yakima Air Terminal Airport (83%, 16 kilometers, northwest); Hanford (12%, 64 kilometers, east); and The Dalles Municipal Airport (5%, 109 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .