Average Weather in September in Enumclaw Washington, United States
In Enumclaw, the month of September is characterized by falling daily high temperatures, with daily highs decreasing by 9°F, from 75°F to 67°F over the course of the month, and rarely exceeding 86°F or dropping below 58°F.
Daily low temperatures decrease by 5°F, from 54°F to 49°F, rarely falling below 42°F or exceeding 60°F.
For reference, on August 3, the hottest day of the year, temperatures in Enumclaw typically range from 57°F to 79°F, while on January 1, the coldest day of the year, they range from 35°F to 44°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 Enumclaw experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 38% to 51%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 62% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Enumclaw, the chance of a wet day over the course of September is very rapidly increasing, starting the month at 16% and ending it at 28%.
For reference, the year's highest daily chance of a wet day is 60% on November 17, and its lowest chance is 9% on August 5.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Enumclaw is rapidly increasing, starting the month at 1.5 inches, when it rarely exceeds 3.1 inches or falls below 0.1 inches, and ending the month at 3.1 inches, when it rarely exceeds 5.8 inches or falls below 0.7 inches.
Average Monthly Rainfall in September
Over the course of September in Enumclaw, 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, 37 minutes, implying an average daily decrease of 3 minutes, 20 seconds, and weekly decrease of 23 minutes, 22 seconds.
The shortest day of the month is September 30, with 11 hours, 43 minutes of daylight and the longest day is September 1, with 13 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Enumclaw is 6:27 AM on September 1 and the latest sunrise is 38 minutes later at 7:05 AM on September 30.
The latest sunset is 7:47 PM on September 1 and the earliest sunset is 58 minutes earlier at 6:48 PM on September 30.
Daylight saving time is observed in Enumclaw 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 5:12 AM and sets 15 hours, 56 minutes later, at 9:07 PM, while on December 21, the shortest day of the year, it rises at 7:51 AM and sets 8 hours, 29 minutes later, at 4:20 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Enumclaw is essentially constant during September, remaining around 0% throughout.
For reference, on July 29, 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
The average hourly wind speed in Enumclaw is essentially constant during September, remaining within 0.1 miles per hour of 1.9 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 2.9 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 1.6 miles per hour.
Average Wind Speed in September
Wind Direction in September
Enumclaw 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 Enumclaw is gradually decreasing during September, falling by 2°F, from 57°F to 55°F, over the course of the month.
Average Water Temperature in September
The average daily incident shortwave solar energy in Enumclaw is rapidly decreasing during September, falling by 1.7 kWh, from 5.3 kWh to 3.6 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 Enumclaw are 47.204 deg latitude, -121.992 deg longitude, and 735 ft elevation.
The topography within 2 miles of Enumclaw contains only modest variations in elevation, with a maximum elevation change of 364 feet and an average elevation above sea level of 735 feet. Within 10 miles contains only modest variations in elevation (4,721 feet). Within 50 miles also contains extreme variations in elevation (14,360 feet).
The area within 2 miles of Enumclaw is covered by cropland (80%) and artificial surfaces (20%), within 10 miles by trees (44%) and shrubs (28%), and within 50 miles by trees (55%) and shrubs (18%).
This report illustrates the typical weather in Enumclaw 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Enumclaw.
For each station, the records are corrected for the elevation difference between that station and Enumclaw 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 Enumclaw is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Enumclaw and a given station.
The stations contributing to this reconstruction are: Pierce County Airport Thun Field (47%, 25 kilometers, southwest); Seattle-Tacoma International Airport (26%, 36 kilometers, northwest); Renton Municipal Airport (22%, 36 kilometers, northwest); and Stampede Pass (5%, 50 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .