August 2021 Climate Report for Memphis, TN

August Climate Recap

With summer finally arriving in mid-July, it was not likely to let up heading into the hottest month of the year – and it did not. Twenty of thirty days reached 90 degrees and the average temperature for the month ended about a degree above normal. That above average temperature was driven entirely by overnight lows however. The average high of 91.5 was right at normal, while overnight lows averaged two degrees above normal. including one record high minimum temperature on the 26th (79 degrees).
A dry trend that started as the heat built in late July extended through August with less than 2.5 inches of rain falling for the month at the airport and even less (by about an inch) in Bartlett. The wettest day of the month at the airport, the 13th, was also the only day of measurable rainfall in the first two and a half weeks of August. Rain days became more common the last two weeks. That wet day also had the only report of severe weather for the month. Localized heavy rainfall of multiple inches fell in the afternoon resulting in flooding that stalled vehicles in East Memphis along Poplar Avenue. There were no Severe Thunderstorm Warnings issued in the metro in August.

Whoa! Deluge in East Memphis.

— (@memphisweather1) August 13, 2021

Memphis International Airport, Memphis, TN

Average temperature: 83.0 degrees (0.9 degrees above average) 
Average high temperature: 91.5 degrees (0.0 degrees below average) 
Average low temperature: 74.5 degrees (1.9 degrees below average) 
Warmest temperature: 96 degrees (24th, 25th, 26th) 
Coolest temperature: 68 degrees (4th, 5th) 
Heating Degrees Days: 0 (0 above average)
Cooling Degree Days: 566 (38 above average) 
Records set or tied: Record high minimum (26th, 79 degrees)
Comments: There were 20 days with high temperatures above 90 degrees, which is average for July.
Monthly total: 2.40″ (0.97″ below average) 
Days with measurable precipitation: 5 (2.6 days below average) 
Wettest 24-hour period: 1.05″ (13th) 
Snowfall: 0.0″
Records set or tied: None
Comments: Two days recorded precipitation of more than an one-half inch, while July averages 2.3 days.
Peak wind: East/38 mph (13th) 
Average wind: 7.2 mph 
Average relative humidity: 69% 
Average sky cover: 50% 
 Click here for a daily statistical recap for Memphis International Airport.

Cirrus Weather Solutions /, Bartlett, TN

Average temperature: 80.3 degrees 
Average high temperature: 91.4 degrees 
Average low temperature: 71.8 degrees 
Warmest temperature: 98.4 degrees (11th) 
Coolest temperature: 62.1 degrees (5th) 
Comments: None 
Monthly total: 1.43″ (automated rain gauge), 1.60″(manual CoCoRaHS rain gauge) 
Days with measurable precipitation: 6
Wettest date: 0.58″ (19th) (via automated gauge) 
Snowfall: 0.0″
Comments: None

Peak wind: North/23 mph (31st)
Average relative humidity: 80% 
Average barometric pressure: 29.97in. Hg

Comments: None

Click here for a daily statistical recap for Bartlett, TN.


MWN Forecast Accuracy

MWN average temperature error: 1.53 degrees 
MWN forecast temperatures within 2 degrees of actual: 84% 
MWN average dewpoint error: 1.45 degrees 
MWN forecast dewpoints within 2 degrees of actual: 82% 
MWN’s forecasts extend out five periods (2.5 days, or roughly 60 hours). Historical accuracy statistics can be found here.

Climate Outlook – September 2021

The September climate outlook for the United States from the Climate Prediction Center is shown below. Above average temperatures are forecast for the western states, New England, and the Florida peninsula. Slightly below average temperatures are forecast in the Lower Mississippi and Tennessee River Valleys. Odds favor very near average temperatures for Memphis with a 34% chance of below average temperatures and a 33% chance of above average conditions. The average temperature for September is 76.0 degrees, about six degrees below the August average.

Precipitation is expected to be well above normal for the Mid-Atlantic states into southern New England with wetter than average conditions extending south into the southeast U.S. Additional above average precipitation is forecast for the Desert Southwest. Below average precipitation is forecast for the Pacific Northwest. For Memphis, odds are slightly in favor of above average precipitation (37%) versus a 30% chance of below average precipitation. Rainfall historically averages only 3.03 inches.
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MWN is a NOAA Weather Ready Nation Ambassador Meteorologist Erik Proseus is an NWA Digital Seal Holder

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