Cobb County weather forecast for Thursday, September 21, 2023

Photo of Veterans Memorial Highway on a clear day with the Cobb County Courier logo and the words "Weather forecast"

The National Weather Service forecasts partly sunny skies here in Cobb County on Thursday, September 21, 2023, with a high near 80 degrees.

Tonight it is expected to be mostly clear, with an overnight low of around 61 degrees.

What does the extended forecast have in store?

This forecast is centered on Dobbins Air Reserve Base in Marietta.


Partly sunny, with a high near 80. East wind 5 to 10 mph. 


Mostly clear, with a low around 61. East wind around 5 mph. 


Sunny, with a high near 80. Northeast wind 5 to 10 mph. 

Friday Night

Mostly clear, with a low around 59. Northeast wind around 5 mph. 


Sunny, with a high near 81. Northwest wind 5 to 10 mph, with gusts as high as 15 mph. 

Saturday Night

Mostly clear, with a low around 57.


Sunny, with a high near 82.

Sunday Night

Partly cloudy, with a low around 60.


A 20 percent chance of showers after 2 p.m. Mostly sunny, with a high near 82.

Monday Night

A 30 percent chance of showers, mainly after 2 a.m. Mostly cloudy, with a low around 63.


A 30 percent chance of showers. Partly sunny, with a high near 77.

Tuesday Night

A 30 percent chance of showers. Mostly cloudy, with a low around 62.


A 30 percent chance of showers. Partly sunny, with a high near 75.

What was the climate like in the latest reporting period?

The NWS climate summary for metro Atlanta has now been updated with August 2023 figures.

In an article entitled What is the Difference between Climate and Weather?, the National Ocean Service describes the difference as follows:

“Weather is what you see outside on any particular day. So, for example, it may be 75° degrees and sunny or it could be 20° degrees with heavy snow. That’s the weather.

“Climate is the average of that weather. For example, you can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July. This is climate. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall. If you’ve ever heard your local weather person say “today we hit a record high for this day,” she is talking about climate records.

“So when we are talking about climate change, we are talking about changes in long-term averages of daily weather. In most places, weather can change from minute-to-minute, hour-to-hour, day-to-day, and season-to-season. Climate, however, is the average of weather over time and space.”

The climate report for the Atlanta area for the previous month shows how much departure from the average temperatures that month represents. The average temperature for a date is the average over a 30-year period.

DateMax TempMin TempAverageDepature from normPrecipitation

Climate Almanac for metro Atlanta

This almanac provides information on past climate conditions for today’s date, September 21, allowing a comparison to current weather. Simply put, it helps you see what the weather would typically be like on this day according to historical data.

Daily DataObservedNormalRecord HighestRecord Lowest
Max TemperatureM8395 in 201063 in 1913
Min TemperatureM6577 in 192543 in 1918
Avg TemperatureM73.686.0 in 192554.5 in 1918
PrecipitationM0.122.29 in 19580.00 in 2022
SnowfallM0.00.0 in 20220.0 in 2022
Snow DepthM0 in 20220 in 2022
HDD (base 65)M010 in 19180 in 2022
CDD (base 65)M921 in 19250 in 2020
Month-to-Date SummaryObservedNormalRecord HighestRecord Lowest
Avg Max Temperature85.285.195.7 in 192577.1 in 1902
Avg Min Temperature68.467.274.7 in 192560.2 in 1967
Avg Temperature76.876.285.2 in 192568.8 in 1967
Total Precipitation1.292.6213.27 in 18880.00 in 1897
Total Snowfall0.00.00.0 in 20230.0 in 2023
Max Snow Depth00 in 20230 in 2023
Total HDD (base 65)0123 in 19180 in 2023
Total CDD (base 65)240236429 in 192591 in 1967
Year-to-Date SummaryObservedNormalRecord HighestRecord Lowest
Avg Max Temperature77.975.978.4 in 201270.1 in 1885
Avg Min Temperature59.456.759.4 in 202351.0 in 1940
Avg Temperature68.666.368.8 in 201261.3 in 1940
Total Precipitation33.5737.4055.58 in 192022.45 in 1931
Total Snowfall (since July 1)0.00.0T in 20010.0 in 2023
Max Snow Depth (since July 1)0T in 19420 in 2023
Total HDD (since July 1)0123 in 19180 in 2023
Total CDD (since Jan 1)202418842325 in 20191137 in 1967

Period of Record:

  • Max Temperature : 1878-10-04 to 2023-09-20
  • Min Temperature : 1878-10-04 to 2023-09-20
  • Precipitation : 1878-10-01 to 2023-09-20
  • Snowfall : 1928-12-25 to 2023-09-19
  • Snow Depth : 1928-12-25 to 2023-09-18

Climate and climate change coverage in the Cobb County Courier

As climate change warms rivers, they are running out of breath – and so could the plants and animals they harbor

Looking for a US ‘climate haven’ away from heat and disaster risks? Good luck finding one

Extreme Heat Is Particularly Hard On Older Adults, And An Aging Population And Climate Change Are Putting Ever More People At Risk

How Climate Change Intensifies The Water Cycle, Fueling Extreme Rainfall And Flooding – The Northeast Deluge Was Just The Latest

Republicans’ Anti-ESG Attack May Be Silencing Insurers, But It Isn’t Changing Their Pro-Climate Business Decisions

KSU Professor Awarded NSF Grant To Study Effects Of Climate Change On Farming Communities In Iceland And Greenland

For much more information on the climate in our area, visit the NWS Climate FAQ for the Atlanta area.

What does the National Weather Service do?

The National Weather Service (NWS) is a part of the National Oceanic and Atmospheric Administration (NOAA).

The NWS describes its role as follows:

“The National Weather Service (NWS) provides weather, water, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy. 

“These services include Forecasts and Observations, Warnings, Impact-based Decision Support Services, and Education in an effort to build a Weather-Ready Nation. The ultimate goal is to have a society that is prepared for and responds to weather, water and climate events.”