The National Weather Service is forecasting mostly cloudy skies with highs of around 91 degrees here in Cobb County for Sunday, August 18, 2024.
The National Weather Service has issued a severe weather forecast for Cobb County and other parts of the region, as isolated to scattered thunderstorms are possible across most of the state. Some storms may become strong to severe, especially south of Interstate 20, and may produce damaging wind gusts and isolated large hail, as well as frequent lightning and locally heavy rainfall. A slight danger (level 2 of 5) is in effect for parts of central and south-central Georgia.
What you will read in this article
- The extended forecast for Cobb County
- Climate overview of the last month for the Atlanta metropolitan area
- The Climate Almanac for the Atlanta Metropolitan Region
- What the National Weather Service is and what it does
What does the extended forecast hold?
This forecast focuses on Dobbins Air Force Base in Marietta.
Today
A slight chance of rain before 7 a.m., then a slight chance of rain and thunderstorms after 4 p.m. Mostly cloudy, then gradually sunny, with a high around 91. West wind 5 to 15 mph, with gusts as high as 20 mph. A 20 percent chance of precipitation.
Tonight
A slight chance of rain and thunderstorms before 8 p.m., then a slight chance of rain between 8 and 9 p.m. Mostly clear, with a low around 67. Northwest wind 5 to 10 mph. A 20 percent chance of precipitation.
Monday
Sunny, high temperature around 30 degrees Celsius. Northwest wind 8 to 24 km/h, with gusts up to 32 km/h.
Monday night
Mostly clear, with a low around 64. North wind 5 to 10 mph, with gusts as high as 15 mph.
Tuesday
Sunny, maximum temperature around 30 degrees Celsius. North wind 8 to 16 km/h, with gusts up to 24 km/h.
Tuesday night
Sure, low about 62.
Wednesday
Sunny, high around 87.
Wednesday night
Mostly clear, low around 65.
Thursday
Sunny, high around 87.
Thursday night
Mostly clear, low around 64.
Friday
Sunny, high around 87.
Friday night
Mostly clear, low around 65.
Saturday
Sunny, high around 89.
What was the climate like in the last reporting period?
The NWS climate summary for the Atlanta metropolitan area has now been updated with July 2024 figures.
In an article titled “What is the difference between climate and weather?” the National Ocean Service describes the difference as follows:
“Weather is what you see outside on a given day. For example, it could be 24°C and sunny, or -6°C and heavy snowfall. That’s the weather.”
“Climate is the average of this weather. For example, you can expect snow in the northeast in January or hot and humid in the southeast in July. That is climate. Climate records also include extreme values such as record temperatures or record amounts of precipitation. If you have ever heard your local weather report say, “Today we have reached a record temperature for this day,” then they are talking about climate records.
“So when we talk about climate change, we’re talking about changes in the long-term averages of daily weather. In most places, the weather can change from minute to minute, hour to hour, day to day, and season to season. Climate, on the other hand, is the average of the weather over time and space.”
The climate report for the Atlanta region for the previous month shows how much the deviation is from the average temperatures of that month. The average temperature for a date is the average over a period of 30 years.
| Date | Max | Minimum | Average | Deviation from the norm | precipitation |
| 01.07.2024 | 97 | 79 | 88 | 7.9 | 0 |
| 02.07.2024 | 90 | 76 | 83 | 2.8 | 0 |
| 03.07.2024 | 92 | 77 | 84.5 | 4.2 | 0 |
| 04.07.2024 | 97 | 76 | 86.5 | 6.1 | 0.01 |
| 05.07.2024 | 94 | 76 | 85 | 4.5 | 1.43 |
| 06.07.2024 | 93 | 76 | 84.5 | 3.9 | 0.02 |
| 07.07.2024 | 90 | 74 | 82 | 1.4 | 1.75 |
| 08.07.2024 | 91 | 74 | 82.5 | 1.8 | T |
| 09.07.2024 | 92 | 75 | 83.5 | 2.7 | 0.29 |
| 10.07.2024 | 88 | 73 | 80.5 | -0.3 | 0 |
| 11.07.2024 | 91 | 70 | 80.5 | -0.4 | 0 |
| 12.07.2024 | 94 | 75 | 84.5 | 3.5 | 0 |
| 13.07.2024 | 97 | 76 | 86.5 | 5.5 | 0 |
| 14.07.2024 | 97 | 77 | 87 | 6 | 0 |
| 15.07.2024 | 96 | 75 | 85.5 | 4.4 | T |
| 16.07.2024 | 91 | 74 | 82.5 | 1.4 | 0 |
| 17.07.2024 | 92 | 75 | 83.5 | 2.4 | 0.06 |
| 18.07.2024 | 92 | 74 | 83 | 1.8 | 0.09 |
| 19.07.2024 | 87 | 73 | 80 | -1.2 | 0.39 |
| 20.07.2024 | 83 | 70 | 76.5 | -4.7 | 1.39 |
| 21.07.2024 | 89 | 72 | 80.5 | -0.7 | 0.04 |
| 22.07.2024 | 87 | 72 | 79.5 | -1.7 | 0 |
| 23.07.2024 | 90 | 75 | 82.5 | 1.3 | 1.1 |
| 24.07.2024 | 88 | 71 | 79.5 | -1.8 | 1.52 |
| 25.07.2024 | 87 | 74 | 80.5 | -0.8 | 0.75 |
| 26.07.2024 | 91 | 73 | 82 | 0.8 | 0.39 |
| 27.07.2024 | 85 | 73 | 79 | -2.2 | T |
| 28.07.2024 | 80 | 73 | 76.5 | -4.7 | 3.47 |
| 29.07.2024 | 87 | 71 | 79 | -2.2 | 0.65 |
| 30.07.2024 | 92 | 71 | 81.5 | 0.3 | 0.65 |
| 31.07.2024 | 93 | 73 | 83 | 1.8 | 0.02 |
Climate Almanac for the Atlanta Metropolitan Region
This almanac provides information on past climate conditions for today’s date, August 18, and allows comparison with current weather.
Simply put, it helps you see what the weather would typically be like on that day based on historical data.
| Daily data | Observed | Normal | Record high | Record low |
| Maximum temperature | M | 89 | 101 in 2000 | 70 in 1981 |
| Min. temperature | M | 71 | 80 in 2000 | 62 in 1964 |
| Average temperature | M | 80.2 | 90.5 in 2000 | 67.5 in 1905 |
| precipitation | M | 0.14 | 1.78 in 1998 | 0.00 in 2023 |
| Snowfall | M | 0.0 | 0.0 in 2023 | 0.0 in 2023 |
| Snow depth | M | – | 0 in 2023 | 0 in 2023 |
| Hard drive (base 65) | M | 0 | 0 in 2023 | 0 in 2023 |
| CDD (Base 65) | M | 15 | 26 in 2000 | 3 in 1981 |
| Monthly overview | Observed | Normal | Record high | Record low |
| Average maximum temperature | 92.9 | 89.6 | 97.9 in 2007 | 80.8 in 1884 |
| Average minimum temperature | 73.8 | 71.8 | 76.2 in 2007 | 65.4 in 1976 |
| Average temperature | 83.3 | 80.7 | 87.1 in 2007 | 73.3 in 1884 |
| Total precipitation | 0.54 | 2.47 | 8.68 in 1920 | 0.02 in 1925 |
| Total snowfall | 0.0 | 0.0 | 0.0 in 2024 | 0.0 in 2024 |
| Maximum snow depth | 0 | – | 0 in 2024 | 0 in 2024 |
| Total HDD (base 65) | 0 | 0 | 2 in 1894 | 0 in 2024 |
| Total CDD (base 65) | 315 | 283 | 402 in 2007 | 154 in 1884 |
| Annual overview | Observed | Normal | Record high | Record low |
| Average maximum temperature | 76.5 | 74.3 | 77.5 in 2012 | 68.3 in 1912 |
| Average minimum temperature | 57.6 | 54.9 | 57.9 in 2017 | 49.1 in 1940 |
| Average temperature | 67.0 | 64.6 | 67.7 in 2012 | 59.3 in 1940 |
| Total precipitation | 43.28 | 32,95 | 52.11 in 1920 | 17.51 in 2007 |
| Total snowfall (since July 1) | 0.0 | 0.0 | T in 2001 | 0.0 in 2024 |
| Maximum snow depth (since July 1) | 0 | – | T in 1942 | 0 in 2024 |
| Total HDD (since July 1) | 0 | 0 | 4 in 1936 | 0 in 2024 |
| Total CDD (since 1 January) | 1768 | 1462 | 1768 in 2024 | 930 in 1976 |
Recording period:
- Maximum temperature: 04.10.1878 to 17.08.2024
- Min. temperature: 04.10.1878 to 17.08.2024
- Precipitation: 01.10.1878 to 17.08.2024
- Snowfall: 25.12.1928 to 16.08.2024
- Snow depth: 25.12.1928 to 15.08.2024
For more information about the climate in our region, see the NWS Climate FAQs for the Atlanta Region.
What does the National Weather Service do?
The National Weather Service (NWS) is 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 alerts for the United States, its territories, adjacent waters, and marine areas, to protect life and property and to strengthen the national economy.
“These services include forecasts and observations, warnings, impact-based decision support services and education in an effort to build a weather-resilient nation. The ultimate goal is a society that is prepared for and responsive to weather, water and climate events.”
