The National Weather Service forecasts mostly sunny skies here in Cobb County on Monday, July 21, 2025, with a high near 92 degrees.
The National Weather Service has issued a hazardous weather outlook for Cobb County and other parts of the region due to isolated to scattered thunderstorms that are expected this afternoon and evening. A few storms may produce gusty winds, heavy rainfall, and frequent lightning.
Heat indices ranging from 100 to 108 degrees are expected across parts of central and eastern Georgia. A Heat Advisory is in effect for areas where widespread values at or above 105 degrees are expected. Precautions should be taken to avoid heat-related illnesses.
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Bonus for the more weather-curious among you … To read an article about interpreting a weather news report with some of the typical terminology defined, follow this link.
To read an article about interpreting a weather news report, with some of the typical terminology defined, follow this link.
What does the extended forecast have in store?
This forecast is centered on Dobbins Air Reserve Base in Marietta.
Today
A 40 percent chance of showers and thunderstorms, mainly between 2 p.m and 5 p.m. Patchy fog between 7 a.m and 8 a.m. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 98. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
A 10 percent chance of showers and thunderstorms before 8 p.m. Partly cloudy, with a low around 73. West wind 5 to 10 mph, with gusts as high as 15 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after 2 p.m. Mostly sunny, with a high near 94. Heat index values as high as 101. Northwest wind around 5 mph.
Tuesday Night
A chance of showers and thunderstorms before 11 p.m, then a chance of showers between 11 p.m and 2 a.m. Mostly cloudy, with a low around 72. North wind around 5 mph becoming east after midnight. Chance of precipitation is 30 percent.
Wednesday
A 30 percent chance of showers and thunderstorms after 2 p.m. Mostly sunny, with a high near 91. East wind around 10 mph, with gusts as high as 15 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 8 p.m. Mostly clear, with a low around 73.
Thursday
A 40 percent chance of showers and thunderstorms after 2 p.m. Mostly sunny, with a high near 90.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 8 p.m. Partly cloudy, with a low around 73.
Friday
A slight chance of showers and thunderstorms between 8 a.m and 2 p.m, then showers likely and possibly a thunderstorm after 2 p.m. Mostly sunny, with a high near 91. Chance of precipitation is 60 percent.
Friday Night
Showers likely and possibly a thunderstorm before 8 p.m, then a slight chance of showers and thunderstorms between 8 p.m and 2 a.m. Partly cloudy, with a low around 73. Chance of precipitation is 60 percent.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
What was the climate like in the latest reporting period?
The NWS climate summary for metro Atlanta has now been updated with June 2025 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.
| Date | High temp | Low temp | Avg temp | Deviation from norm | Precipitation |
| 2025-06-01 | 81 | 62 | 71.5 | -3.6 | 0 |
| 2025-06-02 | 86 | 63 | 74.5 | -0.9 | 0 |
| 2025-06-03 | 87 | 68 | 77.5 | 1.9 | 0 |
| 2025-06-04 | 80 | 68 | 74 | -1.8 | 0.24 |
| 2025-06-05 | 83 | 68 | 75.5 | -0.5 | 0.02 |
| 2025-06-06 | 90 | 70 | 80 | 3.8 | T |
| 2025-06-07 | 91 | 71 | 81 | 4.6 | 0.07 |
| 2025-06-08 | 83 | 70 | 76.5 | -0.1 | 0.04 |
| 2025-06-09 | 84 | 70 | 77 | 0.2 | 0.11 |
| 2025-06-10 | 86 | 70 | 78 | 1 | 0.1 |
| 2025-06-11 | 87 | 69 | 78 | 0.8 | 0.01 |
| 2025-06-12 | 89 | 72 | 80.5 | 3.1 | 1.56 |
| 2025-06-13 | 88 | 72 | 80 | 2.4 | 0.1 |
| 2025-06-14 | 89 | 71 | 80 | 2.3 | 0.22 |
| 2025-06-15 | 89 | 70 | 79.5 | 1.6 | 0 |
| 2025-06-16 | 89 | 73 | 81 | 2.9 | T |
| 2025-06-17 | 90 | 71 | 80.5 | 2.2 | 0.09 |
| 2025-06-18 | 90 | 71 | 80.5 | 2.1 | 0.02 |
| 2025-06-19 | 86 | 70 | 78 | -0.6 | 0.32 |
| 2025-06-20 | 90 | 68 | 79 | 0.3 | 0 |
| 2025-06-21 | 92 | 72 | 82 | 3.1 | 0 |
| 2025-06-22 | 93 | 76 | 84.5 | 5.5 | 0 |
| 2025-06-23 | 94 | 76 | 85 | 5.8 | 0 |
| 2025-06-24 | 95 | 77 | 86 | 6.7 | 0 |
| 2025-06-25 | 96 | 73 | 84.5 | 5.1 | T |
| 2025-06-26 | 92 | 72 | 82 | 2.4 | T |
| 2025-06-27 | 92 | 71 | 81.5 | 1.8 | 0.95 |
| 2025-06-28 | 91 | 70 | 80.5 | 0.7 | 0.15 |
| 2025-06-29 | 89 | 71 | 80 | 0.1 | 0.36 |
| 2025-06-30 | 89 | 72 | 80.5 | 0.5 | T |
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.”
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