The National Weather Service forecasts partly sunny skies here in Cobb County on Friday, July 21, 2023, with a high near 92 degrees.
Tonight it is expected to be mostly cloudy, with an overnight low of around 69 degrees.
What does the extended forecast have in store?
This forecast is centered on Dobbins Air Reserve Base in Marietta.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1 p.m. Partly sunny, with a high near 92. Heat index values as high as 102. West wind 5 to 15 mph, with gusts as high as 20 mph.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
A 10 percent chance of showers and thunderstorms before 7 p.m. Partly cloudy, with a low around 66. Northwest wind around 5 mph.
Sunday
Sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 67.
Monday
Sunny, with a high near 90.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny, with a high near 92.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
Wednesday Night
A 10 percent chance of showers and thunderstorms. Mostly clear, with a low around 70.
Thursday
A 30 percent chance of showers and thunderstorms. 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 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.
The June metro Atlanta climate summary
| Date | Temperature | Precipitation | |||
| Maximum | Minimum | Average | Departure | ||
| 2023-06-01 | 84 | 64 | 74 | -1.1 | 0 |
| 2023-06-02 | 87 | 68 | 77.5 | 2.1 | 0 |
| 2023-06-03 | 89 | 67 | 78 | 2.4 | 0 |
| 2023-06-04 | 82 | 68 | 75 | -0.8 | 0.52 |
| 2023-06-05 | 84 | 64 | 74 | -2 | 0 |
| 2023-06-06 | 90 | 68 | 79 | 2.8 | T |
| 2023-06-07 | 90 | 69 | 79.5 | 3.1 | 0 |
| 2023-06-08 | 85 | 70 | 77.5 | 0.9 | 0 |
| 2023-06-09 | 85 | 66 | 75.5 | -1.3 | 0 |
| 2023-06-10 | 87 | 63 | 75 | -2 | 0 |
| 2023-06-11 | 84 | 67 | 75.5 | -1.7 | 0.67 |
| 2023-06-12 | 81 | 66 | 73.5 | -3.9 | 0.18 |
| 2023-06-13 | 79 | 63 | 71 | -6.6 | 0 |
| 2023-06-14 | 76 | 67 | 71.5 | -6.2 | 0.84 |
| 2023-06-15 | 82 | 68 | 75 | -2.9 | 0 |
| 2023-06-16 | 88 | 71 | 79.5 | 1.4 | 0 |
| 2023-06-17 | 90 | 69 | 79.5 | 1.2 | 0 |
| 2023-06-18 | 86 | 69 | 77.5 | -0.9 | T |
| 2023-06-19 | 78 | 67 | 72.5 | -6.1 | 1 |
| 2023-06-20 | 85 | 70 | 77.5 | -1.2 | 0.03 |
| 2023-06-21 | 76 | 66 | 71 | -7.9 | 0.37 |
| 2023-06-22 | 81 | 65 | 73 | -6 | 0.05 |
| 2023-06-23 | 85 | 69 | 77 | -2.2 | 0 |
| 2023-06-24 | 88 | 67 | 77.5 | -1.8 | 0 |
| 2023-06-25 | 92 | 68 | 80 | 0.6 | 0.67 |
| 2023-06-26 | 91 | 67 | 79 | -0.6 | 0 |
| 2023-06-27 | 89 | 72 | 80.5 | 0.8 | 0 |
| 2023-06-28 | 90 | 70 | 80 | 0.2 | 0 |
| 2023-06-29 | 92 | 72 | 82 | 2.1 | 0 |
| 2023-06-30 | 90 | 72 | 81 | 1 | 0.05 |
| Observations for each day cover the 24 hours ending at the time given below (Local Standard Time). |
|||||
| Max Temperature : midnight | |||||
| Min Temperature : midnight | |||||
| Precipitation : midnight | |||||
Climate Almanac for metro Atlanta: July 21
This almanac represents the historical climate conditions for today’s calendar date so it can be compared with today’s results. In other words, today is July 21, so the almanac gives numbers on what we would expect today to be like based on the averages and highs/lows on July 21 of past years.
|
Daily Data |
Observed |
Normal |
Record Highest |
Record Lowest |
|
Max Temperature |
M |
90 |
102 in 1986 |
76 in 1920 |
|
Min Temperature |
M |
72 |
80 in 1881 |
61 in 1929 |
|
Avg Temperature |
M |
81.2 |
88.5 in 1993 |
71.5 in 1929 |
|
Precipitation |
M |
0.14 |
4.03 in 1899 |
0.00 in 2019 |
|
Snowfall |
M |
0.0 |
0.0 in 2022 |
0.0 in 2022 |
|
Snow Depth |
M |
– |
0 in 2022 |
0 in 2022 |
|
HDD (base 65) |
M |
0 |
0 in 2022 |
0 in 2022 |
|
CDD (base 65) |
M |
16 |
24 in 1993 |
7 in 1929 |
|
Month-to-Date Summary |
Observed |
Normal |
Record Highest |
Record Lowest |
|
Avg Max Temperature |
92.1 |
90.0 |
97.1 in 1980 |
81.1 in 1892 |
|
Avg Min Temperature |
73.2 |
71.6 |
75.9 in 1980 |
64.2 in 1967 |
|
Avg Temperature |
82.6 |
80.8 |
86.5 in 1980 |
72.9 in 1967 |
|
Total Precipitation |
1.54 |
3.41 |
14.34 in 2005 |
0.17 in 1995 |
|
Total Snowfall |
0.0 |
0.0 |
T in 2001 |
0.0 in 2023 |
|
Max Snow Depth |
0 |
– |
T in 1942 |
0 in 2023 |
|
Total HDD (base 65) |
0 |
0 |
4 in 1892 |
0 in 2023 |
|
Total CDD (base 65) |
356 |
332 |
458 in 1980 |
171 in 1967 |
|
Year-to-Date Summary |
Observed |
Normal |
Record Highest |
Record Lowest |
|
Avg Max Temperature |
74.0 |
72.2 |
75.6 in 2012 |
65.9 in 1895 |
|
Avg Min Temperature |
55.6 |
52.6 |
55.9 in 2017 |
46.0 in 1940 |
|
Avg Temperature |
64.8 |
62.4 |
65.7 in 2012 |
56.3 in 1940 |
|
Total Precipitation |
26.85 |
29.14 |
47.00 in 1912 |
14.14 in 1986 |
|
Total Snowfall (since July 1) |
0.0 |
0.0 |
T in 2001 |
0.0 in 2023 |
|
Max Snow Depth (since July 1) |
0 |
– |
T in 1942 |
0 in 2023 |
|
Total HDD (since July 1) |
0 |
0 |
4 in 1892 |
0 in 2023 |
|
Total CDD (since Jan 1) |
1021 |
1016 |
1256 in 2012 |
577 in 1961 |
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.”
