Cobb County weather forecast for Wednesday, June 21, 2023

Cobb weather May 18: Photo of cloudy skies above a residential street

The National Weather Service forecasts showers and thunderstorms here in Cobb County on Wednesday, June 21, 2023, with a high near 73 degrees.

The National Weather Service has issued a hazardous weather outlook for Cobb County and other parts of the region due to thunderstorms that will have the potential for strong winds and frequent lightning. A Flood Watch has also been issued for a large portion of the forecast area where 1 to 2 inches of rain is expected today, on average, but localized values could reach up to 5 inches in isolated locations.

What does the extended forecast have in store?

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

Today

Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3 p.m. High near 73. East wind 5 to 10 mph. Chance of precipitation is 80 percent. New rainfall amounts between a half and three quarters of an inch possible.

Tonight

Showers and thunderstorms before 11 p.m, then showers likely and possibly a thunderstorm between 11 p.m and midnight, then a chance of showers and thunderstorms after midnight. Low around 63. East wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 80 percent. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday

Showers likely and possibly a thunderstorm before 1 p.m, then showers and thunderstorms likely between 1 p.m and 3 p.m, then showers and possibly a thunderstorm after 3 p.m. High near 74. East wind 5 to 10 mph. Chance of precipitation is 80 percent. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Showers and possibly a thunderstorm before 9 p.m, then a chance of showers and thunderstorms between 9 p.m and 3 a.m, then a slight chance of showers after 3 a.m. Low around 63. South wind around 5 mph becoming north in the evening. Chance of precipitation is 80 percent.

Friday

A chance of showers, with thunderstorms also possible after 3 p.m. Partly sunny, with a high near 81. West wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 40 percent.

Friday Night

A 40 percent chance of showers and thunderstorms before 9 p.m. Mostly clear, with a low around 64.

Saturday

Sunny, with a high near 86.

Saturday Night

Mostly clear, with a low around 65.

Sunday

A 20 percent chance of showers and thunderstorms after 3 p.m. Sunny, with a high near 89.

Sunday Night

A slight chance of showers and thunderstorms before 9 p.m, then a chance of showers and thunderstorms after 3 a.m. Partly cloudy, with a low around 69. Chance of precipitation is 30 percent.

Monday

Showers and thunderstorms likely. Partly sunny, with a high near 87. Chance of precipitation is 60 percent.

Monday Night

Showers and thunderstorms likely. Partly cloudy, with a low around 69. Chance of precipitation is 60 percent.

Tuesday

A 20 percent chance of showers and thunderstorms. Sunny, with a high near 88.

What was the climate like in the latest reporting period?

The NWS climate summary for metro Atlanta has now been updated with November 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 TempAverageDeparture from norm
2023-05-01685059.0-8.30.00
2023-05-02734860.5-7.00.00
2023-05-03724860.0-7.80.00
2023-05-04755062.5-5.60.00
2023-05-05645861.0-7.30.01
2023-05-06765967.5-1.10.00
2023-05-07836172.03.10.00
2023-05-08866776.57.3T
2023-05-09856876.57.10.00
2023-05-10846775.55.80.00
2023-05-11816774.04.0T
2023-05-12796773.02.80.23
2023-05-13866575.55.00.00
2023-05-14907080.09.30.00
2023-05-15857077.56.50.06
2023-05-16886878.06.70.29
2023-05-17816673.52.0T
2023-05-18726468.0-3.8T
2023-05-19736167.0-5.00.00
2023-05-20776571.0-1.30.56
2023-05-21806572.50.0T
2023-05-22706366.5-6.30.41
2023-05-23726468.0-5.00.01
2023-05-24806572.5-0.80.00
2023-05-25816271.5-2.00.00
2023-05-26776269.5-4.30.00
2023-05-27776068.5-5.50.00
2023-05-28795868.5-5.70.00
2023-05-29756268.5-6.00.00
2023-05-30836172.0-2.70.00
2023-05-31796773.0-1.90.00
Sum243119281.57
Average78.462.270.3-0.9
Normal81.161.371.23.56
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
Snowfall : midnight
Snow Depth : 7am
Daily DataObservedNormalRecord HighestRecord Lowest
Max TemperatureM8598 in 189559 in 1967
Min TemperatureM6675 in 198549 in 1972
Avg TemperatureM75.486.0 in 198555.0 in 1967
PrecipitationM0.131.55 in 19120.00 in 2022
SnowfallM0.00.0 in 20220.0 in 2022
Snow DepthM0 in 20220 in 2022
HDD (base 65)M010 in 19670 in 2022
CDD (base 65)M1021 in 19850 in 1997
Month-to-Date SummaryObservedNormalRecord HighestRecord Lowest
Avg Max Temperature84.084.796.5 in 189562.5 in 1967
Avg Min Temperature64.065.873.5 in 201146.5 in 1889
Avg Temperature74.075.384.3 in 201157.5 in 1967
Total Precipitation0.000.262.86 in 20010.00 in 2023
Total Snowfall0.00.00.0 in 20230.0 in 2023
Max Snow DepthM0 in 20220 in 2022
Total HDD (base 65)0015 in 19670 in 2023
Total CDD (base 65)92139 in 20110 in 1972
Year-to-Date SummaryObservedNormalRecord HighestRecord Lowest
Avg Max Temperature69.567.071.1 in 201759.8 in 1895
Avg Min Temperature51.047.151.6 in 188039.6 in 1940
Avg Temperature60.257.061.2 in 201750.0 in 1940
Total Precipitation20.9321.4539.15 in 192910.91 in 1986
Total Snowfall (since July 1)0.12.210.9 in 19360.0 in 2019
Max Snow Depth (since July 1)08 in 19400 in 2023
Total HDD (since July 1)193225293832 in 19771690 in 2017
Total CDD (since Jan 1)318318499 in 2019111 in 1997
Period of Record:Max Temperature : 1878-10-04 to 2023-06-01Min Temperature : 1878-10-04 to 2023-06-01Precipitation : 1878-10-01 to 2023-06-01Snowfall : 1928-12-25 to 2023-06-01Snow Depth : 1928-12-25 to 2023-05-30

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.”