Cobb climate almanac and weather forecast for Monday, September 30, 2024

The National Weather Service is forecasting partly sunny skies here in Cobb County on Monday, September 30, 2024, with a high temperature of about 78 degrees.

The National Weather Service has issued a hazardous weather forecast for Cobb County and other parts of the region as patchy dense fog is possible in northwest Georgia through 9 a.m. this morning. River flooding will also continue along the Flint, Ocmulgee, Ohoopee and Oconee rivers in central Georgia.

What you will read in this article

1. The extended forecast for Cobb County
2. Last month's climate summary for the Atlanta metropolitan area
3. The climate almanac for the Atlanta metropolitan area
4. What the National Weather Service is and what it does

What does the extended forecast bring?

This forecast focuses on Dobbins Air Reserve Base in Marietta.

Today

Patchy fog between 8 and 9 a.m. Otherwise, partly sunny, with a high near 78. Light southwest wind becoming west at 5 to 10 mph in the afternoon.

Tonight

Partly cloudy, with a low around 62. West wind becoming calmer around 5 mph.

Tuesday

Partly sunny, with a high near 81. Light northwest wind increasing to 5 to 10 mph in the morning.

Tuesday evening

Mostly clear, with a low around 62. Northwest wind around 5 mph.

Wednesday

Sunny, with a high near 82. North wind around 5 mph becoming east in the afternoon.

Wednesday evening

Mostly clear, with a low around 62.

Thursday

Sunny, with a high near 83.

Thursday evening

Partly cloudy, with a low around 65 degrees.

Friday

Partly sunny, with a high near 80.

Friday evening

Mostly cloudy, with a low around 62.

Saturday

Mostly sunny, with a high near 81.

Saturday evening

Partly cloudy, with lows around 60°.

Sunday

Mostly sunny, with a high around 77°.

What was the climate like in the last reporting period?

The NWS climate summary for metro Atlanta has now been updated with August 2024 numbers.

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 75 degrees and sunny or it could be 20 degrees with heavy snow. That's the weather.

“The climate is the average of this weather. For example, you can expect snow in the Northeast in January or hot and humid weather in the Southeast in July. This is climate. The climate record also includes extreme values ​​such as record temperatures or record rainfall. If you ever hear your local weather expert say: “Today we reached a record high for this day,” then he is talking about climate records.

“So when we talk about climate change, we're talking about changes in the long-term average of daily weather. In most places, the weather can change from minute to minute, hour to hour, day to day, and season to season. However, climate is the temporal and spatial average of the weather.”

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The climate report for the Atlanta area for the previous month shows how much the average temperatures differ this month. The average temperature for a date is the average over a 30 year period.

Date	Max	Min	Average	Deviation from the norm	precipitation
08/01/2024	94	74	84	2.8	0
08/02/2024	93	77	85	3.9	0.04
08/03/2024	91	74	82.5	1.4	0
08/04/2024	91	74	82.5	1.4	T
August 5, 2024	92	75	83.5	2.5	T
Aug 6, 2024	93	77	85	4	0
August 7, 2024	96	74	85	4.1	0
08/08/2024	96	77	86.5	5.6	0
Aug 9, 2024	95	76	85.5	4.7	0
08/10/2024	93	73	83	2.2	0
08/11/2024	92	69	80.5	-0.2	0
Aug 12, 2024	92	70	81	0.4	0
Aug 13, 2024	93	71	82	1.4	0
August 14, 2024	92	76	84	3.5	0
August 15, 2024	90	74	82	1.6	0
August 16, 2024	91	72	81.5	1.2	0.39
Aug 17, 2024	95	71	83	2.8	0.11
August 18, 2024	91	72	81.5	1.3	0.23
August 19, 2024	89	70	79.5	-0.6	0
Aug 20, 2024	89	70	79.5	-0.5	0
August 21, 2024	85	67	76	-3.8	0
08/22/2024	85	69	77	-2.7	0
August 23, 2024	85	65	75	-4.6	0
Aug 24, 2024	88	66	77	-2.5	0
Aug 25, 2024	90	69	79.5	0.1	0
August 26, 2024	92	70	81	1.8	0
August 27, 2024	94	71	82.5	3.4	0
August 28, 2024	97	74	85.5	6.5	0
August 29, 2024	98	76	87	8.2	0
August 30, 2024	96	75	85.5	6.8	0.03
August 31, 2024	M	M	M	M	M

Climate Almanac for the Atlanta Metropolitan Area

This almanac provides information about past climate conditions for September 30 and allows comparisons with current weather.

Daily data	Observed	Normal	Record highest record	Record low
Maximum temperature	M	80	96 in 2019	56 in 1920
Min. temperature	M	61	74 in 2019	36 in 1967
Average temperature	M	70.6	85.0 in 2019	49.5 in 1920
precipitation	M	0.14	4.23 in 1989	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	1	15 in 1920	0 in 2023
CDD (Base 65)	M	6	20 in 2019	0 in 2020
Summary of the current month	Observed	Normal	Record highest record	Record low
Average maximum temperature	84.5	83.9	93.2 in 2019	75.2 in 1924
Average minimum temperature	68.2	65.9	73.2 in 1925	57.0 in 1967
Average temperature	76.4	74.9	83.0 in 1925	66.5 in 1967
Total precipitation	12.29	3.82	14.26 in 1888	0.04 in 1984
Total snowfall	0.0	0.0	0.0 in 2024	0.0 in 2024
Maximum snow depth	0	–	0 in 2024	0 in 2024
Entire Hard Drive (Base 65)	0	5	52 in 1967	0 in 2024
Total CDD (Base 65)	337	302	546 in 1925	103 in 1967
Summary of the current year	Observed	Normal	Record highest record	Record low
Average maximum temperature	78.1	76.0	78.6 in 2019	70.1 in 1885
Average minimum temperature	59.4	56.9	59.7 in 2019	51.1 in 1940
Average temperature	68.7	66.4	69.2 in 2019	61.5 in 1940
Total precipitation	55.83	38.60	56.81 in 1920	22.56 in 1931
Total snowfall (since July 1st)	0.0	0.0	T in 2001	0.0 in 2024
Maximum snow depth (since July 1st)	0	–	T in 1942	0 in 2024
Total HDD (since July 1st)	0	5	52 in 1967	0 in 2024
Total CDD (since January 1st)	2329	1951	2477 in 2019	1149 in 1967

Recording period:

• Maximum temperature: October 4, 1878 to September 29, 2024
• Minimum temperature: October 4, 1878 to September 29, 2024
• Precipitation: 1878-10-01 to 2024-09-29
• Snowfall: 1928-12-25 to 2024-09-28
• Snow depth: 1928-12-25 to 2024-09-27

For more information about our region's climate, see the NWS Atlanta Region Climate FAQ.

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 warnings for the United States, its territories, adjacent waters and marine areas to protect life and property and strengthen the national economy.

“These services include forecasts and observations, warnings, impact-based decision support services and education to build a weather-ready nation. “The ultimate goal is a society that is prepared for and responsive to weather, water and climate events.”