Cobb County (Marietta)
September
Weather in Cobb County, Georgia for September 2026
Your guide to Cobb County weather in September - trends and predictions
So far, September 2026 in Cobb County shows a warmer trend than usual by 2.6 °F.
The forecast for the next days in Cobb County predicts temperatures to be around 28 °F, close to the historical average.
In general, the average temperature in Cobb County at the beginning of September is 32.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.3 °F by the end of September.
Cobb County experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 63.2 mm.
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Temperatures
Rain 🌧️
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23
Dry days
7
Rainy days
0
Snow days
29°/21°
Temperatures
12 km/h
Avg max wind
62 %
Avg humidity
Cobb County Weather September
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Temperatures trend during September in Cobb County
See the weather trend as well as the moving average line
September weather in Cobb County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Cloudy | 31° /20° | 0 mm | 9 | |
| Sept. 2 |  Partly cloudy | 32° /20° | 0 mm | 10 | |
| Sept. 3 |  Overcast | 33° /21° | 0 mm | 10 | |
| Sept. 4 |  Moderate rain at times | 35° /22° | 1.5 mm | 10 | |
| Sept. 5 | Cloudy | 35° /22° | 4 mm | 10 | |
| Sept. 6 |  Thundery outbreaks possible | 34° /22° | 0 mm | 8 | |
| Sept. 7 | Overcast | 28° /20° | 0 mm | 7 | |
| Sept. 8 | Overcast | 28° /19° | 0 mm | 6 | |
| Sept. 9 | Cloudy | 29° /19° | 0 mm | 8 | |
| Sept. 10 |  Sunny | 31° /19° | 0.2 mm | 10 | |
| Sept. 11 | Sunny | 31° /19° | 5.7 mm | 9 | |
| Sept. 12 | Partly cloudy | 29° /21° | 249.8 mm | 6 | |
| Sept. 13 | Overcast | 30° /22° | 0.2 mm | 8 | |
| Sept. 14 | Overcast | 33° /21° | 0 mm | 9 | |
| Sept. 15 | Overcast | 30° /22° | 0.8 mm | 7 | |
| Sept. 16 | Partly cloudy | 31° /21° | 0.4 mm | 9 | |
| Sept. 17 | Moderate rain at times | 30° /20° | 3.1 mm | 9 | |
| Sept. 18 | Sunny | 35° /24° | 0.2 mm | 8.2 | |
| Sept. 19 | Overcast | 31° /22° | 10.3 mm | 5.9 | |
| Sept. 20 | Overcast | 28° /21° | 5.2 mm | 5.5 | |
| Sept. 21 | Overcast | 31° /22° | 1.3 mm | 7 | |
| Sept. 22 |  Light rain shower | 29° /21° | 3.5 mm | 6 | |
| Sept. 23 | Patchy rain possible | 31° /22° | 2.2 mm | 7 | |
| Sept. 24 | Overcast | 31° /22° | 0 mm | 8 | |
| Sept. 25 | Sunny | 25° /17° | 0 mm | 7 | |
| Sept. 26 | Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 27 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 28 | Partly cloudy | 24° /14° | 0 mm | 6 | |
| Sept. 29 | Sunny | 28° /17° | 0 mm | 7 | |
| Sept. 30 | Sunny | 30° /19° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Cobb County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cobb County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Cobb County in September - FAQ
What are the expected maximum and minimum temperatures in Cobb County during September?
During September, expect a variety of temperatures with highs around 29° and lows near 21°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cobb County during September?
Moderate rainfall is anticipated in Cobb County during September, with a total of 63.2 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Cobb County during September?
The average wind speed in Cobb County during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Cobb County
Explore the daily rainfall trends and prepare for Cobb Countys September weather 💧
Typically, Cobb County has 7 rainy days in September with a total of 63.2 mm of rainfall.
UV exposure in Cobb County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Cobb County?Get accurate weather forecasts for Cobb County, located at latitude 33.953 and longitude -84.55. Stay updated with localized weather information tailored for Cobb County.
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