Gwinnett County (Lawrenceville)
September
Weather in Gwinnett County, Georgia for September 2026
Your guide to Gwinnett County weather in September - trends and predictions
In general, the average temperature in Gwinnett County at the beginning of September is 28.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 27 °F by the end of September.
Gwinnett County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 42.6 mm.
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Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
28°/20°
Temperatures
12 km/h
Avg max wind
65 %
Avg humidity
Gwinnett County Weather September
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Temperatures trend during September in Gwinnett County
See the weather trend as well as the moving average line
September weather in Gwinnett County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 24° /18° | 0 mm | 6 | |
| Sept. 2 |  Partly cloudy | 27° /18° | 0 mm | 10 | |
| Sept. 3 | Partly cloudy | 27° /17° | 0 mm | 10 | |
| Sept. 4 | Partly cloudy | 31° /21° | 0 mm | 10 | |
| Sept. 5 | Partly cloudy | 31° /22° | 0 mm | 10 | |
| Sept. 6 |  Thundery outbreaks possible | 31° /25° | 0 mm | 6 | |
| Sept. 7 |  Mist | 28° /20° | 0 mm | 10 | |
| Sept. 8 | Overcast | 23° /18° | 0 mm | 4 | |
| Sept. 9 | Overcast | 25° /18° | 0 mm | 6 | |
| Sept. 10 |  Cloudy | 26° /17° | 0 mm | 9 | |
| Sept. 11 | Partly cloudy | 28° /18° | 0 mm | 9 | |
| Sept. 12 | Cloudy | 27° /20° | 0 mm | 9 | |
| Sept. 13 | Partly cloudy | 28° /19° | 0 mm | 9 | |
| Sept. 14 | Mist | 30° /18° | 0 mm | 8 | |
| Sept. 15 | Overcast | 27° /21° | 0 mm | 5 | |
| Sept. 16 | Partly cloudy | 28° /20° | 0 mm | 9 | |
| Sept. 17 |  Moderate rain at times | 28° /18° | 4.8 mm | 9 | |
| Sept. 18 | Partly cloudy | 28° /19° | 0 mm | 8 | |
| Sept. 19 | Thundery outbreaks possible | 29° /21° | 2.2 mm | 7 | |
| Sept. 20 | Thundery outbreaks possible | 29° /22° | 3 mm | 8 | |
| Sept. 21 | Overcast | 28° /21° | 0 mm | 8 | |
| Sept. 22 | Cloudy | 31° /20° | 0 mm | 8 | |
| Sept. 23 | Cloudy | 31° /19° | 0 mm | 8 | |
| Sept. 24 | Overcast | 30° /22° | 0 mm | 7 | |
| Sept. 25 | Moderate or heavy rain shower | 26° /22° | 16.6 mm | 2 | |
| Sept. 26 |  Light rain shower | 28° /21° | 12.1 mm | 3 | |
| Sept. 27 | Fog | 26° /21° | 3.9 mm | 3 | |
| Sept. 28 | Mist | 28° /19° | 0 mm | 5 | |
| Sept. 29 | Cloudy | 28° /20° | 0 mm | 7 | |
| Sept. 30 | Overcast | 23° /19° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Gwinnett 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 Gwinnett County forecast closer to your planned date for the most up-to-date weather information.
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Gwinnett County in September - FAQ
What are the expected maximum and minimum temperatures in Gwinnett County during September?
During September, expect a variety of temperatures with highs around 28° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Gwinnett County during September?
In September, Gwinnett County can expect light to moderate rainfall, totaling 42.6 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Gwinnett County during September?
The average wind speed in Gwinnett County during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Gwinnett County
Explore the daily rainfall trends and prepare for Gwinnett Countys September weather 💧
Typically, Gwinnett County has 6 rainy days in September with a total of 42.6 mm of rainfall.
UV exposure in Gwinnett County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Gwinnett County?Get accurate weather forecasts for Gwinnett County, located at latitude 33.956 and longitude -83.988. Stay updated with localized weather information tailored for Gwinnett County.
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