Click on a day for an hourly weather forecast
The temperatures in Marietta in September are comfortable with low of 19°C and and high up to 29°C.
You can expect about 3 to 8 days of rain in Marietta during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Marietta in September 2025.
If you’re planning to visit Marietta in the near future, we highly recommend that you review the 14 day weather forecast for Marietta before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 10° / 2° | 6 | 24 | 2 | 74 mm | Bad | Marietta in January |
| February | 13° / 4° | 6 | 21 | 1 | 92 mm | Ok | Marietta in February |
| March | 18° / 8° | 7 | 23 | 1 | 94 mm | Ok | Marietta in March |
| April | 23° / 12° | 5 | 25 | 0 | 108 mm | Perfect | Marietta in April |
| May | 27° / 16° | 7 | 24 | 0 | 129 mm | Good | Marietta in May |
| June | 31° / 20° | 8 | 22 | 0 | 138 mm | Ok | Marietta in June |
| July | 33° / 22° | 8 | 23 | 0 | 176 mm | Ok | Marietta in July |
| August | 32° / 22° | 7 | 24 | 0 | 168 mm | Ok | Marietta in August |
| September | 29° / 19° | 6 | 24 | 0 | 125 mm | Good | Marietta in September |
| October | 24° / 13° | 4 | 27 | 0 | 73 mm | Perfect | Marietta in October |
| November | 17° / 7° | 4 | 26 | 0 | 73 mm | Good | Marietta in November |
| December | 13° / 5° | 6 | 24 | 1 | 96 mm | Ok | Marietta in December |