Click on a day for an hourly weather forecast
The temperatures in Upper Marlboro in September are comfortable with low of 18°C and and high up to 26°C.
You can expect about 3 to 8 days of rain in Upper Marlboro 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 Upper Marlboro in September 2025.
If you’re planning to visit Upper Marlboro in the near future, we highly recommend that you review the 14 day weather forecast for Upper Marlboro before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -2° | 6 | 19 | 6 | 104 mm | Awful | Upper Marlboro in January |
| February | 7° / 0° | 7 | 15 | 6 | 120 mm | Awful | Upper Marlboro in February |
| March | 12° / 4° | 7 | 20 | 4 | 122 mm | Awful | Upper Marlboro in March |
| April | 18° / 9° | 8 | 22 | 0 | 130 mm | Ok | Upper Marlboro in April |
| May | 23° / 14° | 8 | 23 | 0 | 156 mm | Good | Upper Marlboro in May |
| June | 28° / 19° | 7 | 23 | 0 | 154 mm | Good | Upper Marlboro in June |
| July | 31° / 22° | 8 | 23 | 0 | 184 mm | Ok | Upper Marlboro in July |
| August | 30° / 21° | 8 | 23 | 0 | 178 mm | Ok | Upper Marlboro in August |
| September | 26° / 18° | 5 | 25 | 0 | 143 mm | Perfect | Upper Marlboro in September |
| October | 20° / 12° | 5 | 26 | 0 | 151 mm | Good | Upper Marlboro in October |
| November | 13° / 6° | 5 | 24 | 1 | 95 mm | Ok | Upper Marlboro in November |
| December | 8° / 2° | 7 | 21 | 3 | 136 mm | Awful | Upper Marlboro in December |